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| -rw-r--r-- | docs/source/operations/projections/utm.rst | 73 |
1 files changed, 70 insertions, 3 deletions
diff --git a/docs/source/operations/projections/utm.rst b/docs/source/operations/projections/utm.rst index 7fb66cb8..ac65aa1a 100644 --- a/docs/source/operations/projections/utm.rst +++ b/docs/source/operations/projections/utm.rst @@ -4,7 +4,74 @@ Universal Transverse Mercator (UTM) ******************************************************************************** -.. image:: ./images/utm.png - :scale: 50% - :alt: Universal Transverse Mercator (UTM) +The Universal Transverse Mercator is a system of map projections divided into +sixty zones across the globe, with each zone corresponding to 6 degrees of +longigude. ++---------------------+----------------------------------------------------------+ +| **Classification** | Transverse cylindrical, conformal | ++---------------------+----------------------------------------------------------+ +| **Available forms** | Forward and inverse, Spherical and Elliptical | ++---------------------+----------------------------------------------------------+ +| **Defined area** | Within the used zone, but transformations of coordinates | +| | in adjacent zones can be expected to be accurate as well | ++---------------------+----------------------------------------------------------+ +| **Alias** | utm | ++---------------------+----------------------------------------------------------+ +| **Domain** | 2D | ++---------------------+----------------------------------------------------------+ +| **Input type** | Geodetic coordinates | ++---------------------+----------------------------------------------------------+ +| **Output type** | Projected coordinates | ++---------------------+----------------------------------------------------------+ + +.. figure:: ../../../images/utm_zones.png + :alt: Universal Transverse Mercator (UTM) zones + :figwidth: 100% + :align: center + + UTM zones. + +UTM projections are really the :ref:`Transverse Mercator<tmerc>` +to which specific parameters, such as central meridians, have been applied. +The Earth is divided into 60 zones each generally 6° wide in longitude. +Bounding meridians are evenly divisible by 6°, and zones are +numbered from 1 to 60 proceeding east from the 180th meridian from Greenwich +with minor exceptions [Snyder1987]_. + +Usage +##### + +Convert geodetic coordinate to UTM Zone 32 on the northern hemisphere:: + + $ echo 12 56 | proj +proj=utm +zone=32 + 687071.44 6210141.33 + +Convert geodetic coordinate to UTM Zone 59 on the souther hemisphere:: + + $ echo 174 -44 | proj +proj=utm +zone=59 +south + 740526.32 5123750.87 + +Parameters +################################################################################ + +Required +------------------------------------------------------------------------------- + +.. option:: +zone=<value> + + Select which UTM zone to use. Can be a value between 1-60. + +.. option:: +south + + Add this flag when using the UTM on the southern hemisphere. + +Optional +------------------------------------------------------------------------------- + +.. include:: ../options/ellps.rst + +Further reading +############### + +#. `Wikipedia <https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system>`_ |