Global Coordinates Set (UTM Vs Geo)

I got the impression from other programmers that GEO (wgs84) coordinates are not efficient for calculating distance at meters resulotion. My Goal is to calcul开发者_如何学编程ate accuratly (meters) distance between 2 points (at the same country) by using global coordinates (UTM Or Geodetic(wgs84)) ,in which set of global coordinates you recomand to use ??

thanks, Liran.

To achieve high precision in your calculations you should convert coordinates from WGS84 to country's local coordinate system. If you tell what country it is I could probably give a hint on what coordinate system is appropriate.

UPDATE: This coordinate system should work well for Israel. If you are using .NET you can use Proj.NET to convert coordinates. You will need a projection string for this coordinate system and it can be found here - look for OGC WKT. This long string should be sent as the parameter in one of Proj.NET's methods.