Fixed #17423 -- Fixed three typos in GeoDjango docs. Thanks, DavidEklund

^^^^^^^^^^^^^^

In PostGIS 1.5, the geography type was introduced -- it provides 

provides native support for spatial features represented with geographic

native support for spatial features represented with geographic

coordinates (e.g., WGS84 longitude/latitude). [#fngeography]_

Unlike the plane used by a geometry type, the geography type uses a spherical

representation of its data.  Distance and measurement operations

    >>> from django.contrib.gis.geos import *

    >>> pnt = Point(954158.1, 4215137.1, srid=32140)

Note that ``pnt`` may also constructed with EWKT, an "extended" form of

Note that ``pnt`` may also be constructed with EWKT, an "extended" form of

WKT that includes the SRID::

    >>> pnt = GEOSGeometry('SRID=32140;POINT(954158.1 4215137.1)')

* :class:`~django.contrib.gis.admin.OSMGeoAdmin` requires that the

  :ref:`spherical mercator projection be added <addgoogleprojection>`

  to the to be added to the ``spatial_ref_sys`` table (PostGIS 1.3 and

  below, only).

  to the ``spatial_ref_sys`` table (PostGIS 1.3 and below, only).

* The PROJ.4 datum shifting files must be installed (see the

  :ref:`PROJ.4 installation instructions <proj4>` for more details).