Coordinate Systems

Discussion created by mikewhite58 on Mar 6, 2013
Latest reply on Mar 6, 2013 by mikewhite58
hey everyone,

I was wondering if someone could shine some light on an issue I am having with ARC. Yesterday I produced some maps of the North Sea area but depending on which Map Coordinate System I used, I had differnt results. The first Map I had produced was with a Coordinate System of WGS 84 Web Mercator. This Map was showing a distance of approx 1100km from Scotland to Norway. The second map I produced had a Coordinate system of Nad 83, UTM z31. This Map had a distance of approx 550km from scotland to Norway, which appears to be correct.

So the question remains as to why the huge difference. i'm thinking its related to the broad use of WGS84 in the first map and Not zoning in on a particlar UTM Zone? i.e, if I had used WGS84 Z31, then the map would have been correct. If someone could help explain this issue to me it would be greatly appreciated.

Thanks for your time