
Did sharpmap support to convert WGS84 coordinate to UTM


Developer
Oct 18, 2006 at 6:25 AM

Thats like converting apples to oranges...
You are mixing up datums and coordinate systems.


Coordinator
Oct 18, 2006 at 8:29 PM

Right...
WGS84 is a model of how the earth is shaped, and how, given any two points on the earth, you can calculate a third. This is not exactly an easy problem, since the earth is a sqashed sphere  an oblate ellipsoid (or, more technically, a geoid, with an irregular
surface).
UTM flattens out this roundish model into 60 strips going from 80 degrees south to 84 degrees north (the poles are excluded since equatorial projections get wierd up there). These strips are known as a projection, since it transforms a 3D shape into a 2D shape
for mapping.
So, simplifying matters greatly, WGS 84 is the model of the earth as an ellipsoid, and UTM is a projection of that shape into flat strips.
(Note: UTM is a method of projection, so it doesn't need to use the WGS 84 datum. In the US, for example, it uses the Clarke 1866 spheroid. Also you can use other projections on the WGS 84 datum)

