[Liblas-devel] LAS 1.2 and SRS improvements

[Howard Butler]

All,

I think the dust has finally settled on a number of improvements I've  
made to the SRS handling.  Right now, only the C++ code has been  
changed, but I plan to implement C and Python API for it in the next  
couple of days as well.  Here's a summary of the changes:

- a new class, LASSRS has been created.  It is instantiated with a  
list of VLRs, and if any of those VLRs are GeoTIFF-key related, they  
are copied into the LASSRS.
- if neither libgeotiff nor GDAL are compiled in, the LASSRS is  
supposed to do nothing.
- if GDAL is compiled in, it is used for SRS translation from the  
GeoTIFF keys
- otherwise, if libgeotiff is available, but not GDAL, it is used as  
before

One problem I would like some ideas on is how to describe what is  
available.  Because the SRS handling can be so different depending on  
what is available, I think it would be good for us to allow the user  
to ask what was activated at compile time?  Any thoughts on how to do  
so?  Other than static strings, which might cause cross-dll heap  
troubles, the only other approach I could think of is something like  
MapServer's:

http://trac.osgeo.org/mapserver/browser/trunk/mapserver/maperror.c#L490

but it seems like a crime against nature ;)

Please give trunk a test and let me know if you have any troubles with  
it.  LAS 1.2 read/write support should also be active now, and 1.2 is  
now the default version when creating new files, etc.

Howard