百度地图坐标转换API和地图API
利用百度地图的服务将经纬度转换为米单位坐标
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.IO; using System.Diagnostics; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { double[,] LonLat = new double[2, 2] { { 114.21892734521, 29.575429778924 }, { 114.21892734521, 29.575429778924 } }; string url = string.Format("http://api.map.baidu.com/geoconv/v1/?coords={0},{1};{2},{3}&from=1&to=6&ak=你的密钥", LonLat[0,0], LonLat[0,1], LonLat[1,0], LonLat[1,1]); string res = SendRequest(url, Encoding.UTF8); Debug.WriteLine(res); int x = res.IndexOf("\"x\":"); int y = res.IndexOf("\"y\":"); int endy = res.IndexOf("}"); string xx = res.Substring(x+ 4, y - x - 5); string yy = res.Substring(y + 4, endy - y-4); Console.Write(xx+"米 "); Console.WriteLine(yy + "米 "); x = res.IndexOf("\"x\":", x+3); y = res.IndexOf("\"y\":",y+3); endy = res.IndexOf("}",endy+3); xx = res.Substring(x + 4, y - x - 5); yy = res.Substring(y + 4, endy - y - 4); Console.Write(xx+"米 "); Console.WriteLine(yy + "米"); } /// <summary> /// Get方式获取url地址输出内容 /// </summary> /// <param name="url">url</param> /// <param name="encoding">返回内容编码方式，例如：Encoding.UTF8</param> public static String SendRequest(String url, Encoding encoding) { HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url); webRequest.Method = "GET"; HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse(); StreamReader sr = new StreamReader(webResponse.GetResponseStream(), encoding); return sr.ReadToEnd(); } } }
结果：
官方开发说明：http://developer.baidu.com/map/changeposition.htm
获取密钥：http://lbsyun.baidu.com/apiconsole/key
我自己的密钥：http://lbsyun.baidu.com/apiconsole/key
http://developer.baidu.com/map/jsdemo.htm#a1_2
利用密钥还建立了一个显示地图的网页
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> <style type="text/css"> body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;font-family:"微软雅黑";} </style> <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=密钥"></script> <title>地图展示</title> </head> <body> <div id="allmap"></div> </body> </html> <script type="text/javascript"> // 百度地图API功能 var map = new BMap.Map("allmap"); // 创建Map实例 map.centerAndZoom(new BMap.Point(116.404, 39.915), 11); // 初始化地图,设置中心点坐标和地图级别 map.addControl(new BMap.MapTypeControl()); //添加地图类型控件 map.setCurrentCity("北京"); // 设置地图显示的城市 此项是必须设置的 map.enableScrollWheelZoom(true); //开启鼠标滚轮缩放 </script>
一个有关地图的开源项目：
http://greatmaps.codeplex.com/SourceControl/latest
百度地图09坐标转wgs84坐标
1.百度09坐标转火星坐标系
2.火星坐标系转wgs84坐标系
/// <summary> /// 地球坐标系 (WGS-84) 到火星坐标系 (GCJ-02) 的转换 帮助类 /// </summary> public static class WGSGCJLatLonHelper { /* *参考： *1.http://blog.csdn.net/yorling/article/details/9175913 *2.http://kongxz.com/2013/10/wgs-cgj/ *3.https://on4wp7.codeplex.com/SourceControl/changeset/view/21483#EvilTransform.cs *4.https://github.com/googollee/eviltransform *5.https://github.com/shenqiliang/WGS2Mars * *WGS84:World Geodetic System 1984，是为GPS全球定位系统使用而建立的坐标系统。通过遍布世界的卫星观测站观测到 *的坐标建立，其初次WGS84的精度为1-2m，在1994年1月2号，通过10个观测站在GPS测量方法上改正，得到了WGS84 *（G730），G表示由GPS测量得到，730表示为GPS时间第730个周。1996年，National Imagery and Mapping Agency (NIMA) *为美国国防部 (U.S.Departemt of Defense, DoD)做了一个新的坐标系统。这样实现了新的WGS版本：WGS（G873）。其因为 *加入了USNO站和北京站的改正，其东部方向加入了31-39cm 的改正。所有的其他坐标都有在1分米之内的修正。 * *GCJ-02:国家保密插件，也叫做加密插件或者加偏或者SM模组，其实就是对真实坐标系统进行人为的加偏处理，按照几行代码的算 *法，将真实的坐标加密成虚假的坐标，而这个加偏并不是线性的加偏，所以各地的偏移情况都会有所不同。而加密后的坐标也常 *被人称为火星坐标系统。GCJ-02 意味“国测局-2002”，也就是说，这是国家测绘局于2002年弄出的标准。 */ #region 常量以及私有方法 const double pi = 3.14159265358979324;//Math.PI;//; const double a = 6378245.0; const double ee = 0.00669342162296594323; private static double TransformLat(double lonX, double latY) { double _ret = -100.0 + 2.0 * lonX + 3.0 * latY + 0.2 * latY * latY + 0.1 * lonX * latY + 0.2 * Math.Sqrt(Math.Abs(lonX)); _ret += (20.0 * Math.Sin(6.0 * lonX * pi) + 20.0 * Math.Sin(2.0 * lonX * pi)) * 2.0 / 3.0; _ret += (20.0 * Math.Sin(latY * pi) + 40.0 * Math.Sin(latY / 3.0 * pi)) * 2.0 / 3.0; _ret += (160.0 * Math.Sin(latY / 12.0 * pi) + 320 * Math.Sin(latY * pi / 30.0)) * 2.0 / 3.0; return _ret; } private static double TransformLon(double lonX, double latY) { double _ret = 300.0 + lonX + 2.0 * latY + 0.1 * lonX * lonX + 0.1 * lonX * latY + 0.1 * Math.Sqrt(Math.Abs(lonX)); _ret += (20.0 * Math.Sin(6.0 * lonX * pi) + 20.0 * Math.Sin(2.0 * lonX * pi)) * 2.0 / 3.0; _ret += (20.0 * Math.Sin(lonX * pi) + 40.0 * Math.Sin(lonX / 3.0 * pi)) * 2.0 / 3.0; _ret += (150.0 * Math.Sin(lonX / 12.0 * pi) + 300.0 * Math.Sin(lonX / 30.0 * pi)) * 2.0 / 3.0; return _ret; } private static MyPoint Transform(MyPoint point) { MyPoint _transPoint = new MyPoint(); double _lat = TransformLat(point.LonX - 105.0, point.LatY - 35.0); double _lon = TransformLon(point.LonX - 105.0, point.LatY - 35.0); double _radLat = point.LatY / 180.0 * pi; double _magic = Math.Sin(_radLat); _magic = 1 - ee * _magic * _magic; double _sqrtMagic = Math.Sqrt(_magic); _lat = (_lat * 180.0) / ((a * (1 - ee)) / (_magic * _sqrtMagic) * pi); _lon = (_lon * 180.0) / (a / _sqrtMagic * Math.Cos(_radLat) * pi); _transPoint.LatY = _lat; _transPoint.LonX = _lon; return _transPoint; } #endregion #region 火星坐标转 (GCJ-02)地球坐标(WGS-84) /// <summary> /// 火星坐标转 (GCJ-02)地球坐标(WGS-84) /// </summary> /// <param name="gcjPoint">火星坐标转 (GCJ-02)</param> /// <returns>地球坐标(WGS-84)</returns> public static MyPoint GCJ02ToWGS84(MyPoint gcjPoint) { if (outOfChina(gcjPoint)) { return gcjPoint; } MyPoint _transPoint = Transform(gcjPoint); return new MyPoint(gcjPoint.LatY - _transPoint.LatY, gcjPoint.LonX - _transPoint.LonX); } #endregion #region 地球坐标(WGS-84)转火星坐标 (GCJ-02) /// <summary> /// 地球坐标(WGS-84)转火星坐标 (GCJ-02) /// </summary> /// <param name="wgsPoint">地球坐标(WGS-84)</param> /// <returns>火星坐标 (GCJ-02)</returns> public static MyPoint WGS84ToGCJ02(MyPoint wgsPoint) { if (outOfChina(wgsPoint)) { return wgsPoint; } MyPoint _transPoint = Transform(wgsPoint); return new MyPoint(wgsPoint.LatY + _transPoint.LatY, wgsPoint.LonX + _transPoint.LonX); } #endregion #region 火星坐标系转百度坐标系 public static MyPoint GCJ02ToBD09(MyPoint gcjpoint) { double x = gcjpoint.LonX, y = gcjpoint.LatY; double z =Math.Sqrt(x * x + y * y) + 0.00002 * Math.Sin(y * pi); double theta =Math.Atan2(y, x) + 0.000003 *Math.Cos(x * pi); double bd_lon = z * Math.Cos(theta) + 0.0065; double bd_lat = z * Math.Sin(theta) + 0.006; return new MyPoint(bd_lat + 0.006, bd_lon); } #endregion #region 百度坐标系转火星坐标系 public static MyPoint BD09ToGCJ02(MyPoint bdpoint) { double x = bdpoint.LonX - 0.0065, y = bdpoint.LatY - 0.006; double z = Math.Sqrt(x * x + y * y) - 0.00002 * Math.Sin(y * pi); double theta = Math.Atan2(y, x) - 0.000003 * Math.Cos(x * pi); double gg_lon = z * Math.Cos(theta); double gg_lat = z * Math.Sin(theta); return new MyPoint(gg_lat, gg_lon); } #endregion #region 百度坐标转GPS坐标 public static MyPoint BD09ToWGS84(MyPoint bdpoint) { MyPoint gcj02 = BD09ToGCJ02(bdpoint); MyPoint wgs84 = GCJ02ToWGS84(gcj02); return wgs84; } #endregion private static bool outOfChina(MyPoint pt) { if (pt.LonX < 72.004 || pt.LonX > 137.8347) return true; if (pt.LatY < 0.8293 || pt.LatY > 55.8271) return true; return false; } } public class MyPoint { public double LonX { get; set; } public double LatY { get; set; } public MyPoint(double latY, double lonX) { LatY = latY; LonX = lonX; } public MyPoint() { } }
