[gdal-dev] Retrieving Sub Datasets from an RPF's A.TOC file

[Even Rouault]

Doug,

you might try defining the RPFTOC_FORCE_RGBA envirnoment variable/config option 
to YES. This should avoid GDALOpen'ing all the tiles at dataset creation. 
However the presence of all tiles will be checked via a 'stat' call, which can 
still be a potential bottleneck. That could probably be disabled with some 
code changes (the code would then assume that all declared tiles are 
effectively present on the disk).

Even

> When retrieving a sub dataset from GDAL using GDALOpen() and expressing the
> file path as  "NITF_TOC_ENTRY:CADRG_TLM50_50K_2_18:C:/rpf/a.toc "  there
> is a considerable delay.  This delay is acceptable if the RFP's coverage
> is for the United States, but if the coverage is for the world then it
> becomes a problem.
> 
> Is there a different way that I should be working with RPF (CADRG) within
> the GDAL framework or should I move on to something like OSSIM?
> 
> Thanks for any help you can give,
> 
> Doug
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