I think the EPSG dictionary defines areas of validity for the defined coordinate systems. That could be a starting point, although there may be a better solution
-Francis On 8 July 2010 16:01, Tomas R <[email protected]> wrote: > No one? > > Ok, I guess then that there are no common function/method of doing this. My > approach will the be trial and error. From WGS 84 transform to the local > coordinate system and back again to WGS84 and check if the result seems > valid. > > Should work or any expert here have another solution? > > Yours > Tomas > > Tomas R skrev 2010-07-05 09:05: >> >> Attacking GDAL via the C# interface and I have a question >> >> Have set up two (Osr) SpatialReferences and transformations to and form >> both. One system is WGS84 and the other is unknown. >> >> To get a consistent behaviour I need to retrieve the boundary, in WGS84 >> coordinates, of the unknown system. If known I can fallback on WGS84 when >> calls outside the scope of the coordinates system are made. >> Should be easy to read of some attribute of the SpatialReference or >> alike. But which/how? >> >> Any suggestions? >> >> Or how should I solve it - in general words: >> My application maps coordinates from and to WGS84 and serves them to >> another via calls like PixelToGPS and GPSToPixel. The originating coordinate >> system is always WGS84. Need to handle calls made outside the scope of the >> coordinate system and my approach, to get a consisting behaviour of the two >> functions, is to revert to WGS84 which is defined at all possible points. >> >> >> Yours >> Tomas > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
