[Gdal-dev] writing RPC data in NITF format?

[Frank Warmerdam]

Sarah Mulholland wrote:
> I have a NITF image and RPC data in a separate file.  I need to embed 
> the RPC data in the NITF file.  I see that there's a GDALExtractRPCInfo 
> function.  Would it be straightforward to create a GDALInsertRPCInfo so 
> that I can perform the following steps:
> 
> 1. populate a GDALRPCInfo object with the RPC values
> 2. read the NITF image into a GDAL data set
> 3. insert the RPC information
> 4. write the result to a NITF file
> 
> Is this straightforward to do?

Sarah,

I'm not convinced that it would be all that easy.  Currently the
GDAL NITF writer does not write any TREs (extensions) so a bunch of
machinery would need to be added.  My next concern would be that we
are still not producing a proper "product" matching an existing product
specification though that might not really matter.

One option you might want to look into is writing NITFs with RPCs using
OSSIM.  Generally speaking, I think the OSSIM folks have been doing more
indepth NITF support than I do in GDAL.  I don't really want to replicate
all the more exotic stuff they do.

But of course, if it is important enough to you, it can be accomplished.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGF, http://osgeo.org