Geo django
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GeoDjango allows you to work with geographic data seamlessly in Django. It adds spatial lookups to the Django ORM so you can query geographic objects by distance and location. Setting up GeoDjango involves installing PostGIS and GEOS libraries, creating a spatial database, configuring Django settings to use the PostGIS database engine, and registering geographic models with GeoManager. The admin site can also be customized to display maps using templates that include Google Maps JavaScript API.
![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)](https://image.slidesharecdn.com/geodjango-130108215016-phpapp01/85/Geo-django-9-320.jpg)
Geo django
- 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 %}