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there is no direct transformation
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PJ object returned by proj_create_crs_to_crs() when there are several alternatives
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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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This method is intended to be used typically by GUI that lists all possible CRS.
What is does could be done by previously existing functions, but it is much faster.
It typically runs in less than 0.1s (hot run) versus ~0.5s with the method that
consists in enumerating all codes and instanciating a PJ object for each of them.
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until proj_trans() is called (fixes #1229)
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make proj_create() do more or less what proj_create_from_user_input() did before (fixes #1214)
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simplified version of it
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is disabled
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not possible
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proj_trans() and similar methods
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projections/ transformations/ tests/ subdirectories
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