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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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