Fixed #15533 -- Now use 3857 as spherical mercator projection instead…

… of deprecated 900913 on platforms that support it. Thanks to cnorthwood for bug report and Christopher Schmidt for OpenLayers JavaScript workaround.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15845 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/admin/options.py

@@ -113,11 +113,18 @@ class OLMap(self.widget):
 
 from django.contrib.gis import gdal
 if gdal.HAS_GDAL:
+    # Use the official spherical mercator projection SRID on versions
+    # of GDAL that support it; otherwise, fallback to 900913.
+    if gdal.GDAL_VERSION >= (1, 7):
+        spherical_mercator_srid = 3857
+    else:
+        spherical_mercator_srid = 900913
+
     class OSMGeoAdmin(GeoModelAdmin):
         map_template = 'gis/admin/osm.html'
         extra_js = ['http://www.openstreetmap.org/openlayers/OpenStreetMap.js']
         num_zoom = 20
-        map_srid = 900913
+        map_srid = spherical_mercator_srid
         max_extent = '-20037508,-20037508,20037508,20037508'
         max_resolution = '156543.0339'
         point_zoom = num_zoom - 6

django/contrib/gis/templates/gis/admin/openlayers.js

@@ -1,4 +1,5 @@
 {# Author: Justin Bronn, Travis Pinney & Dane Springmeyer #}
+OpenLayers.Projection.addTransform("EPSG:4326", "EPSG:3857", OpenLayers.Layer.SphericalMercator.projectForward);
 {% block vars %}var {{ module }} = {};
 {{ module }}.map = null; {{ module }}.controls = null; {{ module }}.panel = null; {{ module }}.re = new RegExp("^SRID=\d+;(.+)", "i"); {{ module }}.layers = {};
 {{ module }}.modifiable = {{ modifiable|yesno:"true,false" }};