Add UTM docs

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>`_