地理信息
地理信息
遥感辐射传输模型
遥感科学的难点之一，要求数学功底极好
巧妇难为无米之炊
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坤舆万国全图
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视频地图推来搡去4000年
影像分辨率与比例尺换算
以2.5米影像为例，
1米影像 1:3779
屏幕 厘米/像素/PPI关系
以iPhone 4为例，屏幕分辨率960 × 640
屏幕对角线长度 3.5 英寸
附： 1英寸(in)=2.54厘米(cm)
WKID是Well-known ID的缩写，在ArcGIS二次开发中表示不同空间参考所对应的ID。
例如WKID=4214表示GCS_Beijing_1954这种空间参考。ArcGIS中对于空间参考的定义大约有三千多个，而与我们常用到的、与中国相关的只有一百多个，具体如下表所示：
ArcGIS中对于空间参考的定义大约有三千多个，而与我们常用到的、与中国相关的只有一百多个。具体如下表所示：完整版下载：WKID.xls
Geographic Coordinate System 地理坐标
| WKID号 | 地理参考 |
|---|---|
| 4214 | GCS_Beijing_1954 |
| 4326 | GCS_WGS_1984 |
| 4490 | GCS_China_Geodetic_Coordinate_System_2000 |
| 4555 | GCS_New_Beijing |
| 4610 | GCS_Xian_1980 |
Projected Coordinate System 投影坐标
| WKID号 | 地理参考 | WKID号 | 地理参考 | WKID号 | 地理参考 |
|---|---|---|---|---|---|
| 2327 | Xian_1980_GK_Zone_13 | 2349 | Xian_1980_3_Degree_GK_Zone_25 | 2370 | Xian_1980_3_Degree_GK_CM_75E |
| 2328 | Xian_1980_GK_Zone_14 | 2350 | Xian_1980_3_Degree_GK_Zone_26 | 2371 | Xian_1980_3_Degree_GK_CM_78E |
| 2329 | Xian_1980_GK_Zone_15 | 2351 | Xian_1980_3_Degree_GK_Zone_27 | 2372 | Xian_1980_3_Degree_GK_CM_81E |
| 2330 | Xian_1980_GK_Zone_16 | 2352 | Xian_1980_3_Degree_GK_Zone_28 | 2373 | Xian_1980_3_Degree_GK_CM_84E |
| 2331 | Xian_1980_GK_Zone_17 | 2353 | Xian_1980_3_Degree_GK_Zone_29 | 2374 | Xian_1980_3_Degree_GK_CM_87E |
| 2332 | Xian_1980_GK_Zone_18 | 2354 | Xian_1980_3_Degree_GK_Zone_30 | 2375 | Xian_1980_3_Degree_GK_CM_90E |
| 2333 | Xian_1980_GK_Zone_19 | 2355 | Xian_1980_3_Degree_GK_Zone_31 | 2376 | Xian_1980_3_Degree_GK_CM_93E |
| 2334 | Xian_1980_GK_Zone_20 | 2356 | Xian_1980_3_Degree_GK_Zone_32 | 2377 | Xian_1980_3_Degree_GK_CM_96E |
| 2335 | Xian_1980_GK_Zone_21 | 2357 | Xian_1980_3_Degree_GK_Zone_33 | 2378 | Xian_1980_3_Degree_GK_CM_99E |
| 2336 | Xian_1980_GK_Zone_22 | 2358 | Xian_1980_3_Degree_GK_Zone_34 | 2379 | Xian_1980_3_Degree_GK_CM_102E |
| 2337 | Xian_1980_GK_Zone_23 | 2359 | Xian_1980_3_Degree_GK_Zone_35 | 2380 | Xian_1980_3_Degree_GK_CM_105E |
| 2338 | Xian_1980_GK_CM_75E | 2360 | Xian_1980_3_Degree_GK_Zone_36 | 2381 | Xian_1980_3_Degree_GK_CM_108E |
| 2339 | Xian_1980_GK_CM_81E | 2361 | Xian_1980_3_Degree_GK_Zone_37 | 2382 | Xian_1980_3_Degree_GK_CM_111E |
| 2340 | Xian_1980_GK_CM_87E | 2362 | Xian_1980_3_Degree_GK_Zone_38 | 2383 | Xian_1980_3_Degree_GK_CM_114E |
| 2341 | Xian_1980_GK_CM_93E | 2363 | Xian_1980_3_Degree_GK_Zone_39 | 2384 | Xian_1980_3_Degree_GK_CM_117E |
| 2342 | Xian_1980_GK_CM_99E | 2364 | Xian_1980_3_Degree_GK_Zone_40 | 2385 | Xian_1980_3_Degree_GK_CM_120E |
| 2343 | Xian_1980_GK_CM_105E | 2365 | Xian_1980_3_Degree_GK_Zone_41 | 2386 | Xian_1980_3_Degree_GK_CM_123E |
| 2344 | Xian_1980_GK_CM_111E | 2366 | Xian_1980_3_Degree_GK_Zone_42 | 2387 | Xian_1980_3_Degree_GK_CM_126E |
| 2345 | Xian_1980_GK_CM_117E | 2367 | Xian_1980_3_Degree_GK_Zone_43 | 2388 | Xian_1980_3_Degree_GK_CM_129E |
| 2346 | Xian_1980_GK_CM_123E | 2368 | Xian_1980_3_Degree_GK_Zone_44 | 2389 | Xian_1980_3_Degree_GK_CM_132E |
| 2347 | Xian_1980_GK_CM_129E | 2369 | Xian_1980_3_Degree_GK_Zone_45 | 2390 | Xian_1980_3_Degree_GK_CM_135E |
| 2348 | Xian_1980_GK_CM_135E |
| WKID号 | 地理参考 | WKID号 | 地理参考 | WKID号 | 地理参考 |
|---|---|---|---|---|---|
| 2401 | Beijing_1954_3_Degree_GK_Zone_25 | 2422 | Beijing_1954_3_Degree_GK_CM_75E | 21413 | Beijing_1954_GK_Zone_13 |
| 2402 | Beijing_1954_3_Degree_GK_Zone_26 | 2423 | Beijing_1954_3_Degree_GK_CM_78E | 21414 | Beijing_1954_GK_Zone_14 |
| 2403 | Beijing_1954_3_Degree_GK_Zone_27 | 2424 | Beijing_1954_3_Degree_GK_CM_81E | 21415 | Beijing_1954_GK_Zone_15 |
| 2404 | Beijing_1954_3_Degree_GK_Zone_28 | 2425 | Beijing_1954_3_Degree_GK_CM_84E | 21416 | Beijing_1954_GK_Zone_16 |
| 2405 | Beijing_1954_3_Degree_GK_Zone_29 | 2426 | Beijing_1954_3_Degree_GK_CM_87E | 21417 | Beijing_1954_GK_Zone_17 |
| 2406 | Beijing_1954_3_Degree_GK_Zone_30 | 2427 | Beijing_1954_3_Degree_GK_CM_90E | 21418 | Beijing_1954_GK_Zone_18 |
| 2407 | Beijing_1954_3_Degree_GK_Zone_31 | 2428 | Beijing_1954_3_Degree_GK_CM_93E | 21419 | Beijing_1954_GK_Zone_19 |
| 2408 | Beijing_1954_3_Degree_GK_Zone_32 | 2429 | Beijing_1954_3_Degree_GK_CM_96E | 21420 | Beijing_1954_GK_Zone_20 |
| 2409 | Beijing_1954_3_Degree_GK_Zone_33 | 2430 | Beijing_1954_3_Degree_GK_CM_99E | 21421 | Beijing_1954_GK_Zone_21 |
| 2410 | Beijing_1954_3_Degree_GK_Zone_34 | 2431 | Beijing_1954_3_Degree_GK_CM_102E | 21422 | Beijing_1954_GK_Zone_22 |
| 2411 | Beijing_1954_3_Degree_GK_Zone_35 | 2432 | Beijing_1954_3_Degree_GK_CM_105E | 21423 | Beijing_1954_GK_Zone_23 |
| 2412 | Beijing_1954_3_Degree_GK_Zone_36 | 2433 | Beijing_1954_3_Degree_GK_CM_108E | 21473 | Beijing_1954_GK_Zone_13N |
| 2413 | Beijing_1954_3_Degree_GK_Zone_37 | 2434 | Beijing_1954_3_Degree_GK_CM_111E | 21474 | Beijing_1954_GK_Zone_14N |
| 2414 | Beijing_1954_3_Degree_GK_Zone_38 | 2435 | Beijing_1954_3_Degree_GK_CM_114E | 21475 | Beijing_1954_GK_Zone_15N |
| 2415 | Beijing_1954_3_Degree_GK_Zone_39 | 2436 | Beijing_1954_3_Degree_GK_CM_117E | 21476 | Beijing_1954_GK_Zone_16N |
| 2416 | Beijing_1954_3_Degree_GK_Zone_40 | 2437 | Beijing_1954_3_Degree_GK_CM_120E | 21477 | Beijing_1954_GK_Zone_17N |
| 2417 | Beijing_1954_3_Degree_GK_Zone_41 | 2438 | Beijing_1954_3_Degree_GK_CM_123E | 21478 | Beijing_1954_GK_Zone_18N |
| 2418 | Beijing_1954_3_Degree_GK_Zone_42 | 2439 | Beijing_1954_3_Degree_GK_CM_126E | 21479 | Beijing_1954_GK_Zone_19N |
| 2419 | Beijing_1954_3_Degree_GK_Zone_43 | 2440 | Beijing_1954_3_Degree_GK_CM_129E | 21480 | Beijing_1954_GK_Zone_20N |
| 2420 | Beijing_1954_3_Degree_GK_Zone_44 | 2441 | Beijing_1954_3_Degree_GK_CM_132E | 21481 | Beijing_1954_GK_Zone_21N |
| 2421 | Beijing_1954_3_Degree_GK_Zone_45 | 2442 | Beijing_1954_3_Degree_GK_CM_135E | 21482 | Beijing_1954_GK_Zone_22N |
| 3395 | WGS_1984_World_Mercator | 21483 | Beijing_1954_GK_Zone_23N |
