Talk I gave at the Dutch python usergroup meeting of 2011-02-16.

1. Geographic websites for
water management
Reinout van Rees

2. Geographic websites for
water management
Reinout van Rees

3. Geografic info website

4. “Apps”: data sources

5. Data browsing

6. Workspace + map

7. Graph popup

8. Example movie

9. Technologies
• Python
• Django
• Jquery
• Mapnik
• Openlayers
• Matplotlib
• Blueprint css
• Gdal
• Pyproj

10. Mapnik
• Openstreetmap’s
rendering engine
• Points, lines, grids
• WMS standard
• PNG output

11. Gdal
• Used behind the
scenes as library,
mostly
• We use it directly for
grids

12. Matplotlib
• Graph library
• Can do everything
• Others easier, but
with limitations

13. Pyproj
• Rijksdriehoek: 136389, 456823
• Degrees: 52.092138N, 5.113707E
• Google mercator: 550000, 6850000

14. Client side
• Jquery
• Openlayers
• Blueprint css framework

15. Layered software
structure
• Core: splitting everything up
• Lizard-ui: html page structure
• Lizard-map: maps + plugin mechanism
• Lizard-xyz plugins: data sources

16. Lizard-ui: html page
structure

17. Lizard-map: map core
• Workspace
• Map visualisation
• Basic graph handling
• Basic search handling
• Basic popup
• Plugin mechanism (“adapter”)

18. Lizard-map plugins
data-adapter=”fews” .html() => popup contents
data-id=”423”
.graph() => png
.search() => closest location id .layers() => mapnik layer

19. Organisation
• Collective code ownership
• Pep8/pyflakes
• Talking, “borrowing brains”
• Tests, jenkins (hudson)
• Documentation (generated)

20. http://doc.lizardsystem.nl/
http://reinout.vanrees.org/weblog/
We want you! Business is booming!
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