打开.prj文件可以看到如下内容:
GEOGCS["WGS 84",
DATUM["World Geodetic System 1984",
SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4326"]]
“GEOGCS”表明其后紧随的“[]”中描述的是一个地理坐标系统。该坐标系统采用的大地基准面为“World Geodetic System 1984”,该基准面近似椭球体的长轴为6378137.0米、扁率为298.257223563。以格林威治0度经线为起始经线,地图单位为度,该单位的转换因子[2] 为0. 0174532925199433(π/180)
附(EPSG code ranges):
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