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Introduction to GeoDjango
David Wilson
An Outline:
• Who am I?
• What is GeoDjango?
• A Tour of GeoDjango
• Example: Colorado Geology
Who Am I?
Who Am I?
●
Full time Java developer
●
Love Python and the web
●
Degree in Geophysics
●
Some GIS background, actively
working to improve knowledge
●
Travel, weight lifting, cycling,
and skiing
What is GeoDjango?
GeoDjango = spatial toolbox
Spatial?
Not Spatial
Spatial!
A Tour of GeoDjango
Tour: Backends
Tour: Backends
Use this one!
Tour: Models
from django.contrib.gis.db import models
Tour: Models
Tour: Model Fields
●
GeometryField
●
PointField
●
LineStringField
●
PolygonField
●
MultiPointField
●
MultiLineStringField
●
MultiPolygonField
●
GeometryCollectionField
Tour: GeoManager
●
Overrides model manager
●
Enables spatial queries
●
Gotcha: required on models
with no spatial fields that need
to query related models
spatially
Tour: GeoQuerySet
●
Many spatial queries, e.g.
●
contains
●
crosses
●
overlaps
●
intersects
●
Distance and area queries
●
Gotcha: query availability
varies based on backend
Tour: GeoQuerySet
Use this one!
Tour: GEOS API
• Geometry Engine – Open Source
• Loosely coupled to GeoDjango
• Allows for simple creation,
manipulation, and transformation
of geometries
Tour: GDAL API
●
Geospatial Data Abstraction Library
●
Reads spatial data:
●
Shapefiles
●
KML
●
And many, many more!
●
Easy to abstract data sources
Tour: GeoIP
• Ctypes wrapper for MaxMind GeoIP
• Requires appropriate local dataset
• Allows server-side location
• Generally not as accurate as
HTML5 location API
Tour: GeoAdmin
Example:
Colorado Geology
Example: Objectives
• Find Colorado geology data
• Import data
• Query data (find rocks near you!)
• Make a pretty map
Example: Finding Data
Example: Importing Data
Example: Importing Data
Example: View
Example: JavaScript
Example: More JavaScript
Example: Demo
Conclusions
Conclusions
• Spatial toolbox
• Use the parts you need
• Built into the same Django
you already own!
• Will need to understand GIS
basics
• I hope to clean up this demo
app and make a full tutorial
Resources
Docs:
https://docs.djangoproject.com/en/dev/ref/contrib/gis/
Vagrant image:
https://github.com/david-wilson/vagrant-geodjango-base
USGS Colorado Geology Data:
http://mrdata.usgs.gov/geology/state/state.php?state=CO
LeafletJS:
http://leafletjs.com/
Contact Me:
david@davidwilson.me, @dwilson86, http://davidwilson.me

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Introduction to GeoDjango