Nikos Alexandris wrote: > > Alternative solution with respect to the specific example here: allow > > g.copy to copy data from another dbase/location to the current dbase in > > a location with identical name and projection definition of course (?).
Glynn Clements: > We don't currently have any way to check whether two projections are > identical, and this isn't a trivial question. E.g.: > > 1. Some of the parameters are floating-point values, so we would need > to choose some kind of tolerance. > > 2. Are WGS84 and NAD83 the same? In the absence of grid shift files, > the only difference is that the eccentricity of the WGS84 and GRS80 > ellipsoids differ by 1.5e-6. > > 3. If the projections use grid shift files, do we just check that they > use the same file, or do we compare their contents? Seems not that easy after all. As a simple user I would expect that (at least?) locations created using 'epsg:4326' would be easy to compare/identify. Nikos _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user