1. GeoDjango

2. What is GeoDjango
• included contrib module for Django that turns it into a world-class geographic Web framework.
• GeoDjango makes working Geo Data in Django
seamless.

3. Wait.. How seamless is seamless?
• Geospatially enabled admin site

4. Wait.. How seamless is seamless?
• GeoDjango adds spatial lookups to the Django ORM
• Query = Marker.objects.filter(point__distance_lte=(pnt, D(km=5)))
• Gives you all those markers less than or equal the given
distance

5. Setting up
• Geospatial Libraries
– PostGIS (requires PostgreSQL 9.1+)
– GEOS
– PROJ.4

6. Creating spatial database
• For PostGIS 2 and PostgreSQL 9.1 +
– $ createdb <dbname>
– $ psql <dbname>
– > CREATE EXTENSION postgis
• Alternatively, you could create postgis
template and createdb with it
– $ createdb -T postgis_template <dbname>

7. Configuration
• settings.py
• Change database engine
'ENGINE': 'django.contrib.gis.db.backends.postgis',
Add to INSTALLED_APPS
‘django.contrib.gis’,

8. Configuration
• From django.contrib.gis.db import models
• class Marker(models.Model):
name = models.CharField(‘name’)
location = models.PointField(srid=4326)
objects = models.GeoManager()

9. Admin.py setup
from django.contrib.gis import admin
from django.contrib.gis.geos import Point
from models import Marker
class GoogleAdmin(admin.OSMGeoAdmin):
sgPoint = Point(103.8, 1.3667, srid=4326)
sgPoint.transform(900913)
default_lon, default_lat = sgPoint.coords
default_zoom = 11
map_template = 'gis/admin/google.html'
extra_js =
['https://maps.google.com/maps?file=api&v=3&sensor=false&callback=initialize']
admin.site.register(MapPoint, GoogleAdmin)

10. Admin Map template
Google.html
{% extends "gis/admin/openlayers.html" %}
{% block extrastyle %}{{ block.super }}
<style type="text/css">v:* {behavior:url(#default#VML);}</style>
{% endblock %}
{% block openlayers %}{% include "gis/admin/google.js" %}{% endblock %}
Google.js
{% extends "gis/admin/openlayers.js" %}
{% block base_layer %}new OpenLayers.Layer.Google("Google Base Layer", {
'type': G_NORMAL_MAP,
'sphericalMercator' : true});
{% endblock %}