|Project geographic features to map coordinates|
|Unproject features from map to geographic coordinates|
|Forward map projection using PROJ.4 map projection library|
|Inverse map projection using PROJ.4 map projection library|
Latitude and longitude specify the position of a point on the surface of a planet. They are defined as angles between the point, the equator, and the axis of rotation.
You can redefine a coordinate system and transform all points to the new coordinate system. The transformation can be useful independent of map displays.