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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 | |
| 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')
| -rw-r--r-- | docs/source/operations/projections/etmerc.rst | 32 | ||||
| -rw-r--r-- | docs/source/operations/projections/images/etmerc.png | bin | 222004 -> 0 bytes | |||
| -rw-r--r-- | docs/source/operations/projections/index.rst | 1 | ||||
| -rw-r--r-- | docs/source/operations/projections/tmerc.rst | 8 | ||||
| -rw-r--r-- | docs/source/operations/projections/utm.rst | 6 |
5 files changed, 13 insertions, 34 deletions
diff --git a/docs/source/operations/projections/etmerc.rst b/docs/source/operations/projections/etmerc.rst deleted file mode 100644 index 2a007130..00000000 --- a/docs/source/operations/projections/etmerc.rst +++ /dev/null @@ -1,32 +0,0 @@ -.. _etmerc: - -******************************************************************************** -Extended Transverse Mercator -******************************************************************************** - -.. figure:: ./images/etmerc.png - :width: 500 px - :align: center - :alt: Extended Transverse Mercator - - proj-string: ``+proj=etmerc +lon_0=-40`` - -Parameters -################################################################################ - -.. note:: All parameters for the projection are optional. - -.. include:: ../options/lon_0.rst - -.. include:: ../options/lat_0.rst - -.. include:: ../options/ellps.rst - -.. include:: ../options/R.rst - -.. include:: ../options/k_0.rst - -.. include:: ../options/x_0.rst - -.. include:: ../options/y_0.rst - diff --git a/docs/source/operations/projections/images/etmerc.png b/docs/source/operations/projections/images/etmerc.png Binary files differdeleted file mode 100644 index 35bce083..00000000 --- a/docs/source/operations/projections/images/etmerc.png +++ /dev/null diff --git a/docs/source/operations/projections/index.rst b/docs/source/operations/projections/index.rst index 572deb1a..e6ec9076 100644 --- a/docs/source/operations/projections/index.rst +++ b/docs/source/operations/projections/index.rst @@ -43,7 +43,6 @@ Projections map the spherical 3D space to a flat 2D space. eqdc eqearth euler - etmerc fahey fouc fouc_s diff --git a/docs/source/operations/projections/tmerc.rst b/docs/source/operations/projections/tmerc.rst index 6d1c145d..fd600001 100644 --- a/docs/source/operations/projections/tmerc.rst +++ b/docs/source/operations/projections/tmerc.rst @@ -68,13 +68,19 @@ Example using Gauss-Kruger on Germany area (aka EPSG:31467) :: Example using Gauss Boaga on Italy area (EPSG:3004) :: $ echo 15 42 | proj +proj=tmerc +lat_0=0 +lon_0=15 +k_0=0.9996 +x_0=2520000 +y_0=0 +ellps=intl +units=m +no_defs - 2520000.00 4649858.60 + 2520000.00 4649858.60 Parameters ################################################################################ .. note:: All parameters for the projection are optional. +.. option:: +approx + + .. versionadded:: 6.0.0 + + Use faster, less accurate algorithm for the Transverse Mercator. + .. include:: ../options/lon_0.rst .. include:: ../options/lat_0.rst 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 ------------------------------------------------------------------------------- |
