Fixed #25141 -- Diminished GDAL dependence during geojson serialization

Only require GDAL if contained geometries need coordinate transformations.
Thanks drepo for the report and Tim Graham for the review.

1 files changed, 11 insertions, 3 deletions

diff --git a/docs/ref/contrib/gis/serializers.txt b/docs/ref/contrib/gis/serializers.txt
index 54b6c5727c..59266940e3 100644
--- a/docs/ref/contrib/gis/serializers.txt
+++ b/docs/ref/contrib/gis/serializers.txt
@@ -7,9 +7,17 @@ GeoJSON Serializer
 .. module:: django.contrib.gis.serializers.geojson
    :synopsis: Serialization of GeoDjango models in the GeoJSON format.
 
-GeoDjango provides a specific serializer for the `GeoJSON`__ format. The GDAL
-library is required for this serializer. See :doc:`/topics/serialization` for
-more information on serialization.
+GeoDjango provides a specific serializer for the `GeoJSON`__ format. See
+:doc:`/topics/serialization` for more information on serialization.
+
+The GDAL library is required if any of the serialized geometries need
+coordinate transformations (that is if the geometry's spatial reference system
+differs from the ``srid`` serializer option).
+
+.. versionchanged:: 1.9
+
+    The GeoJSON serializer no longer needs GDAL if all geometries are in the
+    same coordinate system as the ``srid`` serializer option.
 
 __ http://geojson.org/