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* Make tmerc an alias for etmerc
This switches the algorithm used in tmerc to the Poder/Engsager
tmerc algorithm. The original tmerc algorithm of Evenden/Snyder
origin can still be accessed by adding the +approx flag when
initializing a tmerc projection. The +approx flag can also
be used when initializing UTM projections, in which case the
Evenden/Snyder algorithm is used as well.
If a tmerc projection is instantiated on a spherical earth
the Evenden/Snyder algorithm is used as well since the
Poder/Engsager algorithm is only defined on the ellipsoid.
+proj=etmerc can still be instantiated for backwards compatibility
reasons.
Co-authored-by: Kristian Evers <kristianevers@gmail.com>
Co-authored-by: Even Rouault <even.rouault@spatialys.com>
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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12849. Credit to OSS Fuzz
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This communicates better what the unit actually is. It also opens the
door for potentially adding PJ_IO_UNITS_DEGREES in the future in order
to coordinates in degrees correctly as well.
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structures
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projections/ transformations/ tests/ subdirectories
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