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2018-11-20Database: use official IGNF.xml registry to create content from the IGNF ↵Even Rouault
authority Up to now, we re-processed the data/IGNF PROJ.4 definition to ingest it into proj.db, but this file originally come from a processing of IGNF.xml ( http://librairies.ign.fr/geoportail/resources/IGNF.xml ) The end result is not strictly equivalent, as data/IGNF has some 'magic' to create towgs84 / nadgrids, since IGNF.xml doesn't necessary contain all transformations from its geodetic systems to WGS84. I've tried to re-add some of those missing transforms (null Helmert transforms), so it can be used for pivoting, but that might be incomplete.
2018-11-14Implement RFC 2: Initial integration of "GDAL SRS barn" workEven Rouault
This work mostly consists of: - a C++ implementation of the ISO-19111:2018 / OGC Topic 2 "Referencing by coordinates" classes to represent Datums, Coordinate systems, CRSs (Coordinate Reference Systems) and Coordinate Operations. - methods to convert between this C++ modeling and WKT1, WKT2 and PROJ string representations of those objects - management and query of a SQLite3 database of CRS and Coordinate Operation definition - a C API binding part of those capabilities This is all-in-one squashed commit of the work of https://github.com/OSGeo/proj.4/pull/1040