Hi,
I built gdal 1.7.2 with PAM support disabled by default, and found that I could
no longer build overviews for many formats. When I set the environment
variable GDAL_PAM_ENABLED=YES, the overviews would build. I traced the problem
down to the following section of GDALPamDataset::IBuildOverviews in
gdalpamdataset.cpp:
PamInitialize();
if( psPam == NULL )
return CE_None;
When I replaced this with:
PamInitialize();
if( psPam == NULL )
return GDALDataset::IBuildOverviews( pszResampling,
nOverviews, panOverviewList,
nListBands, panBandList,
pfnProgress, pProgressData );
The overviews built again. However, I don't know much about PAM and haven't
ever worked with it enabled (aside from the current troubleshooting effort), so
I don't know if this change would mess things up in some cases when PAM is
enabled.
Is the above change OK, or should I also be adding a check that pszPamDefault
is set to "NO", or something along those lines?
Thanks,
Gillian Walter
Software Developer
Geospatial Services Inc.
57 Auriga Drive - Suite 201
Ottawa, ON K2E 8B2
Telephone: (613) 727-1087 #245
Facsimile: (613) 727-5853
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