This question already has an answer here:
- Difference between projection and datum? 11 answers
What is the difference between the Geographic coordinate, transformed coordinate(projected) ,cartesian coordinate, and screen coordinate? Is there a live example?
And what is the association between them? For example, on
geographic coordinate will have one or more
The following is a .prj file from this post:
PROJCS["Lambert Azimuthal Equal-Area", GEOGCS["GCS_WGS_1984", DATUM["D_WGS_1984", SPHEROID["WGS_1984", 6378137, 298.257223563]], PRIMEM["Greenwich", 0], UNIT["Degree", 0.017453292519943295]], PROJECTION["Lambert_Azimuthal_Equal_Area"], PARAMETER["false_easting", 0], PARAMETER["false_northing", 0], PARAMETER["latitude_of_origin", 0], PARAMETER["central_meridian", 20], PARAMETER["xy_plane_rotation", 0], UNIT["Meter", 1]]
Then what confused me is that
Lambert Azimuthal Equal-Area is the name of the projection coordinate system, and it specified the geographic coordinate system here(GCS_WGS_1984),why? Does it mean that this projection is only fit for the GCS_WGS_1984 geographic coordinate? As far as I understand, the projection have nothing to do with the geographics coordinate.
For example,given a geographics coordinate system
Now I can use different type of projection(like UTM, and Lambert Azimuthal Equal-Area in the post) to transfrom the geographics coordinate to projected coordinate. So the projection is not bounded with the geographics coordinate system. Isn't it?