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本帖最后由 听风者 于 2013-5-31 12:36 编辑
坐标系可粗略地分为两大类:大地坐标系(Geographic Coordinate System,GCS)和投影坐标系(Projected Coordinate System,PCS)。常用大地坐标系与wkid对照如下:
(1)4326:GCS_WGS_1984
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
(2)4214:GCS_Beijing_1954
GEOGCS["GCS_Beijing_1954",DATUM["D_Beijing_1954",SPHEROID["Krasovsky_1940",6378245.0,298.3]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
(3)4610:GCS_Xian_1980
GEOGCS["GCS_Xian_1980",DATUM["D_Xian_1980",SPHEROID["Xian_1980",6378140.0,298.257]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
更多详情参考:http://blog.csdn.net/jixg1800/article/details/7638586 |
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