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:
Standards:
Would this be a welcomed addition? Any thoughts or feedback is appreciated.
Best regards / Vänliga hälsningar
Patrik Sylve
Software Developer
E: patrik.sy...@t-kartor.com
www.t-kartor.com
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