[1.8.x] Fixed #25641 -- Removed section about adding Google projection to spatial_ref_sys table

This is the so that ``gis`` templates can be located -- if not done, then

features such as the geographic admin or KML sitemaps will not function properly.

.. _addgoogleprojection:

Add Google projection to ``spatial_ref_sys`` table

--------------------------------------------------

.. note::

    If you're running GDAL 1.7 or above (most users), you can skip this step.

In order to conduct database transformations to the so-called "Google"

projection (a spherical mercator projection used by Google Maps),

an entry must be added to your spatial database's ``spatial_ref_sys`` table.

Invoke the Django shell from your project and execute the

``add_srs_entry`` function:

.. code-block:: pycon

    $ python manage.py shell

    >>> from django.contrib.gis.utils import add_srs_entry

    >>> add_srs_entry(900913)

This adds an entry for the 900913 SRID to the ``spatial_ref_sys`` (or equivalent)

table, making it possible for the spatial database to transform coordinates in

this projection.  You only need to execute this command *once* per spatial database.

Troubleshooting

===============

First, there are some important requirements:

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

  :doc:`GDAL <gdal>` is installed. If you are running GDAL 1.6 (uncommon)

  you will also need to add the :ref:`spherical mercator projection

  <addgoogleprojection>`  to the ``spatial_ref_sys`` table.

  :doc:`GDAL <gdal>` is installed.

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

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