GeoDjango: Putting Django on the Map

GeoDjango: Putting Django on the Map

Sunday, 9 February 2014

Tobler’s First Law of Geography:

"Everything is related to everything else, but near things are more related than distant things."

Tobler, W. (1970) "A computer movie simulating urban growth in the Detroit region". Economic Geography, 46(2): 234-240.



Here be dragonsSunday, 9 February 2014



• Install PostGIS (postgis.net/install/)

• You can use other dbs, but...

• Install libraries (docs.djangoproject.com/...)

• Add django.contrib.gis to INSTALLED_APPS and you’re hot to trot


http://postgis.net/install/

http://postgis.net/install/

Defining GeoDjango Models


Creating Geographically Related Instances


One advantage of modelling geographic relationships this way:


What’s in the database?


GEOS Instances


Using Spatial RelationshipsPossible places to check in

Nearest restaurant

Within user-defined area


The closest bar I’ve been to before

The most popular bar in London


Lookup Type PostGIS Oracle SpatiaLite MySQLbbcontains X X Xbboverlaps X X Xcontained X X Xcontains X X X Xcontains_properly Xcoveredby X X covers X X crosses X Xdisjoint X X X Xdistance_gt X X Xdistance_gte X X Xdistance_lt X X Xdistance_lte X X Xdwithin X X equals X X X Xexact X X X Xintersects X X X Xoverlaps X X X Xrelate X X Xsame_as X X X Xtouches X X X Xwithin X X X Xleft Xright Xoverlaps_left Xoverlaps_right Xoverlaps_above Xoverlaps_below Xstrictly_above Xstrictly_below X


Time to output for the web


The Admin Interface


https://www.sharegeo.ac.uk/




+ =


+ =


Postcodes

https://github.com/gareth-lloyd/postcode_latlng




Thank you!

London Django Coding Session - Biweekly

Hosted by:

Conversocial - always hiring Django people

@[email protected]


mailto:[email protected]

mailto:[email protected]

Technology

GeoDjango: Putting Django on the Map