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Introduction to GeoDjano. Django Weekend Cardiff
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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.
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Sunday, 9 February 2014
Here be dragonsSunday, 9 February 2014
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• 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
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Defining GeoDjango Models
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Creating Geographically Related Instances
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One advantage of modelling geographic relationships this way:
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What’s in the database?
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GEOS Instances
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Using Spatial RelationshipsPossible places to check in
Nearest restaurant
Within user-defined area
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The closest bar I’ve been to before
The most popular bar in London
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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
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Time to output for the web
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The Admin Interface
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https://www.sharegeo.ac.uk/
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+ =
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+ =
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Postcodes
https://github.com/gareth-lloyd/postcode_latlng
Sunday, 9 February 2014
Thank you!
London Django Coding Session - Biweekly
Hosted by:
Conversocial - always hiring Django people
@godawfulglloyd@gmail.com
Sunday, 9 February 2014
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