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| author | Kristian Evers <kristianevers@gmail.com> | 2019-02-11 23:58:16 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-02-11 23:58:16 +0100 |
| commit | 5141b3908e59a26c9fe66de94bb7388bff741b58 (patch) | |
| tree | 9cf9a136c9dd72e2732ed38470b6c84b558f4b73 /docs/source/operations/projections/utm.rst | |
| parent | 593fcc4b57d0f5c3a46134add142ee8d9316aec6 (diff) | |
| download | PROJ-5141b3908e59a26c9fe66de94bb7388bff741b58.tar.gz PROJ-5141b3908e59a26c9fe66de94bb7388bff741b58.zip | |
Make tmerc an alias for etmerc. (#1234)
* 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>
Diffstat (limited to 'docs/source/operations/projections/utm.rst')
| -rw-r--r-- | docs/source/operations/projections/utm.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/source/operations/projections/utm.rst b/docs/source/operations/projections/utm.rst index ac65aa1a..8759f4eb 100644 --- a/docs/source/operations/projections/utm.rst +++ b/docs/source/operations/projections/utm.rst @@ -66,6 +66,12 @@ Required Add this flag when using the UTM on the southern hemisphere. +.. option:: +approx + + .. versionadded:: 6.0.0 + + Use faster, less accurate algorithm for the Transverse Mercator. + Optional ------------------------------------------------------------------------------- |