On Mon, Jun 28, 2004 at 06:48:23AM -0400, IvorW wrote:

I thought that you needed different ellipsoids for different parts of the globe. wgs84 or nad83 may work well for California, but I doubt if they would for Europe.

no, wgs84 is a global model. streetmap.co.uk gives you lat and long back in wgs84. you need to worry about the different archaic reference datums used in different countries grid projections only when projecting geodata onto flat maps that are already georeferenced according to the other projection.

UTM is where this makes a difference for different countries grid systems - i wouldn't know my own local mapping agency projection, though...

i would send a link with better metainfo but have to run...

zx