python项目2--【数据可视化】之下载数据
目录
python项目2--【数据可视化】之下载数据
本章将从网上下载数据，并对其进行可视化。网上的数据多得令人难以置信，大多未经仔细检查。如果能够对这些数据进行分析，就能发现别人没有发现的规律。
本章将访问并可视化的数据以两种常见格式存储：CSV和JSON。我们将使用Python模块csv来处理以CSV格式存储的天气数据，找出两个地区在一段时间内的最高温度和最低温度。然后，使用Matplotlib根据下载的数据创建一个图标，展示两个不同地区的温度变化：阿拉斯加州锡特卡和加利福利亚死亡谷。然后，使用模块json访问以JSON格式存储的地震数据，并使用Plotly绘制一幅散点图，展示这些地震的位置和震级。
阅读本章后，将能够处理各种类型和格式的数据集，并对如何创建复杂的图表有深入的认识。要处理各种真实的数据集，必须能够访问并可视化各种类型和格式的在线数据。
一、CSV文件格式
要在文本文件中存储数据，一个简单方式是将数据作为一系列以逗号分隔的值（comma-separated values）写入文件。这样的文件称为CSV文件。例如，下面是一行CSV格式的天气数据。
"USWOOO25333", "sitka airport, AK US", "2018-01-01", "0.45", "48", "38"
这是阿拉斯加州锡特卡2018年1月1日的天气数据，其中包含当天的最高温度和最低温度，还有众多其他的数据。CSV文件对人来说阅读起来比较麻烦。但程序可轻松提取并处理其中的值。有助于加快数据分析过程。
我们将首先处理少量CSV格式的锡特卡天气数据，这些数据可在（ituring.cn/book/2784）中找到。请将文件sitka_weather_07-2018_simple.csv复制到存储本章程序的文件夹中。
文件内容如下：
"STATION","NAME","DATE","PRCP","TAVG","TMAX","TMIN"
"USW00025333","SITKA AIRPORT, AK US","2018-07-01","0.25",,"62","50"
"USW00025333","SITKA AIRPORT, AK US","2018-07-02","0.01",,"58","53"
"USW00025333","SITKA AIRPORT, AK US","2018-07-03","0.00",,"70","54"
"USW00025333","SITKA AIRPORT, AK US","2018-07-04","0.00",,"70","55"
"USW00025333","SITKA AIRPORT, AK US","2018-07-05","0.00",,"67","55"
"USW00025333","SITKA AIRPORT, AK US","2018-07-06","0.00",,"59","55"
"USW00025333","SITKA AIRPORT, AK US","2018-07-07","0.00",,"58","55"
"USW00025333","SITKA AIRPORT, AK US","2018-07-08","0.00",,"62","54"
"USW00025333","SITKA AIRPORT, AK US","2018-07-09","0.00",,"66","55"
"USW00025333","SITKA AIRPORT, AK US","2018-07-10","0.44",,"59","53"
"USW00025333","SITKA AIRPORT, AK US","2018-07-11","0.29",,"56","50"
"USW00025333","SITKA AIRPORT, AK US","2018-07-12","0.02",,"63","49"
"USW00025333","SITKA AIRPORT, AK US","2018-07-13","0.00",,"65","48"
"USW00025333","SITKA AIRPORT, AK US","2018-07-14","0.32",,"58","52"
"USW00025333","SITKA AIRPORT, AK US","2018-07-15","0.75",,"56","52"
"USW00025333","SITKA AIRPORT, AK US","2018-07-16","0.61",,"59","52"
"USW00025333","SITKA AIRPORT, AK US","2018-07-17","0.00",,"64","52"
"USW00025333","SITKA AIRPORT, AK US","2018-07-18","0.16",,"60","53"
"USW00025333","SITKA AIRPORT, AK US","2018-07-19","0.14",,"60","53"
"USW00025333","SITKA AIRPORT, AK US","2018-07-20","0.00",,"61","56"
"USW00025333","SITKA AIRPORT, AK US","2018-07-21","0.00",,"65","55"
"USW00025333","SITKA AIRPORT, AK US","2018-07-22","0.00",,"65","54"
"USW00025333","SITKA AIRPORT, AK US","2018-07-23","0.00",,"63","54"
"USW00025333","SITKA AIRPORT, AK US","2018-07-24","0.00",,"59","52"
"USW00025333","SITKA AIRPORT, AK US","2018-07-25","0.00",,"64","52"
"USW00025333","SITKA AIRPORT, AK US","2018-07-26","0.00",,"65","58"
"USW00025333","SITKA AIRPORT, AK US","2018-07-27","0.00",,"68","58"
"USW00025333","SITKA AIRPORT, AK US","2018-07-28","0.00",,"66","56"
"USW00025333","SITKA AIRPORT, AK US","2018-07-29","0.00",,"64","56"
"USW00025333","SITKA AIRPORT, AK US","2018-07-30","0.00",,"67","58"
"USW00025333","SITKA AIRPORT, AK US","2018-07-31","0.00",,"65","56"
1. 分析CSV文件头
csv模块包含在Python标准库中，可用于分析CSV文件中的数据行，让我们能够快速提取感兴趣的值。先来查看这个文件的第一行，其中的一系列文件头指出了后续各行包含的是什么样的信息：
导入模块csv后，将要使用的文件的名称赋给filename。接下来，打开这个文件，并将返回的文件对象赋给f。然后，调用csv.reader()并将前面存储的文件对象作为实参传递给它，从而创建一个与该文件相关联的阅读器对象。这个阅读器对象被赋给了reader。
模块csv包含函数next()，调用它并传入阅读器对象时，它将返回文件中的下一行。在上述代码中，只调用了next()一次，因此得到的是文件的第一行，其中包含文件头。将返回的数据存储到header_row中，如你所见，header_row包含与天气相关的文件头，指出了每行都包含哪些数据。
reader处理文件中以逗号分隔的第一行数据，并将没想数据都作为一个元素存储在列表中。文件头STATION表示记录数据的气象站的编码。这个文件头的位置表明，每行的第一个值都是气象站编码。文件头NAME指出每行的第二个值都是记录数据的气象站名称。其他文件头则指出记录了哪些信息。当前，我们最关心的是日期(DATE)、最高温度(TMAX)和最低温度(TMIN)。这是一个简单的数据集，只包含降水量以及与温度相关的数据。你自己下载天气数据时，可选择涵盖众多测量值，如风速、风向以及详细的降水量数据。
2. 打印文件头及其位置
为了让文件头数据更容易理解，将列表中的每个文件头及其位置打印出来：
在循环中，对俩表调用了enumerate()来获取每个元素的索引及其值。（请注意，我们删除了代码行print(header_row)，转而显示这个更详细的版本）。
输出如下，指出了每个文件头的索引：
从中可知，日期和最高温度分别存储在第三列和第六列。为研究这些数据，我们将处理sitka_weather_07-2018_simple.csv中的每行数据，并提取其中索引为2和5的值。
3. 提取并读取数据
知道需要哪些列中的数据后，我们来读取一些数据。首先，读取每天的最高温度：
创建一个名为highs的空列表，再遍历文件中余下的各行。阅读器对象从其停留的地方继续往下读取CSV文件，每次都自动返回当前所处位置的下一行。由于已经读取了文件头行，这个循环将从第二行开始——从这行开始包含的是实际数据。每次执行循环时，都将索引5处（TMAX列）的数据附加到highs末尾。在文件中，这项数据是以字符串格式存储的，因此在附加到highs末尾前，使用函数int()将其转换为数值格式，以便使用。
highs现在存储的数据如下：
提取每天的最高温度并将其存储到列表中之后，就可以可视化这些数据了。
4. 绘制温度图表
为可视化这些温度数据，首先使用Matplotlib创建一个显示每日最高温度的简单图形，如下所示：
将最高温度列表传给plot()，并传递c='red'以便将数据点绘制为红色。（这里使用红色显示最高温度，用蓝色显示最低温度。）接下来，设置了一些其他的格式，如名称和字号，这些都在之前的博客中介绍过。鉴于还没有添加日期，因此没有给x轴添加标签，但ax.set_xlabel()确实修改了字号，让默认标签更容易看清。下图显示了绘制的图表：一个简单的折线图，显示了阿拉斯加州锡特卡2018年7月的每日最高温度。
5. 模块datetime
下面在图表中添加日期，使其更有用。在天气数据文件中，第一个日期在第二行：
"USW00025333","SITKA AIRPORT, AK US","2018-07-01","0.25",,"62","50"
读取该数据时，获得的是一个字符串，因此需要想办法将字符串"2018-07-01"转换为一个表示相应日期的对象。为创建一个表示2018年7月1日的对象，可使用模块datetime中的方法strptime()。我们在终端会话中看看strptime()的工作原理：
首先导入模块datetime，再调用方法strptime()，并将包含所需日期的字符串作为第一个实参。第二个实参告诉Python如何设置日期的格式。在这里，%Y让Python将字符串中第一个连字符前面的部分视为四位的年份，%m让Python将第二个连字符前面的部分视为表示月份的数，%d让Python将字符串的最后一部分视为月份中的一天(1~31)。
方法stratime()可接受各种实参，并根据它们来决定如何解读日期。下面列出了这样的一些实参。
| 实参 | 含义 |
|---|---|
| %A | 星期几，如Monday |
| %B | 月份名，如January |
| %m | 用数表示的月份（01~12） |
| %d | 用书表示的月份中的一天（01~31） |
| %Y | 四位的年份，如2022 |
| %y | 两位的年份，如22 |
| %H | 24小时制的小时数（00-23） |
| %I | 12小时制的小时数（01~12） |
| %p | am或pm |
| %M | 分钟数（00~59） |
| %S | 秒数（00~61） |
6. 在图表中添加日期
现在，可以通过提取日期和最高温度并将其传递给plot()，对温度图形进行改进，如下所示：
我们创建了两个空列表，用于存储从文件中提取的日期和最高温度。然后，将包含日期信息的数据(row[0])转换为datetime对象，并将其附加到列表dates末尾。然后，将日期和最高温度值传递给plot()。最后，调用fig.autofmt_xdate()来绘制倾斜的日期标签，以免彼此重叠。下图显示了改进后的图表。
7. 涵盖更长的时间
设置好图表后，我们来添加更多的数据，生成一幅更复杂的锡特卡天气图。请将以下内容编辑到文件sitka_weather_2018_simple.csv并保存到本章程序所在的文件夹，该文件包含整年的锡特卡天气数据。
"STATION","NAME","DATE","PRCP","TMAX","TMIN","TOBS"
"USC00042319","DEATH VALLEY, CA US","2018-01-01","0.00","65","34","42"
"USC00042319","DEATH VALLEY, CA US","2018-01-02","0.00","61","38","46"
"USC00042319","DEATH VALLEY, CA US","2018-01-03","0.00","69","34","54"
"USC00042319","DEATH VALLEY, CA US","2018-01-04","0.00","69","39","48"
"USC00042319","DEATH VALLEY, CA US","2018-01-05","0.00","74","40","57"
"USC00042319","DEATH VALLEY, CA US","2018-01-06","0.00","74","47","65"
"USC00042319","DEATH VALLEY, CA US","2018-01-07","0.00","77","54","60"
"USC00042319","DEATH VALLEY, CA US","2018-01-08","0.07","62","52","52"
"USC00042319","DEATH VALLEY, CA US","2018-01-09","0.40","60","51","51"
"USC00042319","DEATH VALLEY, CA US","2018-01-10","0.00","64","49","50"
"USC00042319","DEATH VALLEY, CA US","2018-01-11","0.00","67","45","51"
"USC00042319","DEATH VALLEY, CA US","2018-01-12","0.00","68","44","51"
"USC00042319","DEATH VALLEY, CA US","2018-01-13","0.00","73","45","55"
"USC00042319","DEATH VALLEY, CA US","2018-01-14","0.00","72","44","55"
"USC00042319","DEATH VALLEY, CA US","2018-01-15","0.00","73","46","55"
"USC00042319","DEATH VALLEY, CA US","2018-01-16","0.00","70","49","54"
"USC00042319","DEATH VALLEY, CA US","2018-01-17","0.00","71","47","54"
"USC00042319","DEATH VALLEY, CA US","2018-01-18","0.00","71","46","53"
"USC00042319","DEATH VALLEY, CA US","2018-01-19","0.01","78","48","56"
"USC00042319","DEATH VALLEY, CA US","2018-01-20","0.00","68","54","56"
"USC00042319","DEATH VALLEY, CA US","2018-01-21","0.00","69","46","47"
"USC00042319","DEATH VALLEY, CA US","2018-01-22","0.00","66","39","45"
"USC00042319","DEATH VALLEY, CA US","2018-01-23","0.00","69","37","46"
"USC00042319","DEATH VALLEY, CA US","2018-01-24","0.00","69","37","47"
"USC00042319","DEATH VALLEY, CA US","2018-01-25","0.00","75","42","52"
"USC00042319","DEATH VALLEY, CA US","2018-01-26","0.00","69","42","53"
"USC00042319","DEATH VALLEY, CA US","2018-01-27","0.00","69","38","50"
"USC00042319","DEATH VALLEY, CA US","2018-01-28","0.00","81","44","56"
"USC00042319","DEATH VALLEY, CA US","2018-01-29","0.00","81","48","61"
"USC00042319","DEATH VALLEY, CA US","2018-01-30","0.00","79","48","60"
"USC00042319","DEATH VALLEY, CA US","2018-01-31","0.00","78","44","53"
"USC00042319","DEATH VALLEY, CA US","2018-02-01","0.00","79","45","52"
"USC00042319","DEATH VALLEY, CA US","2018-02-02","0.00","81","45","59"
"USC00042319","DEATH VALLEY, CA US","2018-02-03","0.00","81","46","59"
"USC00042319","DEATH VALLEY, CA US","2018-02-04","0.00","87","57","61"
"USC00042319","DEATH VALLEY, CA US","2018-02-05","0.00","85","47","63"
"USC00042319","DEATH VALLEY, CA US","2018-02-06","0.00","88","51","70"
"USC00042319","DEATH VALLEY, CA US","2018-02-07","0.00","83","53","60"
"USC00042319","DEATH VALLEY, CA US","2018-02-08","0.00","85","48","57"
"USC00042319","DEATH VALLEY, CA US","2018-02-09","0.00","82","46","55"
"USC00042319","DEATH VALLEY, CA US","2018-02-10","0.00","82","48","62"
"USC00042319","DEATH VALLEY, CA US","2018-02-11","0.00","73","49","56"
"USC00042319","DEATH VALLEY, CA US","2018-02-12","0.00","70","47","57"
"USC00042319","DEATH VALLEY, CA US","2018-02-13","0.00","72","54","57"
"USC00042319","DEATH VALLEY, CA US","2018-02-14","0.00","74","50","58"
"USC00042319","DEATH VALLEY, CA US","2018-02-15","0.00","76","48","63"
"USC00042319","DEATH VALLEY, CA US","2018-02-16","0.00","76","53","56"
"USC00042319","DEATH VALLEY, CA US","2018-02-17","0.00","76","42","55"
"USC00042319","DEATH VALLEY, CA US","2018-02-18","0.00","","",""
"USC00042319","DEATH VALLEY, CA US","2018-02-19","0.00","66","46","46"
"USC00042319","DEATH VALLEY, CA US","2018-02-20","0.00","62","38","45"
"USC00042319","DEATH VALLEY, CA US","2018-02-21","0.00","65","39","48"
"USC00042319","DEATH VALLEY, CA US","2018-02-22","0.00","67","37","49"
"USC00042319","DEATH VALLEY, CA US","2018-02-23","0.00","64","40","43"
"USC00042319","DEATH VALLEY, CA US","2018-02-24","0.00","60","38","45"
"USC00042319","DEATH VALLEY, CA US","2018-02-25","0.00","70","42","47"
"USC00042319","DEATH VALLEY, CA US","2018-02-26","0.05","69","36","62"
"USC00042319","DEATH VALLEY, CA US","2018-02-27","0.00","62","44","45"
"USC00042319","DEATH VALLEY, CA US","2018-02-28","0.00","69","38","53"
"USC00042319","DEATH VALLEY, CA US","2018-03-01","0.00","77","47","62"
"USC00042319","DEATH VALLEY, CA US","2018-03-02","0.00","77","61","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-03","0.00","73","52","53"
"USC00042319","DEATH VALLEY, CA US","2018-03-04","0.00","70","44","52"
"USC00042319","DEATH VALLEY, CA US","2018-03-05","0.00","72","47","53"
"USC00042319","DEATH VALLEY, CA US","2018-03-06","0.00","79","48","59"
"USC00042319","DEATH VALLEY, CA US","2018-03-07","0.00","75","48","50"
"USC00042319","DEATH VALLEY, CA US","2018-03-08","0.00","80","41","60"
"USC00042319","DEATH VALLEY, CA US","2018-03-09","0.00","83","48","63"
"USC00042319","DEATH VALLEY, CA US","2018-03-10","0.04","80","58","59"
"USC00042319","DEATH VALLEY, CA US","2018-03-11","0.08","82","58","67"
"USC00042319","DEATH VALLEY, CA US","2018-03-12","0.00","85","58","72"
"USC00042319","DEATH VALLEY, CA US","2018-03-13","0.00","90","59","75"
"USC00042319","DEATH VALLEY, CA US","2018-03-14","0.00","80","64","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-15","0.00","77","56","64"
"USC00042319","DEATH VALLEY, CA US","2018-03-16","0.00","77","55","63"
"USC00042319","DEATH VALLEY, CA US","2018-03-17","0.00","73","55","60"
"USC00042319","DEATH VALLEY, CA US","2018-03-18","0.00","74","47","61"
"USC00042319","DEATH VALLEY, CA US","2018-03-19","0.00","81","49","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-20","0.00","79","52","68"
"USC00042319","DEATH VALLEY, CA US","2018-03-21","0.00","83","58","72"
"USC00042319","DEATH VALLEY, CA US","2018-03-22","0.03","79","66","67"
"USC00042319","DEATH VALLEY, CA US","2018-03-23","0.00","84","59","67"
"USC00042319","DEATH VALLEY, CA US","2018-03-24","0.00","81","63","63"
"USC00042319","DEATH VALLEY, CA US","2018-03-25","0.00","79","57","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-26","0.00","79","56","64"
"USC00042319","DEATH VALLEY, CA US","2018-03-27","0.00","84","59","75"
"USC00042319","DEATH VALLEY, CA US","2018-03-28","0.00","94","70","75"
"USC00042319","DEATH VALLEY, CA US","2018-03-29","0.00","96","68","83"
"USC00042319","DEATH VALLEY, CA US","2018-03-30","0.00","97","68","78"
"USC00042319","DEATH VALLEY, CA US","2018-03-31","0.00","99","65","84"
"USC00042319","DEATH VALLEY, CA US","2018-04-01","0.00","97","66","81"
"USC00042319","DEATH VALLEY, CA US","2018-04-02","0.00","90","69","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-03","0.00","93","72","74"
"USC00042319","DEATH VALLEY, CA US","2018-04-04","0.00","95","61","76"
"USC00042319","DEATH VALLEY, CA US","2018-04-05","0.00","96","70","85"
"USC00042319","DEATH VALLEY, CA US","2018-04-06","0.00","98","76","83"
"USC00042319","DEATH VALLEY, CA US","2018-04-07","0.00","100","77","79"
"USC00042319","DEATH VALLEY, CA US","2018-04-08","0.00","96","65","76"
"USC00042319","DEATH VALLEY, CA US","2018-04-09","0.00","97","69","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-10","0.00","104","64","91"
"USC00042319","DEATH VALLEY, CA US","2018-04-11","0.00","103","80","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-12","0.00","83","67","68"
"USC00042319","DEATH VALLEY, CA US","2018-04-13","0.00","86","59","69"
"USC00042319","DEATH VALLEY, CA US","2018-04-14","0.00","91","64","75"
"USC00042319","DEATH VALLEY, CA US","2018-04-15","0.00","95","64","77"
"USC00042319","DEATH VALLEY, CA US","2018-04-16","0.00","82","59","59"
"USC00042319","DEATH VALLEY, CA US","2018-04-17","0.00","79","54","66"
"USC00042319","DEATH VALLEY, CA US","2018-04-18","0.00","87","54","74"
"USC00042319","DEATH VALLEY, CA US","2018-04-19","0.00","78","62","67"
"USC00042319","DEATH VALLEY, CA US","2018-04-20","0.00","95","59","76"
"USC00042319","DEATH VALLEY, CA US","2018-04-21","0.00","99","67","81"
"USC00042319","DEATH VALLEY, CA US","2018-04-22","0.00","103","68","87"
"USC00042319","DEATH VALLEY, CA US","2018-04-23","0.00","104","76","83"
"USC00042319","DEATH VALLEY, CA US","2018-04-24","0.00","105","73","87"
"USC00042319","DEATH VALLEY, CA US","2018-04-25","0.00","106","70","85"
"USC00042319","DEATH VALLEY, CA US","2018-04-26","0.00","108","73","90"
"USC00042319","DEATH VALLEY, CA US","2018-04-27","0.00","104","80","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-28","0.00","95","70","79"
"USC00042319","DEATH VALLEY, CA US","2018-04-29","0.00","95","71","74"
"USC00042319","DEATH VALLEY, CA US","2018-04-30","0.00","85","65","73"
"USC00042319","DEATH VALLEY, CA US","2018-05-01","0.00","84","60","60"
"USC00042319","DEATH VALLEY, CA US","2018-05-02","0.00","82","59","73"
"USC00042319","DEATH VALLEY, CA US","2018-05-03","0.00","97","63","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-04","0.00","102","66","87"
"USC00042319","DEATH VALLEY, CA US","2018-05-05","0.00","105","72","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-06","0.00","110","77","92"
"USC00042319","DEATH VALLEY, CA US","2018-05-07","0.00","108","82","89"
"USC00042319","DEATH VALLEY, CA US","2018-05-08","0.00","109","77","96"
"USC00042319","DEATH VALLEY, CA US","2018-05-09","0.00","116","82","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-10","0.00","107","79","89"
"USC00042319","DEATH VALLEY, CA US","2018-05-11","0.00","104","78","78"
"USC00042319","DEATH VALLEY, CA US","2018-05-12","0.00","94","69","77"
"USC00042319","DEATH VALLEY, CA US","2018-05-13","0.00","95","71","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-14","0.00","97","74","80"
"USC00042319","DEATH VALLEY, CA US","2018-05-15","0.00","100","72","85"
"USC00042319","DEATH VALLEY, CA US","2018-05-16","0.00","101","79","80"
"USC00042319","DEATH VALLEY, CA US","2018-05-17","0.00","97","69","81"
"USC00042319","DEATH VALLEY, CA US","2018-05-18","0.00","102","75","88"
"USC00042319","DEATH VALLEY, CA US","2018-05-19","0.00","105","82","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-20","0.00","103","81","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-21","0.00","97","81","82"
"USC00042319","DEATH VALLEY, CA US","2018-05-22","0.00","100","76","86"
"USC00042319","DEATH VALLEY, CA US","2018-05-23","0.00","103","80","88"
"USC00042319","DEATH VALLEY, CA US","2018-05-24","0.00","104","83","89"
"USC00042319","DEATH VALLEY, CA US","2018-05-25","0.00","95","75","75"
"USC00042319","DEATH VALLEY, CA US","2018-05-26","0.00","94","70","76"
"USC00042319","DEATH VALLEY, CA US","2018-05-27","0.00","102","74","87"
"USC00042319","DEATH VALLEY, CA US","2018-05-28","0.00","108","79","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-29","0.00","111","84","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-30","0.00","110","89","90"
"USC00042319","DEATH VALLEY, CA US","2018-05-31","0.00","101","81","81"
"USC00042319","DEATH VALLEY, CA US","2018-06-01","0.00","107","71","83"
"USC00042319","DEATH VALLEY, CA US","2018-06-02","0.00","113","82","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-03","0.00","118","79","101"
"USC00042319","DEATH VALLEY, CA US","2018-06-04","0.00","117","87","98"
"USC00042319","DEATH VALLEY, CA US","2018-06-05","0.00","114","88","95"
"USC00042319","DEATH VALLEY, CA US","2018-06-06","0.00","109","88","90"
"USC00042319","DEATH VALLEY, CA US","2018-06-07","0.00","109","85","90"
"USC00042319","DEATH VALLEY, CA US","2018-06-08","0.00","111","81","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-09","0.00","113","88","90"
"USC00042319","DEATH VALLEY, CA US","2018-06-10","0.00","106","85","88"
"USC00042319","DEATH VALLEY, CA US","2018-06-11","0.00","113","78","95"
"USC00042319","DEATH VALLEY, CA US","2018-06-12","0.00","117","82","101"
"USC00042319","DEATH VALLEY, CA US","2018-06-13","0.00","119","95","98"
"USC00042319","DEATH VALLEY, CA US","2018-06-14","0.00","117","90","96"
"USC00042319","DEATH VALLEY, CA US","2018-06-15","0.00","112","92","92"
"USC00042319","DEATH VALLEY, CA US","2018-06-16","0.00","107","85","86"
"USC00042319","DEATH VALLEY, CA US","2018-06-17","0.00","101","78","82"
"USC00042319","DEATH VALLEY, CA US","2018-06-18","0.00","103","75","88"
"USC00042319","DEATH VALLEY, CA US","2018-06-19","0.00","111","79","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-20","0.00","118","87","101"
"USC00042319","DEATH VALLEY, CA US","2018-06-21","0.00","126","94","105"
"USC00042319","DEATH VALLEY, CA US","2018-06-22","0.00","121","96","100"
"USC00042319","DEATH VALLEY, CA US","2018-06-23","0.00","120","92","100"
"USC00042319","DEATH VALLEY, CA US","2018-06-24","0.00","119","92","102"
"USC00042319","DEATH VALLEY, CA US","2018-06-25","0.00","121","97","103"
"USC00042319","DEATH VALLEY, CA US","2018-06-26","0.00","120","96","102"
"USC00042319","DEATH VALLEY, CA US","2018-06-27","0.00","117","94","100"
"USC00042319","DEATH VALLEY, CA US","2018-06-28","0.00","116","89","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-29","0.00","111","86","97"
"USC00042319","DEATH VALLEY, CA US","2018-06-30","0.00","118","88","102"
"USC00042319","DEATH VALLEY, CA US","2018-07-01","0.00","118","89","102"
"USC00042319","DEATH VALLEY, CA US","2018-07-02","0.00","119","96","100"
"USC00042319","DEATH VALLEY, CA US","2018-07-03","0.00","117","94","96"
"USC00042319","DEATH VALLEY, CA US","2018-07-04","0.00","113","90","97"
"USC00042319","DEATH VALLEY, CA US","2018-07-05","0.00","117","89","95"
"USC00042319","DEATH VALLEY, CA US","2018-07-06","0.00","121","82","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-07","0.00","121","94","108"
"USC00042319","DEATH VALLEY, CA US","2018-07-08","0.00","126","96","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-09","0.03","121","103","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-10","0.01","114","94","97"
"USC00042319","DEATH VALLEY, CA US","2018-07-11","0.00","113","94","99"
"USC00042319","DEATH VALLEY, CA US","2018-07-12","0.01","115","86","94"
"USC00042319","DEATH VALLEY, CA US","2018-07-13","0.00","114","86","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-14","0.00","120","97","106"
"USC00042319","DEATH VALLEY, CA US","2018-07-15","0.00","120","99","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-16","0.00","124","96","108"
"USC00042319","DEATH VALLEY, CA US","2018-07-17","0.00","123","102","109"
"USC00042319","DEATH VALLEY, CA US","2018-07-18","0.00","120","103","109"
"USC00042319","DEATH VALLEY, CA US","2018-07-19","0.00","121","101","101"
"USC00042319","DEATH VALLEY, CA US","2018-07-20","0.00","120","93","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-21","0.00","115","96","103"
"USC00042319","DEATH VALLEY, CA US","2018-07-22","0.00","120","93","103"
"USC00042319","DEATH VALLEY, CA US","2018-07-23","0.00","125","96","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-24","0.00","127","95","111"
"USC00042319","DEATH VALLEY, CA US","2018-07-25","0.00","127","102","109"
"USC00042319","DEATH VALLEY, CA US","2018-07-26","0.00","127","100","110"
"USC00042319","DEATH VALLEY, CA US","2018-07-27","0.00","127","94","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-28","0.00","124","101","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-29","0.00","124","100","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-30","0.00","123","103","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-31","0.00","121","103","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-01","0.00","120","96","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-02","0.00","121","97","105"
"USC00042319","DEATH VALLEY, CA US","2018-08-03","0.00","120","98","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-04","0.00","119","97","101"
"USC00042319","DEATH VALLEY, CA US","2018-08-05","0.00","117","88","101"
"USC00042319","DEATH VALLEY, CA US","2018-08-06","0.00","119","85","95"
"USC00042319","DEATH VALLEY, CA US","2018-08-07","0.00","121","80","97"
"USC00042319","DEATH VALLEY, CA US","2018-08-08","0.00","122","85","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-09","0.00","122","90","106"
"USC00042319","DEATH VALLEY, CA US","2018-08-10","0.00","119","98","102"
"USC00042319","DEATH VALLEY, CA US","2018-08-11","0.00","119","97","102"
"USC00042319","DEATH VALLEY, CA US","2018-08-12","0.00","112","93","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-13","0.00","117","94","105"
"USC00042319","DEATH VALLEY, CA US","2018-08-14","0.00","118","95","102"
"USC00042319","DEATH VALLEY, CA US","2018-08-15","0.00","117","95","101"
"USC00042319","DEATH VALLEY, CA US","2018-08-16","0.00","117","95","100"
"USC00042319","DEATH VALLEY, CA US","2018-08-17","0.00","116","93","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-18","0.00","119","97","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-19","0.00","122","92","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-20","0.00","119","99","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-21","0.00","117","96","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-22","0.00","115","92","98"
"USC00042319","DEATH VALLEY, CA US","2018-08-23","0.00","115","91","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-24","0.00","113","88","98"
"USC00042319","DEATH VALLEY, CA US","2018-08-25","0.00","113","88","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-26","0.00","114","87","95"
"USC00042319","DEATH VALLEY, CA US","2018-08-27","0.00","111","86","94"
"USC00042319","DEATH VALLEY, CA US","2018-08-28","0.00","109","83","94"
"USC00042319","DEATH VALLEY, CA US","2018-08-29","0.00","112","88","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-30","0.00","113","91","95"
"USC00042319","DEATH VALLEY, CA US","2018-08-31","0.00","109","83","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-01","0.00","113","83","89"
"USC00042319","DEATH VALLEY, CA US","2018-09-02","0.00","113","78","101"
"USC00042319","DEATH VALLEY, CA US","2018-09-03","0.00","113","89","98"
"USC00042319","DEATH VALLEY, CA US","2018-09-04","0.00","112","87","95"
"USC00042319","DEATH VALLEY, CA US","2018-09-05","0.00","110","84","98"
"USC00042319","DEATH VALLEY, CA US","2018-09-06","0.00","114","82","98"
"USC00042319","DEATH VALLEY, CA US","2018-09-07","0.00","115","85","99"
"USC00042319","DEATH VALLEY, CA US","2018-09-08","0.00","120","83","99"
"USC00042319","DEATH VALLEY, CA US","2018-09-09","0.00","116","88","96"
"USC00042319","DEATH VALLEY, CA US","2018-09-10","0.00","111","87","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-11","0.00","109","84","93"
"USC00042319","DEATH VALLEY, CA US","2018-09-12","0.00","110","85","93"
"USC00042319","DEATH VALLEY, CA US","2018-09-13","0.00","107","78","91"
"USC00042319","DEATH VALLEY, CA US","2018-09-14","0.00","109","82","91"
"USC00042319","DEATH VALLEY, CA US","2018-09-15","0.00","107","84","88"
"USC00042319","DEATH VALLEY, CA US","2018-09-16","0.00","109","78","92"
"USC00042319","DEATH VALLEY, CA US","2018-09-17","0.00","108","76","92"
"USC00042319","DEATH VALLEY, CA US","2018-09-18","0.00","106","74","86"
"USC00042319","DEATH VALLEY, CA US","2018-09-19","0.00","108","71","84"
"USC00042319","DEATH VALLEY, CA US","2018-09-20","0.00","107","77","81"
"USC00042319","DEATH VALLEY, CA US","2018-09-21","0.00","109","71","86"
"USC00042319","DEATH VALLEY, CA US","2018-09-22","0.00","110","74","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-23","0.00","111","85","90"
"USC00042319","DEATH VALLEY, CA US","2018-09-24","0.00","108","77","89"
"USC00042319","DEATH VALLEY, CA US","2018-09-25","0.00","111","79","86"
"USC00042319","DEATH VALLEY, CA US","2018-09-26","0.00","109","78","85"
"USC00042319","DEATH VALLEY, CA US","2018-09-27","0.00","110","69","87"
"USC00042319","DEATH VALLEY, CA US","2018-09-28","0.00","110","70","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-29","0.00","105","86","88"
"USC00042319","DEATH VALLEY, CA US","2018-09-30","0.00","103","82","90"
"USC00042319","DEATH VALLEY, CA US","2018-10-01","0.00","104","86","89"
"USC00042319","DEATH VALLEY, CA US","2018-10-02","0.00","101","86","87"
"USC00042319","DEATH VALLEY, CA US","2018-10-03","0.00","96","81","81"
"USC00042319","DEATH VALLEY, CA US","2018-10-04","0.00","93","75","79"
"USC00042319","DEATH VALLEY, CA US","2018-10-05","0.00","95","73","83"
"USC00042319","DEATH VALLEY, CA US","2018-10-06","0.07","94","73","74"
"USC00042319","DEATH VALLEY, CA US","2018-10-07","0.00","87","72","76"
"USC00042319","DEATH VALLEY, CA US","2018-10-08","0.00","93","69","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-09","0.00","92","63","78"
"USC00042319","DEATH VALLEY, CA US","2018-10-10","0.00","91","68","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-11","0.00","91","70","79"
"USC00042319","DEATH VALLEY, CA US","2018-10-12","0.00","93","72","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-13","0.00","96","66","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-14","0.00","89","68","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-15","0.00","86","61","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-16","0.00","91","68","73"
"USC00042319","DEATH VALLEY, CA US","2018-10-17","0.00","90","58","69"
"USC00042319","DEATH VALLEY, CA US","2018-10-18","0.00","91","58","68"
"USC00042319","DEATH VALLEY, CA US","2018-10-19","0.00","96","56","80"
"USC00042319","DEATH VALLEY, CA US","2018-10-20","0.00","96","72","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-21","0.00","94","70","76"
"USC00042319","DEATH VALLEY, CA US","2018-10-22","0.00","95","69","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-23","0.00","97","64","79"
"USC00042319","DEATH VALLEY, CA US","2018-10-24","0.00","96","64","75"
"USC00042319","DEATH VALLEY, CA US","2018-10-25","0.00","96","63","73"
"USC00042319","DEATH VALLEY, CA US","2018-10-26","0.00","95","61","75"
"USC00042319","DEATH VALLEY, CA US","2018-10-27","0.00","94","59","71"
"USC00042319","DEATH VALLEY, CA US","2018-10-28","0.00","93","59","74"
"USC00042319","DEATH VALLEY, CA US","2018-10-29","0.00","94","59","80"
"USC00042319","DEATH VALLEY, CA US","2018-10-30","0.00","85","71","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-31","0.00","83","61","61"
"USC00042319","DEATH VALLEY, CA US","2018-11-01","0.00","89","57","82"
"USC00042319","DEATH VALLEY, CA US","2018-11-02","0.00","90","60","68"
"USC00042319","DEATH VALLEY, CA US","2018-11-03","0.00","93","56","82"
"USC00042319","DEATH VALLEY, CA US","2018-11-04","0.00","91","69","70"
"USC00042319","DEATH VALLEY, CA US","2018-11-05","0.00","90","55","69"
"USC00042319","DEATH VALLEY, CA US","2018-11-06","0.00","91","57","65"
"USC00042319","DEATH VALLEY, CA US","2018-11-07","0.00","86","51","76"
"USC00042319","DEATH VALLEY, CA US","2018-11-08","0.00","79","64","64"
"USC00042319","DEATH VALLEY, CA US","2018-11-09","0.00","81","56","56"
"USC00042319","DEATH VALLEY, CA US","2018-11-10","0.00","74","39","52"
"USC00042319","DEATH VALLEY, CA US","2018-11-11","0.00","76","44","54"
"USC00042319","DEATH VALLEY, CA US","2018-11-12","0.00","76","48","50"
"USC00042319","DEATH VALLEY, CA US","2018-11-13","0.00","73","43","55"
"USC00042319","DEATH VALLEY, CA US","2018-11-14","0.00","77","45","49"
"USC00042319","DEATH VALLEY, CA US","2018-11-15","0.00","77","42","54"
"USC00042319","DEATH VALLEY, CA US","2018-11-16","0.00","74","42","52"
"USC00042319","DEATH VALLEY, CA US","2018-11-17","0.00","75","41","51"
"USC00042319","DEATH VALLEY, CA US","2018-11-18","0.00","76","41","53"
"USC00042319","DEATH VALLEY, CA US","2018-11-19","0.00","72","42","51"
"USC00042319","DEATH VALLEY, CA US","2018-11-20","0.00","77","44","48"
"USC00042319","DEATH VALLEY, CA US","2018-11-21","0.00","74","40","56"
"USC00042319","DEATH VALLEY, CA US","2018-11-22","0.00","81","54","66"
"USC00042319","DEATH VALLEY, CA US","2018-11-23","0.00","73","52","54"
"USC00042319","DEATH VALLEY, CA US","2018-11-24","0.00","75","46","57"
"USC00042319","DEATH VALLEY, CA US","2018-11-25","0.00","74","51","53"
"USC00042319","DEATH VALLEY, CA US","2018-11-26","0.00","73","45","55"
"USC00042319","DEATH VALLEY, CA US","2018-11-27","0.00","70","46","50"
"USC00042319","DEATH VALLEY, CA US","2018-11-28","0.00","67","40","58"
"USC00042319","DEATH VALLEY, CA US","2018-11-29","0.00","77","52","61"
"USC00042319","DEATH VALLEY, CA US","2018-11-30","0.00","72","51","59"
"USC00042319","DEATH VALLEY, CA US","2018-12-02","0.00","68","49","49"
"USC00042319","DEATH VALLEY, CA US","2018-12-03","0.00","68","41","49"
"USC00042319","DEATH VALLEY, CA US","2018-12-04","0.00","66","46","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-05","0.00","66","48","53"
"USC00042319","DEATH VALLEY, CA US","2018-12-06","0.11","57","50","51"
"USC00042319","DEATH VALLEY, CA US","2018-12-07","0.00","67","50","53"
"USC00042319","DEATH VALLEY, CA US","2018-12-08","0.00","69","44","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-09","0.00","70","42","52"
"USC00042319","DEATH VALLEY, CA US","2018-12-10","0.00","67","45","51"
"USC00042319","DEATH VALLEY, CA US","2018-12-11","0.00","76","42","55"
"USC00042319","DEATH VALLEY, CA US","2018-12-12","0.00","77","43","58"
"USC00042319","DEATH VALLEY, CA US","2018-12-13","0.00","72","46","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-14","0.00","63","40","47"
"USC00042319","DEATH VALLEY, CA US","2018-12-15","0.00","68","36","45"
"USC00042319","DEATH VALLEY, CA US","2018-12-16","0.00","67","36","47"
"USC00042319","DEATH VALLEY, CA US","2018-12-17","0.00","69","46","51"
"USC00042319","DEATH VALLEY, CA US","2018-12-18","0.00","68","40","47"
"USC00042319","DEATH VALLEY, CA US","2018-12-19","0.00","68","38","48"
"USC00042319","DEATH VALLEY, CA US","2018-12-20","0.00","66","37","46"
"USC00042319","DEATH VALLEY, CA US","2018-12-21","0.00","69","42","49"
"USC00042319","DEATH VALLEY, CA US","2018-12-22","0.00","71","39","56"
"USC00042319","DEATH VALLEY, CA US","2018-12-23","0.00","68","43","44"
"USC00042319","DEATH VALLEY, CA US","2018-12-24","0.00","66","37","48"
"USC00042319","DEATH VALLEY, CA US","2018-12-25","0.00","70","45","63"
"USC00042319","DEATH VALLEY, CA US","2018-12-26","0.00","72","47","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-27","0.00","68","39","52"
"USC00042319","DEATH VALLEY, CA US","2018-12-28","0.00","63","48","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-29","0.00","63","45","46"
"USC00042319","DEATH VALLEY, CA US","2018-12-30","0.00","63","33","45"
"USC00042319","DEATH VALLEY, CA US","2018-12-31","0.00","63","38","50"
现在可创建覆盖整年的天气图了：
这里修改了文件名，以使用数据文件sitka_weather_2018_simple.csv，还修改了图表的标题，以反映其内容的变化。下图显示了生成的图形。
8. 再绘制一个数据系列
虽然改进后的图表已经显示了丰富的数据，但是还能再添加最低温度数据，使其更有用。为此，需要从数据文件中提取最低温度，并将它们添加到图表中，如下所示：
首先，添加空列表lows，用于存储最低温度。接下来，从每行的第七列(row[6])提取最低温度并存储。然后，添加调用plot()的代码，以使用蓝色绘制最低温度。最后，修改标题。下图显示了这样绘制出来的图表。
9. 给图表区着色
添加两个数据系列后，就可以知道每天的温度范围了。下面来给这个图表做最后的修饰，通过着色来呈现每天的温度范围。为此，将使用方法fill_between()。它接收一个x值系列和两个y值系列，并填充两个y值系列之间的空间。
首先，通过实参alpha指定颜色的透明度。alpha值为0表示完全透明，为1（默认设置）表示完全不透明。通过将alpha设置为0.5，可让红色和蓝色折线的颜色看起来更浅。
然后，向fill_between()传递一个x值系列（列表dates），以及两个y值系列（highs和lows）。实参facecolor指定填充区域的颜色，还将alpha设置成了较小的值0.1，让填充区域将两个数据系列连接起来的同时不分散观察者的注意力。下图显示了最高温度和最低温度之间的区域被填充后的图表。
这色让两个数据集之间的区域变得更显眼了。
10. 错误检查
我们应该能够使用任何地方的天气数据来运行sitka_highs_lows.py中的代码，但有些气象站收集的数据种类不同，有些气象站会偶尔出现故障，未能收集部分或全部应收集的数据。确实数据可能引发异常，如果不妥善处理，可能导致程序崩溃。
例如，来看看生成加利福利亚州死亡谷的温度图时出现的情况。请将以下内容编辑到文件death_valley_2018_simple.csv并保存到本章程序所在的文件夹。
"STATION","NAME","DATE","PRCP","TMAX","TMIN","TOBS"
"USC00042319","DEATH VALLEY, CA US","2018-01-01","0.00","65","34","42"
"USC00042319","DEATH VALLEY, CA US","2018-01-02","0.00","61","38","46"
"USC00042319","DEATH VALLEY, CA US","2018-01-03","0.00","69","34","54"
"USC00042319","DEATH VALLEY, CA US","2018-01-04","0.00","69","39","48"
"USC00042319","DEATH VALLEY, CA US","2018-01-05","0.00","74","40","57"
"USC00042319","DEATH VALLEY, CA US","2018-01-06","0.00","74","47","65"
"USC00042319","DEATH VALLEY, CA US","2018-01-07","0.00","77","54","60"
"USC00042319","DEATH VALLEY, CA US","2018-01-08","0.07","62","52","52"
"USC00042319","DEATH VALLEY, CA US","2018-01-09","0.40","60","51","51"
"USC00042319","DEATH VALLEY, CA US","2018-01-10","0.00","64","49","50"
"USC00042319","DEATH VALLEY, CA US","2018-01-11","0.00","67","45","51"
"USC00042319","DEATH VALLEY, CA US","2018-01-12","0.00","68","44","51"
"USC00042319","DEATH VALLEY, CA US","2018-01-13","0.00","73","45","55"
"USC00042319","DEATH VALLEY, CA US","2018-01-14","0.00","72","44","55"
"USC00042319","DEATH VALLEY, CA US","2018-01-15","0.00","73","46","55"
"USC00042319","DEATH VALLEY, CA US","2018-01-16","0.00","70","49","54"
"USC00042319","DEATH VALLEY, CA US","2018-01-17","0.00","71","47","54"
"USC00042319","DEATH VALLEY, CA US","2018-01-18","0.00","71","46","53"
"USC00042319","DEATH VALLEY, CA US","2018-01-19","0.01","78","48","56"
"USC00042319","DEATH VALLEY, CA US","2018-01-20","0.00","68","54","56"
"USC00042319","DEATH VALLEY, CA US","2018-01-21","0.00","69","46","47"
"USC00042319","DEATH VALLEY, CA US","2018-01-22","0.00","66","39","45"
"USC00042319","DEATH VALLEY, CA US","2018-01-23","0.00","69","37","46"
"USC00042319","DEATH VALLEY, CA US","2018-01-24","0.00","69","37","47"
"USC00042319","DEATH VALLEY, CA US","2018-01-25","0.00","75","42","52"
"USC00042319","DEATH VALLEY, CA US","2018-01-26","0.00","69","42","53"
"USC00042319","DEATH VALLEY, CA US","2018-01-27","0.00","69","38","50"
"USC00042319","DEATH VALLEY, CA US","2018-01-28","0.00","81","44","56"
"USC00042319","DEATH VALLEY, CA US","2018-01-29","0.00","81","48","61"
"USC00042319","DEATH VALLEY, CA US","2018-01-30","0.00","79","48","60"
"USC00042319","DEATH VALLEY, CA US","2018-01-31","0.00","78","44","53"
"USC00042319","DEATH VALLEY, CA US","2018-02-01","0.00","79","45","52"
"USC00042319","DEATH VALLEY, CA US","2018-02-02","0.00","81","45","59"
"USC00042319","DEATH VALLEY, CA US","2018-02-03","0.00","81","46","59"
"USC00042319","DEATH VALLEY, CA US","2018-02-04","0.00","87","57","61"
"USC00042319","DEATH VALLEY, CA US","2018-02-05","0.00","85","47","63"
"USC00042319","DEATH VALLEY, CA US","2018-02-06","0.00","88","51","70"
"USC00042319","DEATH VALLEY, CA US","2018-02-07","0.00","83","53","60"
"USC00042319","DEATH VALLEY, CA US","2018-02-08","0.00","85","48","57"
"USC00042319","DEATH VALLEY, CA US","2018-02-09","0.00","82","46","55"
"USC00042319","DEATH VALLEY, CA US","2018-02-10","0.00","82","48","62"
"USC00042319","DEATH VALLEY, CA US","2018-02-11","0.00","73","49","56"
"USC00042319","DEATH VALLEY, CA US","2018-02-12","0.00","70","47","57"
"USC00042319","DEATH VALLEY, CA US","2018-02-13","0.00","72","54","57"
"USC00042319","DEATH VALLEY, CA US","2018-02-14","0.00","74","50","58"
"USC00042319","DEATH VALLEY, CA US","2018-02-15","0.00","76","48","63"
"USC00042319","DEATH VALLEY, CA US","2018-02-16","0.00","76","53","56"
"USC00042319","DEATH VALLEY, CA US","2018-02-17","0.00","76","42","55"
"USC00042319","DEATH VALLEY, CA US","2018-02-18","0.00","","",""
"USC00042319","DEATH VALLEY, CA US","2018-02-19","0.00","66","46","46"
"USC00042319","DEATH VALLEY, CA US","2018-02-20","0.00","62","38","45"
"USC00042319","DEATH VALLEY, CA US","2018-02-21","0.00","65","39","48"
"USC00042319","DEATH VALLEY, CA US","2018-02-22","0.00","67","37","49"
"USC00042319","DEATH VALLEY, CA US","2018-02-23","0.00","64","40","43"
"USC00042319","DEATH VALLEY, CA US","2018-02-24","0.00","60","38","45"
"USC00042319","DEATH VALLEY, CA US","2018-02-25","0.00","70","42","47"
"USC00042319","DEATH VALLEY, CA US","2018-02-26","0.05","69","36","62"
"USC00042319","DEATH VALLEY, CA US","2018-02-27","0.00","62","44","45"
"USC00042319","DEATH VALLEY, CA US","2018-02-28","0.00","69","38","53"
"USC00042319","DEATH VALLEY, CA US","2018-03-01","0.00","77","47","62"
"USC00042319","DEATH VALLEY, CA US","2018-03-02","0.00","77","61","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-03","0.00","73","52","53"
"USC00042319","DEATH VALLEY, CA US","2018-03-04","0.00","70","44","52"
"USC00042319","DEATH VALLEY, CA US","2018-03-05","0.00","72","47","53"
"USC00042319","DEATH VALLEY, CA US","2018-03-06","0.00","79","48","59"
"USC00042319","DEATH VALLEY, CA US","2018-03-07","0.00","75","48","50"
"USC00042319","DEATH VALLEY, CA US","2018-03-08","0.00","80","41","60"
"USC00042319","DEATH VALLEY, CA US","2018-03-09","0.00","83","48","63"
"USC00042319","DEATH VALLEY, CA US","2018-03-10","0.04","80","58","59"
"USC00042319","DEATH VALLEY, CA US","2018-03-11","0.08","82","58","67"
"USC00042319","DEATH VALLEY, CA US","2018-03-12","0.00","85","58","72"
"USC00042319","DEATH VALLEY, CA US","2018-03-13","0.00","90","59","75"
"USC00042319","DEATH VALLEY, CA US","2018-03-14","0.00","80","64","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-15","0.00","77","56","64"
"USC00042319","DEATH VALLEY, CA US","2018-03-16","0.00","77","55","63"
"USC00042319","DEATH VALLEY, CA US","2018-03-17","0.00","73","55","60"
"USC00042319","DEATH VALLEY, CA US","2018-03-18","0.00","74","47","61"
"USC00042319","DEATH VALLEY, CA US","2018-03-19","0.00","81","49","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-20","0.00","79","52","68"
"USC00042319","DEATH VALLEY, CA US","2018-03-21","0.00","83","58","72"
"USC00042319","DEATH VALLEY, CA US","2018-03-22","0.03","79","66","67"
"USC00042319","DEATH VALLEY, CA US","2018-03-23","0.00","84","59","67"
"USC00042319","DEATH VALLEY, CA US","2018-03-24","0.00","81","63","63"
"USC00042319","DEATH VALLEY, CA US","2018-03-25","0.00","79","57","65"
"USC00042319","DEATH VALLEY, CA US","2018-03-26","0.00","79","56","64"
"USC00042319","DEATH VALLEY, CA US","2018-03-27","0.00","84","59","75"
"USC00042319","DEATH VALLEY, CA US","2018-03-28","0.00","94","70","75"
"USC00042319","DEATH VALLEY, CA US","2018-03-29","0.00","96","68","83"
"USC00042319","DEATH VALLEY, CA US","2018-03-30","0.00","97","68","78"
"USC00042319","DEATH VALLEY, CA US","2018-03-31","0.00","99","65","84"
"USC00042319","DEATH VALLEY, CA US","2018-04-01","0.00","97","66","81"
"USC00042319","DEATH VALLEY, CA US","2018-04-02","0.00","90","69","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-03","0.00","93","72","74"
"USC00042319","DEATH VALLEY, CA US","2018-04-04","0.00","95","61","76"
"USC00042319","DEATH VALLEY, CA US","2018-04-05","0.00","96","70","85"
"USC00042319","DEATH VALLEY, CA US","2018-04-06","0.00","98","76","83"
"USC00042319","DEATH VALLEY, CA US","2018-04-07","0.00","100","77","79"
"USC00042319","DEATH VALLEY, CA US","2018-04-08","0.00","96","65","76"
"USC00042319","DEATH VALLEY, CA US","2018-04-09","0.00","97","69","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-10","0.00","104","64","91"
"USC00042319","DEATH VALLEY, CA US","2018-04-11","0.00","103","80","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-12","0.00","83","67","68"
"USC00042319","DEATH VALLEY, CA US","2018-04-13","0.00","86","59","69"
"USC00042319","DEATH VALLEY, CA US","2018-04-14","0.00","91","64","75"
"USC00042319","DEATH VALLEY, CA US","2018-04-15","0.00","95","64","77"
"USC00042319","DEATH VALLEY, CA US","2018-04-16","0.00","82","59","59"
"USC00042319","DEATH VALLEY, CA US","2018-04-17","0.00","79","54","66"
"USC00042319","DEATH VALLEY, CA US","2018-04-18","0.00","87","54","74"
"USC00042319","DEATH VALLEY, CA US","2018-04-19","0.00","78","62","67"
"USC00042319","DEATH VALLEY, CA US","2018-04-20","0.00","95","59","76"
"USC00042319","DEATH VALLEY, CA US","2018-04-21","0.00","99","67","81"
"USC00042319","DEATH VALLEY, CA US","2018-04-22","0.00","103","68","87"
"USC00042319","DEATH VALLEY, CA US","2018-04-23","0.00","104","76","83"
"USC00042319","DEATH VALLEY, CA US","2018-04-24","0.00","105","73","87"
"USC00042319","DEATH VALLEY, CA US","2018-04-25","0.00","106","70","85"
"USC00042319","DEATH VALLEY, CA US","2018-04-26","0.00","108","73","90"
"USC00042319","DEATH VALLEY, CA US","2018-04-27","0.00","104","80","80"
"USC00042319","DEATH VALLEY, CA US","2018-04-28","0.00","95","70","79"
"USC00042319","DEATH VALLEY, CA US","2018-04-29","0.00","95","71","74"
"USC00042319","DEATH VALLEY, CA US","2018-04-30","0.00","85","65","73"
"USC00042319","DEATH VALLEY, CA US","2018-05-01","0.00","84","60","60"
"USC00042319","DEATH VALLEY, CA US","2018-05-02","0.00","82","59","73"
"USC00042319","DEATH VALLEY, CA US","2018-05-03","0.00","97","63","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-04","0.00","102","66","87"
"USC00042319","DEATH VALLEY, CA US","2018-05-05","0.00","105","72","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-06","0.00","110","77","92"
"USC00042319","DEATH VALLEY, CA US","2018-05-07","0.00","108","82","89"
"USC00042319","DEATH VALLEY, CA US","2018-05-08","0.00","109","77","96"
"USC00042319","DEATH VALLEY, CA US","2018-05-09","0.00","116","82","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-10","0.00","107","79","89"
"USC00042319","DEATH VALLEY, CA US","2018-05-11","0.00","104","78","78"
"USC00042319","DEATH VALLEY, CA US","2018-05-12","0.00","94","69","77"
"USC00042319","DEATH VALLEY, CA US","2018-05-13","0.00","95","71","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-14","0.00","97","74","80"
"USC00042319","DEATH VALLEY, CA US","2018-05-15","0.00","100","72","85"
"USC00042319","DEATH VALLEY, CA US","2018-05-16","0.00","101","79","80"
"USC00042319","DEATH VALLEY, CA US","2018-05-17","0.00","97","69","81"
"USC00042319","DEATH VALLEY, CA US","2018-05-18","0.00","102","75","88"
"USC00042319","DEATH VALLEY, CA US","2018-05-19","0.00","105","82","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-20","0.00","103","81","83"
"USC00042319","DEATH VALLEY, CA US","2018-05-21","0.00","97","81","82"
"USC00042319","DEATH VALLEY, CA US","2018-05-22","0.00","100","76","86"
"USC00042319","DEATH VALLEY, CA US","2018-05-23","0.00","103","80","88"
"USC00042319","DEATH VALLEY, CA US","2018-05-24","0.00","104","83","89"
"USC00042319","DEATH VALLEY, CA US","2018-05-25","0.00","95","75","75"
"USC00042319","DEATH VALLEY, CA US","2018-05-26","0.00","94","70","76"
"USC00042319","DEATH VALLEY, CA US","2018-05-27","0.00","102","74","87"
"USC00042319","DEATH VALLEY, CA US","2018-05-28","0.00","108","79","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-29","0.00","111","84","91"
"USC00042319","DEATH VALLEY, CA US","2018-05-30","0.00","110","89","90"
"USC00042319","DEATH VALLEY, CA US","2018-05-31","0.00","101","81","81"
"USC00042319","DEATH VALLEY, CA US","2018-06-01","0.00","107","71","83"
"USC00042319","DEATH VALLEY, CA US","2018-06-02","0.00","113","82","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-03","0.00","118","79","101"
"USC00042319","DEATH VALLEY, CA US","2018-06-04","0.00","117","87","98"
"USC00042319","DEATH VALLEY, CA US","2018-06-05","0.00","114","88","95"
"USC00042319","DEATH VALLEY, CA US","2018-06-06","0.00","109","88","90"
"USC00042319","DEATH VALLEY, CA US","2018-06-07","0.00","109","85","90"
"USC00042319","DEATH VALLEY, CA US","2018-06-08","0.00","111","81","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-09","0.00","113","88","90"
"USC00042319","DEATH VALLEY, CA US","2018-06-10","0.00","106","85","88"
"USC00042319","DEATH VALLEY, CA US","2018-06-11","0.00","113","78","95"
"USC00042319","DEATH VALLEY, CA US","2018-06-12","0.00","117","82","101"
"USC00042319","DEATH VALLEY, CA US","2018-06-13","0.00","119","95","98"
"USC00042319","DEATH VALLEY, CA US","2018-06-14","0.00","117","90","96"
"USC00042319","DEATH VALLEY, CA US","2018-06-15","0.00","112","92","92"
"USC00042319","DEATH VALLEY, CA US","2018-06-16","0.00","107","85","86"
"USC00042319","DEATH VALLEY, CA US","2018-06-17","0.00","101","78","82"
"USC00042319","DEATH VALLEY, CA US","2018-06-18","0.00","103","75","88"
"USC00042319","DEATH VALLEY, CA US","2018-06-19","0.00","111","79","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-20","0.00","118","87","101"
"USC00042319","DEATH VALLEY, CA US","2018-06-21","0.00","126","94","105"
"USC00042319","DEATH VALLEY, CA US","2018-06-22","0.00","121","96","100"
"USC00042319","DEATH VALLEY, CA US","2018-06-23","0.00","120","92","100"
"USC00042319","DEATH VALLEY, CA US","2018-06-24","0.00","119","92","102"
"USC00042319","DEATH VALLEY, CA US","2018-06-25","0.00","121","97","103"
"USC00042319","DEATH VALLEY, CA US","2018-06-26","0.00","120","96","102"
"USC00042319","DEATH VALLEY, CA US","2018-06-27","0.00","117","94","100"
"USC00042319","DEATH VALLEY, CA US","2018-06-28","0.00","116","89","94"
"USC00042319","DEATH VALLEY, CA US","2018-06-29","0.00","111","86","97"
"USC00042319","DEATH VALLEY, CA US","2018-06-30","0.00","118","88","102"
"USC00042319","DEATH VALLEY, CA US","2018-07-01","0.00","118","89","102"
"USC00042319","DEATH VALLEY, CA US","2018-07-02","0.00","119","96","100"
"USC00042319","DEATH VALLEY, CA US","2018-07-03","0.00","117","94","96"
"USC00042319","DEATH VALLEY, CA US","2018-07-04","0.00","113","90","97"
"USC00042319","DEATH VALLEY, CA US","2018-07-05","0.00","117","89","95"
"USC00042319","DEATH VALLEY, CA US","2018-07-06","0.00","121","82","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-07","0.00","121","94","108"
"USC00042319","DEATH VALLEY, CA US","2018-07-08","0.00","126","96","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-09","0.03","121","103","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-10","0.01","114","94","97"
"USC00042319","DEATH VALLEY, CA US","2018-07-11","0.00","113","94","99"
"USC00042319","DEATH VALLEY, CA US","2018-07-12","0.01","115","86","94"
"USC00042319","DEATH VALLEY, CA US","2018-07-13","0.00","114","86","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-14","0.00","120","97","106"
"USC00042319","DEATH VALLEY, CA US","2018-07-15","0.00","120","99","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-16","0.00","124","96","108"
"USC00042319","DEATH VALLEY, CA US","2018-07-17","0.00","123","102","109"
"USC00042319","DEATH VALLEY, CA US","2018-07-18","0.00","120","103","109"
"USC00042319","DEATH VALLEY, CA US","2018-07-19","0.00","121","101","101"
"USC00042319","DEATH VALLEY, CA US","2018-07-20","0.00","120","93","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-21","0.00","115","96","103"
"USC00042319","DEATH VALLEY, CA US","2018-07-22","0.00","120","93","103"
"USC00042319","DEATH VALLEY, CA US","2018-07-23","0.00","125","96","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-24","0.00","127","95","111"
"USC00042319","DEATH VALLEY, CA US","2018-07-25","0.00","127","102","109"
"USC00042319","DEATH VALLEY, CA US","2018-07-26","0.00","127","100","110"
"USC00042319","DEATH VALLEY, CA US","2018-07-27","0.00","127","94","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-28","0.00","124","101","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-29","0.00","124","100","105"
"USC00042319","DEATH VALLEY, CA US","2018-07-30","0.00","123","103","107"
"USC00042319","DEATH VALLEY, CA US","2018-07-31","0.00","121","103","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-01","0.00","120","96","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-02","0.00","121","97","105"
"USC00042319","DEATH VALLEY, CA US","2018-08-03","0.00","120","98","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-04","0.00","119","97","101"
"USC00042319","DEATH VALLEY, CA US","2018-08-05","0.00","117","88","101"
"USC00042319","DEATH VALLEY, CA US","2018-08-06","0.00","119","85","95"
"USC00042319","DEATH VALLEY, CA US","2018-08-07","0.00","121","80","97"
"USC00042319","DEATH VALLEY, CA US","2018-08-08","0.00","122","85","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-09","0.00","122","90","106"
"USC00042319","DEATH VALLEY, CA US","2018-08-10","0.00","119","98","102"
"USC00042319","DEATH VALLEY, CA US","2018-08-11","0.00","119","97","102"
"USC00042319","DEATH VALLEY, CA US","2018-08-12","0.00","112","93","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-13","0.00","117","94","105"
"USC00042319","DEATH VALLEY, CA US","2018-08-14","0.00","118","95","102"
"USC00042319","DEATH VALLEY, CA US","2018-08-15","0.00","117","95","101"
"USC00042319","DEATH VALLEY, CA US","2018-08-16","0.00","117","95","100"
"USC00042319","DEATH VALLEY, CA US","2018-08-17","0.00","116","93","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-18","0.00","119","97","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-19","0.00","122","92","104"
"USC00042319","DEATH VALLEY, CA US","2018-08-20","0.00","119","99","103"
"USC00042319","DEATH VALLEY, CA US","2018-08-21","0.00","117","96","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-22","0.00","115","92","98"
"USC00042319","DEATH VALLEY, CA US","2018-08-23","0.00","115","91","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-24","0.00","113","88","98"
"USC00042319","DEATH VALLEY, CA US","2018-08-25","0.00","113","88","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-26","0.00","114","87","95"
"USC00042319","DEATH VALLEY, CA US","2018-08-27","0.00","111","86","94"
"USC00042319","DEATH VALLEY, CA US","2018-08-28","0.00","109","83","94"
"USC00042319","DEATH VALLEY, CA US","2018-08-29","0.00","112","88","96"
"USC00042319","DEATH VALLEY, CA US","2018-08-30","0.00","113","91","95"
"USC00042319","DEATH VALLEY, CA US","2018-08-31","0.00","109","83","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-01","0.00","113","83","89"
"USC00042319","DEATH VALLEY, CA US","2018-09-02","0.00","113","78","101"
"USC00042319","DEATH VALLEY, CA US","2018-09-03","0.00","113","89","98"
"USC00042319","DEATH VALLEY, CA US","2018-09-04","0.00","112","87","95"
"USC00042319","DEATH VALLEY, CA US","2018-09-05","0.00","110","84","98"
"USC00042319","DEATH VALLEY, CA US","2018-09-06","0.00","114","82","98"
"USC00042319","DEATH VALLEY, CA US","2018-09-07","0.00","115","85","99"
"USC00042319","DEATH VALLEY, CA US","2018-09-08","0.00","120","83","99"
"USC00042319","DEATH VALLEY, CA US","2018-09-09","0.00","116","88","96"
"USC00042319","DEATH VALLEY, CA US","2018-09-10","0.00","111","87","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-11","0.00","109","84","93"
"USC00042319","DEATH VALLEY, CA US","2018-09-12","0.00","110","85","93"
"USC00042319","DEATH VALLEY, CA US","2018-09-13","0.00","107","78","91"
"USC00042319","DEATH VALLEY, CA US","2018-09-14","0.00","109","82","91"
"USC00042319","DEATH VALLEY, CA US","2018-09-15","0.00","107","84","88"
"USC00042319","DEATH VALLEY, CA US","2018-09-16","0.00","109","78","92"
"USC00042319","DEATH VALLEY, CA US","2018-09-17","0.00","108","76","92"
"USC00042319","DEATH VALLEY, CA US","2018-09-18","0.00","106","74","86"
"USC00042319","DEATH VALLEY, CA US","2018-09-19","0.00","108","71","84"
"USC00042319","DEATH VALLEY, CA US","2018-09-20","0.00","107","77","81"
"USC00042319","DEATH VALLEY, CA US","2018-09-21","0.00","109","71","86"
"USC00042319","DEATH VALLEY, CA US","2018-09-22","0.00","110","74","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-23","0.00","111","85","90"
"USC00042319","DEATH VALLEY, CA US","2018-09-24","0.00","108","77","89"
"USC00042319","DEATH VALLEY, CA US","2018-09-25","0.00","111","79","86"
"USC00042319","DEATH VALLEY, CA US","2018-09-26","0.00","109","78","85"
"USC00042319","DEATH VALLEY, CA US","2018-09-27","0.00","110","69","87"
"USC00042319","DEATH VALLEY, CA US","2018-09-28","0.00","110","70","94"
"USC00042319","DEATH VALLEY, CA US","2018-09-29","0.00","105","86","88"
"USC00042319","DEATH VALLEY, CA US","2018-09-30","0.00","103","82","90"
"USC00042319","DEATH VALLEY, CA US","2018-10-01","0.00","104","86","89"
"USC00042319","DEATH VALLEY, CA US","2018-10-02","0.00","101","86","87"
"USC00042319","DEATH VALLEY, CA US","2018-10-03","0.00","96","81","81"
"USC00042319","DEATH VALLEY, CA US","2018-10-04","0.00","93","75","79"
"USC00042319","DEATH VALLEY, CA US","2018-10-05","0.00","95","73","83"
"USC00042319","DEATH VALLEY, CA US","2018-10-06","0.07","94","73","74"
"USC00042319","DEATH VALLEY, CA US","2018-10-07","0.00","87","72","76"
"USC00042319","DEATH VALLEY, CA US","2018-10-08","0.00","93","69","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-09","0.00","92","63","78"
"USC00042319","DEATH VALLEY, CA US","2018-10-10","0.00","91","68","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-11","0.00","91","70","79"
"USC00042319","DEATH VALLEY, CA US","2018-10-12","0.00","93","72","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-13","0.00","96","66","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-14","0.00","89","68","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-15","0.00","86","61","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-16","0.00","91","68","73"
"USC00042319","DEATH VALLEY, CA US","2018-10-17","0.00","90","58","69"
"USC00042319","DEATH VALLEY, CA US","2018-10-18","0.00","91","58","68"
"USC00042319","DEATH VALLEY, CA US","2018-10-19","0.00","96","56","80"
"USC00042319","DEATH VALLEY, CA US","2018-10-20","0.00","96","72","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-21","0.00","94","70","76"
"USC00042319","DEATH VALLEY, CA US","2018-10-22","0.00","95","69","77"
"USC00042319","DEATH VALLEY, CA US","2018-10-23","0.00","97","64","79"
"USC00042319","DEATH VALLEY, CA US","2018-10-24","0.00","96","64","75"
"USC00042319","DEATH VALLEY, CA US","2018-10-25","0.00","96","63","73"
"USC00042319","DEATH VALLEY, CA US","2018-10-26","0.00","95","61","75"
"USC00042319","DEATH VALLEY, CA US","2018-10-27","0.00","94","59","71"
"USC00042319","DEATH VALLEY, CA US","2018-10-28","0.00","93","59","74"
"USC00042319","DEATH VALLEY, CA US","2018-10-29","0.00","94","59","80"
"USC00042319","DEATH VALLEY, CA US","2018-10-30","0.00","85","71","72"
"USC00042319","DEATH VALLEY, CA US","2018-10-31","0.00","83","61","61"
"USC00042319","DEATH VALLEY, CA US","2018-11-01","0.00","89","57","82"
"USC00042319","DEATH VALLEY, CA US","2018-11-02","0.00","90","60","68"
"USC00042319","DEATH VALLEY, CA US","2018-11-03","0.00","93","56","82"
"USC00042319","DEATH VALLEY, CA US","2018-11-04","0.00","91","69","70"
"USC00042319","DEATH VALLEY, CA US","2018-11-05","0.00","90","55","69"
"USC00042319","DEATH VALLEY, CA US","2018-11-06","0.00","91","57","65"
"USC00042319","DEATH VALLEY, CA US","2018-11-07","0.00","86","51","76"
"USC00042319","DEATH VALLEY, CA US","2018-11-08","0.00","79","64","64"
"USC00042319","DEATH VALLEY, CA US","2018-11-09","0.00","81","56","56"
"USC00042319","DEATH VALLEY, CA US","2018-11-10","0.00","74","39","52"
"USC00042319","DEATH VALLEY, CA US","2018-11-11","0.00","76","44","54"
"USC00042319","DEATH VALLEY, CA US","2018-11-12","0.00","76","48","50"
"USC00042319","DEATH VALLEY, CA US","2018-11-13","0.00","73","43","55"
"USC00042319","DEATH VALLEY, CA US","2018-11-14","0.00","77","45","49"
"USC00042319","DEATH VALLEY, CA US","2018-11-15","0.00","77","42","54"
"USC00042319","DEATH VALLEY, CA US","2018-11-16","0.00","74","42","52"
"USC00042319","DEATH VALLEY, CA US","2018-11-17","0.00","75","41","51"
"USC00042319","DEATH VALLEY, CA US","2018-11-18","0.00","76","41","53"
"USC00042319","DEATH VALLEY, CA US","2018-11-19","0.00","72","42","51"
"USC00042319","DEATH VALLEY, CA US","2018-11-20","0.00","77","44","48"
"USC00042319","DEATH VALLEY, CA US","2018-11-21","0.00","74","40","56"
"USC00042319","DEATH VALLEY, CA US","2018-11-22","0.00","81","54","66"
"USC00042319","DEATH VALLEY, CA US","2018-11-23","0.00","73","52","54"
"USC00042319","DEATH VALLEY, CA US","2018-11-24","0.00","75","46","57"
"USC00042319","DEATH VALLEY, CA US","2018-11-25","0.00","74","51","53"
"USC00042319","DEATH VALLEY, CA US","2018-11-26","0.00","73","45","55"
"USC00042319","DEATH VALLEY, CA US","2018-11-27","0.00","70","46","50"
"USC00042319","DEATH VALLEY, CA US","2018-11-28","0.00","67","40","58"
"USC00042319","DEATH VALLEY, CA US","2018-11-29","0.00","77","52","61"
"USC00042319","DEATH VALLEY, CA US","2018-11-30","0.00","72","51","59"
"USC00042319","DEATH VALLEY, CA US","2018-12-02","0.00","68","49","49"
"USC00042319","DEATH VALLEY, CA US","2018-12-03","0.00","68","41","49"
"USC00042319","DEATH VALLEY, CA US","2018-12-04","0.00","66","46","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-05","0.00","66","48","53"
"USC00042319","DEATH VALLEY, CA US","2018-12-06","0.11","57","50","51"
"USC00042319","DEATH VALLEY, CA US","2018-12-07","0.00","67","50","53"
"USC00042319","DEATH VALLEY, CA US","2018-12-08","0.00","69","44","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-09","0.00","70","42","52"
"USC00042319","DEATH VALLEY, CA US","2018-12-10","0.00","67","45","51"
"USC00042319","DEATH VALLEY, CA US","2018-12-11","0.00","76","42","55"
"USC00042319","DEATH VALLEY, CA US","2018-12-12","0.00","77","43","58"
"USC00042319","DEATH VALLEY, CA US","2018-12-13","0.00","72","46","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-14","0.00","63","40","47"
"USC00042319","DEATH VALLEY, CA US","2018-12-15","0.00","68","36","45"
"USC00042319","DEATH VALLEY, CA US","2018-12-16","0.00","67","36","47"
"USC00042319","DEATH VALLEY, CA US","2018-12-17","0.00","69","46","51"
"USC00042319","DEATH VALLEY, CA US","2018-12-18","0.00","68","40","47"
"USC00042319","DEATH VALLEY, CA US","2018-12-19","0.00","68","38","48"
"USC00042319","DEATH VALLEY, CA US","2018-12-20","0.00","66","37","46"
"USC00042319","DEATH VALLEY, CA US","2018-12-21","0.00","69","42","49"
"USC00042319","DEATH VALLEY, CA US","2018-12-22","0.00","71","39","56"
"USC00042319","DEATH VALLEY, CA US","2018-12-23","0.00","68","43","44"
"USC00042319","DEATH VALLEY, CA US","2018-12-24","0.00","66","37","48"
"USC00042319","DEATH VALLEY, CA US","2018-12-25","0.00","70","45","63"
"USC00042319","DEATH VALLEY, CA US","2018-12-26","0.00","72","47","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-27","0.00","68","39","52"
"USC00042319","DEATH VALLEY, CA US","2018-12-28","0.00","63","48","50"
"USC00042319","DEATH VALLEY, CA US","2018-12-29","0.00","63","45","46"
"USC00042319","DEATH VALLEY, CA US","2018-12-30","0.00","63","33","45"
"USC00042319","DEATH VALLEY, CA US","2018-12-31","0.00","63","38","50"
首先通过编写代码来查看这个数据文件包含的文件头：
输出如下：
与前面一样，日期也在索引2处，但最高温度和最低温度分别在索引4和索引5处，因此需要修改代码中的索引，以反映这一点。另外，这个气象站没有记录平均温度，而记录了TOBS，即特定时点的温度。
为演示缺失数据时的状况，我故意从这个文件中删除了一项温度数据。下面来修改sitka_highs_lows.py，使用前面所说的索引来生成死亡谷的天气图，看看将出现什么状况：
首先，修改索引，使其对应于这个文件中TMAX和TMIN的位置。
运行这个程序时出现了错误，如下述输出的最后一行所示：
该traceback指出，Python无法处理其中一天的最高温度，因为无法将空字符串('')转换为整数。我们只要看一下文件death_valley_2018_simple.csv，就知道缺失了哪项数据，但这里不这样做，而是直接对缺失数据的情形进行处理。
为此，在从CSV文件中读取值时执行错误检查代码，对可能出现的异常进行处理，如下所示：
对于每一行，都尝试从中提取日期、最高温度和最低温度。只要缺失其中一项数据，Python就会引发ValueError异常。我们这样进行处理：打印一条错误消息，指出缺失数据的日期。打印错误消息后，循环将接着处理下一行。如果获取特定日期的所有数据时没有发生错误，就运行else代码块，将数据附加到相应列表的末尾。这里绘图时使用的是有关另一个地方的信息，因此修改标题以指出这个地方。因为标题过长，所以我们缩小了字号。
如果现在运行death_valley_highs_lows.py，将发现缺失数据的日期只有一个：
妥善地处理错误后，代码能够生成图形并忽略确实数据的那天。下图显示了绘制出的图形。
将这个图表与锡特卡的图表进行比较可知，总体而言，死亡谷比阿拉斯加东南部暖和，这符合预期。同时，死亡谷沙漠中每天的温差也更大——从着色区域的高度可以看出这一点。
你是用的很多数据集都可能确实数据、格式不正确或数据本身不正确。对于这样的情形，可使用之前介绍的工具来处理。在这里，使用了一个try-expect-else代码块来处理数据确实的问题。在有些情况下，需要使用continue来跳过一些数据，或者使用remove()或del()将已提取的数据删除。只要能进行精确而有意义的可视化，采用任何管用的方法都是可以的。
11. 自己动手下载数据
如果你想自己下载天气数据，可采取如下步骤。
（1）访问网站NOAA Climate Data Online。在Discover Data By部分，单击Search Tool。在下拉列表Select a Dataset中，选择Daily Summaries。
（2）选择一个日期范围，在Search For下拉列表中ZIP Codes，输入你感兴趣地区的邮政编码，再单击Search按钮。
（3）在下一个页面中，你将看到指定地区的地图和相关信息。点击地区名下方的View Full Details或单击地图再单击Full Deatil。
（4）向下滚动并单击Station List，以显示该地区的气象站，再选择一个气象站并单击Add to Cart。虽然这个网站使用了购物车图表，但提供的数据是免费的。单击右上角的购物车。
（5）在Select the Output中选择Custom GHCN-Daily CSV。确认日期范围无误后点击Continue。
（6）在下一个页面中，可选择要下载的数据类型。可以只下载一种数据（如气温），也可以下载该气象站提供的所有数据。做出选择后单击Continue。
（7）在最后一个页面，你讲看到订单小结。请输入你的电子邮箱地址，再单击Submit Order。你将收到一封邮件，指出收到你的订单。几分钟后，你将收到另一封邮件，其中包含用于下载数据的链接。
你下载的数据与本届处理的数据有类似的结构，但包含的文件头可能不同。然而，只要按本节介绍的步骤做，就能对你感兴趣的数据进行可视化。
二、制作全球地震散点图：JSON格式
在本节中，将下载一个数据集，其中记录了一个月内全球发生的所有地震，再制作一幅散点图来展示这些地震的位置和震级。这些数据是以JSON格式存储的，因此要使用模块json来处理。Plotly提供了根据位置数据绘制地图的工具，适合初学者使用。你将使用它来进行可视化并指出全球的地震分布情况。
1. 地震数据
请将以下内容编辑到文件eq_data_1_day_m1.json中，你将发现其中内容密密麻麻，难以阅读：
{"type":"FeatureCollection","metadata":{"generated":1550361461000,"url":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_day.geojson","title":"USGS Magnitude 1.0+ Earthquakes, Past Day","status":200,"api":"1.7.0","count":158},"features":[{"type":"Feature","properties":{"mag":0.96,"place":"8km NE of Aguanga, CA","time":1550360775470,"updated":1550360993593,"tz":-480,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ci37532978","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ci37532978.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":14,"net":"ci","code":"37532978","ids":",ci37532978,","sources":",ci,","types":",geoserve,nearby-cities,origin,phase-data,","nst":32,"dmin":0.02648,"rms":0.15,"gap":37,"magType":"ml","type":"earthquake","title":"M 1.0 - 8km NE of Aguanga, CA"},"geometry":{"type":"Point","coordinates":[-116.7941667,33.4863333,3.22]},"id":"ci37532978"},
{"type":"Feature","properties":{"mag":1.2,"place":"11km NNE of North Nenana, Alaska","time":1550358909272,"updated":1550359211283,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak0192641ikq","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak0192641ikq.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":22,"net":"ak","code":"0192641ikq","ids":",ak0192641ikq,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.94,"gap":null,"magType":"ml","type":"earthquake","title":"M 1.2 - 11km NNE of North Nenana, Alaska"},"geometry":{"type":"Point","coordinates":[-148.9865,64.6673,0]},"id":"ak0192641ikq"},
{"type":"Feature","properties":{"mag":4.3,"place":"69km NNW of Ayna, Peru","time":1550358621670,"updated":1550360269040,"tz":-300,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/us2000jizi","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us2000jizi.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":284,"net":"us","code":"2000jizi","ids":",us2000jizi,","sources":",us,","types":",geoserve,origin,phase-data,","nst":null,"dmin":2.553,"rms":1.08,"gap":98,"magType":"mb","type":"earthquake","title":"M 4.3 - 69km NNW of Ayna, Peru"},"geometry":{"type":"Point","coordinates":[-74.2343,-12.1025,10]},"id":"us2000jizi"},
{"type":"Feature","properties":{"mag":3.6,"place":"126km SSE of Cold Bay, Alaska","time":1550358590770,"updated":1550359431040,"tz":-660,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/us2000jizh","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us2000jizh.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":199,"net":"us","code":"2000jizh","ids":",us2000jizh,","sources":",us,","types":",geoserve,origin,phase-data,","nst":null,"dmin":1.194,"rms":0.82,"gap":177,"magType":"mb","type":"earthquake","title":"M 3.6 - 126km SSE of Cold Bay, Alaska"},"geometry":{"type":"Point","coordinates":[-161.6801,54.2232,46.66]},"id":"us2000jizh"},
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{"type":"Feature","properties":{"mag":2.6,"place":"71km SSW of Kobuk, Alaska","time":1550283448150,"updated":1550354537040,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/us2000jipg","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us2000jipg.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":104,"net":"us","code":"2000jipg","ids":",us2000jipg,","sources":",us,","types":",geoserve,origin,phase-data,","nst":null,"dmin":0.169,"rms":0.94,"gap":52,"magType":"ml","type":"earthquake","title":"M 2.6 - 71km SSW of Kobuk, Alaska"},"geometry":{"type":"Point","coordinates":[-157.2918,66.29,10]},"id":"us2000jipg"},
{"type":"Feature","properties":{"mag":1.7,"place":"3km SSE of Big Lake, Alaska","time":1550282521297,"updated":1550282748813,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak01925rgly9","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak01925rgly9.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":44,"net":"ak","code":"01925rgly9","ids":",ak01925rgly9,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.61,"gap":null,"magType":"ml","type":"earthquake","title":"M 1.7 - 3km SSE of Big Lake, Alaska"},"geometry":{"type":"Point","coordinates":[-149.9289,61.493,33]},"id":"ak01925rgly9"},
{"type":"Feature","properties":{"mag":4.2,"place":"22km SSW of Lithakia, Greece","time":1550282235550,"updated":1550316595902,"tz":120,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/us2000jinx","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us2000jinx.geojson","felt":2,"cdi":2,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":272,"net":"us","code":"2000jinx","ids":",us2000jinx,","sources":",us,","types":",dyfi,geoserve,origin,phase-data,","nst":null,"dmin":1.028,"rms":1.23,"gap":143,"magType":"mb","type":"earthquake","title":"M 4.2 - 22km SSW of Lithakia, Greece"},"geometry":{"type":"Point","coordinates":[20.7165,37.5408,10]},"id":"us2000jinx"},
{"type":"Feature","properties":{"mag":3.28,"place":"51km NW of San Antonio, Puerto Rico","time":1550282073560,"updated":1550284841040,"tz":-240,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/pr2019047000","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/pr2019047000.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":166,"net":"pr","code":"2019047000","ids":",pr2019047000,us2000jipc,","sources":",pr,us,","types":",geoserve,origin,phase-data,","nst":14,"dmin":0.398,"rms":0.45,"gap":284,"magType":"md","type":"earthquake","title":"M 3.3 - 51km NW of San Antonio, Puerto Rico"},"geometry":{"type":"Point","coordinates":[-67.4526,18.7816,9]},"id":"pr2019047000"},
{"type":"Feature","properties":{"mag":2.2,"place":"65km NNE of Redoubt Volcano, Alaska","time":1550281301461,"updated":1550281693402,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak01925r3md0","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak01925r3md0.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":74,"net":"ak","code":"01925r3md0","ids":",ak01925r3md0,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.38,"gap":null,"magType":"ml","type":"earthquake","title":"M 2.2 - 65km NNE of Redoubt Volcano, Alaska"},"geometry":{"type":"Point","coordinates":[-152.3045,61.0343,107.8]},"id":"ak01925r3md0"},
{"type":"Feature","properties":{"mag":1.16,"place":"2km NNW of The Geysers, CA","time":1550281013290,"updated":1550284385030,"tz":-480,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/nc73142836","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/nc73142836.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":21,"net":"nc","code":"73142836","ids":",nc73142836,","sources":",nc,","types":",geoserve,nearby-cities,origin,phase-data,scitech-link,","nst":14,"dmin":0.01768,"rms":0.02,"gap":76,"magType":"md","type":"earthquake","title":"M 1.2 - 2km NNW of The Geysers, CA"},"geometry":{"type":"Point","coordinates":[-122.7653351,38.7921677,1.72]},"id":"nc73142836"},
{"type":"Feature","properties":{"mag":2.5,"place":"253km SE of Kodiak, Alaska","time":1550280915213,"updated":1550281201571,"tz":-600,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak01925r2c5r","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak01925r2c5r.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":96,"net":"ak","code":"01925r2c5r","ids":",ak01925r2c5r,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.69,"gap":null,"magType":"ml","type":"earthquake","title":"M 2.5 - 253km SE of Kodiak, Alaska"},"geometry":{"type":"Point","coordinates":[-149.4308,56.1936,6.2]},"id":"ak01925r2c5r"},
{"type":"Feature","properties":{"mag":4.7,"place":"79km SSW of Bengkulu, Indonesia","time":1550280431850,"updated":1550282712040,"tz":420,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/us2000jine","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us2000jine.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":340,"net":"us","code":"2000jine","ids":",us2000jine,","sources":",us,","types":",geoserve,origin,phase-data,","nst":null,"dmin":0.961,"rms":0.73,"gap":163,"magType":"mb","type":"earthquake","title":"M 4.7 - 79km SSW of Bengkulu, Indonesia"},"geometry":{"type":"Point","coordinates":[101.9982,-4.4716,35]},"id":"us2000jine"},
{"type":"Feature","properties":{"mag":3.32,"place":"84km N of Loiza, Puerto Rico","time":1550280281960,"updated":1550311023887,"tz":-240,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/pr2019047005","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/pr2019047005.geojson","felt":1,"cdi":4.1,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":170,"net":"pr","code":"2019047005","ids":",pr2019047005,","sources":",pr,","types":",dyfi,geoserve,origin,phase-data,","nst":3,"dmin":1.052,"rms":0.58,"gap":330,"magType":"md","type":"earthquake","title":"M 3.3 - 84km N of Loiza, Puerto Rico"},"geometry":{"type":"Point","coordinates":[-65.7698,19.1911,124]},"id":"pr2019047005"},
{"type":"Feature","properties":{"mag":2.5,"place":"81km S of Kaktovik, Alaska","time":1550279570240,"updated":1550354319040,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/us2000jinc","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us2000jinc.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":96,"net":"us","code":"2000jinc","ids":",us2000jinc,","sources":",us,","types":",geoserve,origin,phase-data,","nst":null,"dmin":0.224,"rms":0.79,"gap":99,"magType":"ml","type":"earthquake","title":"M 2.5 - 81km S of Kaktovik, Alaska"},"geometry":{"type":"Point","coordinates":[-143.7027,69.4029,10]},"id":"us2000jinc"},
{"type":"Feature","properties":{"mag":2.75,"place":"5km WNW of Mayaguez, Puerto Rico","time":1550279428370,"updated":1550296945040,"tz":-240,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/pr2019047004","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/pr2019047004.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":116,"net":"pr","code":"2019047004","ids":",pr2019047004,us2000jira,","sources":",pr,us,","types":",geoserve,origin,phase-data,","nst":6,"dmin":0.2259,"rms":0.13,"gap":213,"magType":"md","type":"earthquake","title":"M 2.8 - 5km WNW of Mayaguez, Puerto Rico"},"geometry":{"type":"Point","coordinates":[-67.1808,18.2208,108]},"id":"pr2019047004"},
{"type":"Feature","properties":{"mag":3.2,"place":"91km N of Road Town, British Virgin Islands","time":1550279048060,"updated":1550297378040,"tz":-240,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/pr2019047003","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/pr2019047003.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":158,"net":"pr","code":"2019047003","ids":",pr2019047003,us2000jir9,","sources":",pr,us,","types":",geoserve,origin,phase-data,","nst":4,"dmin":1.5988,"rms":0.25,"gap":346,"magType":"md","type":"earthquake","title":"M 3.2 - 91km N of Road Town, British Virgin Islands"},"geometry":{"type":"Point","coordinates":[-64.6176,19.1621,100]},"id":"pr2019047003"},
{"type":"Feature","properties":{"mag":1.6,"place":"13km S of Big Lake, Alaska","time":1550277554751,"updated":1550277844310,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak01925qhp9v","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak01925qhp9v.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":39,"net":"ak","code":"01925qhp9v","ids":",ak01925qhp9v,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.47,"gap":null,"magType":"ml","type":"earthquake","title":"M 1.6 - 13km S of Big Lake, Alaska"},"geometry":{"type":"Point","coordinates":[-149.982,61.4021,43.3]},"id":"ak01925qhp9v"},
{"type":"Feature","properties":{"mag":1.5,"place":"78km ENE of Cape Yakataga, Alaska","time":1550277129093,"updated":1550277301411,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak01925qg6tp","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak01925qg6tp.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":35,"net":"ak","code":"01925qg6tp","ids":",ak01925qg6tp,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.35,"gap":null,"magType":"ml","type":"earthquake","title":"M 1.5 - 78km ENE of Cape Yakataga, Alaska"},"geometry":{"type":"Point","coordinates":[-141.1985,60.4072,0.8]},"id":"ak01925qg6tp"},
{"type":"Feature","properties":{"mag":1.3,"place":"21km NNE of Badger, Alaska","time":1550276104117,"updated":1550276408063,"tz":-540,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/ak01925qcj9v","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ak01925qcj9v.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"automatic","tsunami":0,"sig":26,"net":"ak","code":"01925qcj9v","ids":",ak01925qcj9v,","sources":",ak,","types":",geoserve,origin,","nst":null,"dmin":null,"rms":0.42,"gap":null,"magType":"ml","type":"earthquake","title":"M 1.3 - 21km NNE of Badger, Alaska"},"geometry":{"type":"Point","coordinates":[-147.2898,64.9632,6.7]},"id":"ak01925qcj9v"},
{"type":"Feature","properties":{"mag":2.96,"place":"60km NNW of San Antonio, Puerto Rico","time":1550275421070,"updated":1550294471469,"tz":-240,"url":"https://earthquake.usgs.gov/earthquakes/eventpage/pr2019047002","detail":"https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/pr2019047002.geojson","felt":null,"cdi":null,"mmi":null,"alert":null,"status":"reviewed","tsunami":0,"sig":135,"net":"pr","code":"2019047002","ids":",pr2019047002,","sources":",pr,","types":",geoserve,origin,phase-data,","nst":4,"dmin":0.571,"rms":0.25,"gap":333,"magType":"md","type":"earthquake","title":"M 3.0 - 60km NNW of San Antonio, Puerto Rico"},"geometry":{"type":"Point","coordinates":[-67.2263,19.0268,7]},"id":"pr2019047002"}],"bbox":[-176.7088,-30.7399,-1.16,164.5151,69.5346,249.4]}
这些数据适合机器而不是人来读取。不过可以看到，这个文件包含一些字典，还有一些我们感兴趣的信息，如震级和位置。
模块json提供了各种探索和处理JSON数据的工具，其中一些有助于重新设置这个文件的格式，让我们能够更清楚地查看原始数据，继而决定如何以编程的方式来处理。
我们先加载这些数据并将其以易于阅读的方式显示出来。这个数据文件很长，因此不打印出来，而是将数据写入另一个文件，再打开该文件并轻松地在数据中导航：
首先导入模块json，以便恰当地加载文件中的数据，并将其存储到all_eq_data中。函数json.load()将数据转换为Python能够处理的格式，这里是一个庞大的字典。然后，创建一个文件，以便将这些数据以易于阅读的方式写入其中。函数json.dump()接受一个JSON数据对象和一个文件对象，并将数据写入这个文件中。参数indent=4让dump()使用与数据结构匹配的缩进量来设置数据的格式。
如果你现在查看目录data/并打开其中的文件readable_eq_data.json，将发现其开头部分像下面这样：
这个文件的开头是一个键为metadata的片段，指出了这个数据文件是什么时候生成的，以及能够在网上的什么地方找到。它还包含适合人类阅读的标题以及文件中记录了多少次地震：在过去的24小时内，发生了158次地震。
这个geoJSON文件的结构适合存储基于位置的数据。数据存储在一个与键"features"相关联的列表中。这个文件包含的是地震数据，因此列表的每个元素都对应一次地震。这种结构可能有点令人迷惑，但很有用，让地质学家能够将有关每次地震的任意数量信息存储在一个字典中，再将这些字典放在一个大型列表中。
我们来看看表示特定地震的字典：
{
"type": "Feature",
"properties": {
"mag": 0.96,
"place": "8km NE of Aguanga, CA",
"time": 1550360775470,
"updated": 1550360993593,
"tz": -480,
"url": "https://earthquake.usgs.gov/earthquakes/eventpage/ci37532978",
"detail": "https://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/ci37532978.geojson",
"felt": null,
"cdi": null,
"mmi": null,
"alert": null,
"status": "automatic",
"tsunami": 0,
"sig": 14,
"net": "ci",
"code": "37532978",
"ids": ",ci37532978,",
"sources": ",ci,",
"types": ",geoserve,nearby-cities,origin,phase-data,",
"nst": 32,
"dmin": 0.02648,
"rms": 0.15,
"gap": 37,
"magType": "ml",
"type": "earthquake",
"title": "M 1.0 - 8km NE of Aguanga, CA"
},
"geometry": {
"type": "Point",
"coordinates": [
-116.7941667,
33.4863333,
3.22
]
},
"id": "ci37532978"
},
键"properties"关联到了与特定地震相关的大量信息。我们关心的主要是与键“msg”相关联的地震震级以及地震的标题，因为后者很好地概述了地震的震级和位置。
键"geometry"指出了地震发生在什么地方，我们需要根据这项信息将地震在散点图上标出来。在与键"coordinates"相关联的列表中，可找到地震发位置的经度和纬度。
这个文件的嵌套层级比我们编写的代码多。如果这让你感到迷惑，也不用担心，Python将替你处理大部分复杂的工作。我们每次只会处理一两个嵌套层级。我们将首先提取24小时内发生的每次地震对应字典。
注意：说到位置时，我们通常先说经度、再说纬度，这种习惯形成的原因可能是人类先发现了纬度，很久后才有经度的概念。然而，很多地质学框架都先列出经度、后列出纬度，因为这与数学约定(x,y)。geoJSON格式遵循（经度、纬度）的约定，但在使用其他框架时，获悉其遵循的约定很重要。
3. 创建地震列表
首先，创建一个列表，其中包含所有地震的各种信息：
我们提取与键'features'相关联的数据，并将其存储到all_eq_dicts中。我们知道。这个文件记录了158次地震。下面的输出表明，我们提取了这个文件记录的所有地震：
注意，我们编写的代码很短。格式良好的文件readable_eq_data.json包含超过6000行内容，但只需几行代码，就可读取所有的数据并将其存储到一个Python列表中。下面将提取所有地震的震级。
4. 提取震级
有了包含所有地震数据的列表后，就可遍历这个列表，从中提取所需的数据。下面来提取每次地震的震级：
我们创建了一个空列表，用于存储地震震级，再遍历列表all_eq_dicts。每次地震的震级都存储在相应字典的'properties'部分的'mag'键下。我们依次将地震震级赋给变量mag，再将这个变量附加到列表mags末尾。
为确定提取的数据是否正确，打印前10次地震的震级：
接下来，我们将提取每次地震的位置信息，然后就可以绘制地震散点图了。
