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.sy...@t-kartor.com www.t-kartor.com<http://www.t-kartor.com/> [cid:465b82b6-444d-4563-8536-8b9cd3b0e8df] This e-mail is private and confidential between the sender and the addressee. In the event of misdirection, the recipient is prohibited from using, copying or disseminating it or any information in it. Please notify the above of any such misdirection.
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