[gdal-dev] C#: Retrieve boundary of coordinate system

[Tomas R]

  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