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builds only (CMake integration to be done)
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and add catch2 framework
Hardened compilation flags come from GDAL' configure.ac and are
'combat proven'
Dummy test added just to demonstrate catch2 based tests work.
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Following PR #806 which removed various grids from nad/, we now have
to download the BETA2007 grid before that DHDN_ETRS89 test can pass
successfully.
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The GIGS tests that are known to work are added to the CMake test
setup. The GIGS gie files have been auto-translated from the
existing json-files and some corrections to tolerances have been
necessary since gie uses different norms than GIGS specify. The GIGS
tolerances are specified as the infinity norm of angular coordinates,
whereas gie uses the actual distances between calculated and expected
coordinates (using geodesics). In a few tests +towgs84 is overriden
from the EPSG inits to avoid creeping numerical inaccuracy in
roundtrips.
Co-authored-by: Thomas Knudsen <thokn@sdfe.dk>
Co-authored-by: Kristian Evers <kristianevers@gmail.com>
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