[gdal-dev] [PROPOSAL] Add CADRG write support via RPFTOC/NITF drivers

[Even Rouault]

Hi,


as an update of that thread, the below plan has now come true per 
https://github.com/OSGeo/gdal/pull/13940


Even


Le 11/06/2025 à 14:51, Patrik Sylve via gdal-dev a écrit :
> Hi,
>
> We are exploring the possibility of adding write support for CADRG 
> format in GDAL and would appreciate some community feedback before 
> starting implementation.
>
> There is currently no open-source workflow for creating CADRG. GDAL 
> can already read CADRG via RPFTOC/NITF drivers, so extending that work 
> feels like a good next step.
>
>
> Short background on CADRG format:
>
> CADRG is a Raster Product Format (RPF) that consists of a TOC file 
> referencing data frames. Each data frame is stored as a National 
> Imagery Transmission Format (NITF) message.
>
> GDAL currently supports:
>
> * Reading CADRG (a.toc) via the RPFTOC driver
> * Reading individual CADRG frames via the NITF driver
> * Writing NITF images, both without and with JPEG compression
>
>
> To implement a CADRG writer, we could extend the existing NITF and 
> RPFTOC drivers:
>
> NITF:
> * Implement Vector Quantisation compression
> * Add option to set Frame size
> ** A CADRG frame must be 1536x1536 pixels, so output would be tiled
> * Add option to set CADRG scale
>
> RPFTOC:
> * Extend with 'write' mode
> ** Internally call NITF driver to generate CADRG compliant data frames
> ** Generate a .toc file per MIL-STD-2411
>
> Example usage, create a CADRG from a TIF-file:
>
> gdal_translate input.tif ./RPF \
>     -of RPFTOC \
>      -co "PRODUCT=CADRG" \
> *    # NITF file header options*
>     -co "FTITLE=My CADRG Product" \
>     -co "FSCLAS=U" \
>          ...
>
> Output:
> └── RPF/
> ├─── a.toc
> └─── frames/
> ├──── 00AVL01C.TL6
> └──── 00AVM01C.TL6
>
>
>
> Drivers:
> * https://gdal.org/en/stable/drivers/raster/rpftoc.html
> * https://gdal.org/en/stable/drivers/raster/nitf.html
>
> Standards:
> * CADRG: 
> http://everyspec.com/MIL-PRF/MIL-PRF-080000-99999/MIL-PRF-89038_25371/
> * RPF: http://everyspec.com/MIL-STD/MIL-STD-2000-2999/MIL-STD-2411_6903/
>
>
> Would this be a welcomed addition? Any thoughts or feedback is 
> appreciated.
>
>
> Best regards / Vänliga hälsningar
>
>
> *Patrik Sylve*
>
> Software Developer
>
> *
> *
>
> *E:***patrik.sylve at t-kartor.com
>
>
> www.t-kartor.com <http://www.t-kartor.com/>
>
>
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