An overview of geoprocessing in its best web incarnation: PostGIS

1. SQL For Everything
Geoprocessing and Cartography With
PostGIS
Bill Morris – Geosprocket LLC

2. Speedy Background
• SQL = Structured Query Language
• Beloved/BeHated by Database Admins
• Runs Behind Nearly Everything
SQL For Everything - Bill Morris - Geosprocket LLC

3. Ever Fired Up a Computer?
You’ve Used SQL.
SQL For Everything - Bill Morris - Geosprocket LLC

4. So What’s PostGIS?
• A spatial extender for the PostgreSQL
database system
• Free as in Speech, Free as in Beer
SQL For Everything - Bill Morris - Geosprocket LLC

5. What’s Post-PostGIS?
• A parody on Twitter. Pay no mind.
SQL For Everything - Bill Morris - Geosprocket LLC

6. What’s CartoDB?
• A PostGIS environment built for the web
• “Open-Source Fusion Tables”
• Build your own server:
https://github.com/CartoDB/cartodb20
• Or get a hosted account:
http://cartodb.com/
SQL For Everything - Bill Morris - Geosprocket LLC

7. SQL For Everything - Bill Morris - Geosprocket LLC

8. SQL For Everything - Bill Morris - Geosprocket LLC

9. Back to SQL.
SQL For Everything - Bill Morris - Geosprocket LLC

10. SQL as we know it
Source: Chicago Crime Commission & Openstreetmap Contributors
SQL For Everything - Bill Morris - Geosprocket LLC

11. SELECT * FROM territory_all WHERE
“NAME” LIKE ‘Latin%’
Source: Chicago Crime Commission & Openstreetmap Contributors
SQL For Everything - Bill Morris - Geosprocket LLC

12. SELECT * FROM territory_all WHERE
name LIKE ‘Latin%’
SQL For Everything - Bill Morris - Geosprocket LLC

13. Geoprocessing as we know it
SQL For Everything - Bill Morris - Geosprocket LLC

14. Geoprocessing in PostGIS
SELECT ST_Whatever( geoprocess! )
SQL For Everything - Bill Morris - Geosprocket LLC

15. Geoprocessing in PostGIS
SQL For Everything - Bill Morris - Geosprocket LLC

16. Buffer 500m
SQL For Everything - Bill Morris - Geosprocket LLC

17. Buffer 500m from the points that
fall on Ashland Ave
SQL For Everything - Bill Morris - Geosprocket LLC

18. Append two layers of different
geometry types
SQL For Everything - Bill Morris - Geosprocket LLC

19. Geoprocessing Optimized
…png?sql=…
SQL For Everything - Bill Morris - Geosprocket LLC

20. ?
SQL For Everything - Bill Morris - Geosprocket LLC

21. This is Familiar
google.com?q=GIS
SQL For Everything - Bill Morris - Geosprocket LLC

22. …png?sql=…
SQL For Everything - Bill Morris - Geosprocket LLC

23. http://2.tiles.cartocdn.com/geosprocket/tiles/vtparcels_burlington2002b/15/9714/11850.png
SQL For Everything - Bill Morris - Geosprocket LLC

24. http://2.tiles.cartocdn.com/geosprocket/tiles/vtparcels_burlington2002b/15/9714/11850.png?sql
=SELECT * FROM vtparcels_burlington2002b WHERE area>8000
SQL For Everything - Bill Morris - Geosprocket LLC

25. http://2.tiles.cartocdn.com/geosprocket/tiles/vtparcels_burlington2002b/15/9714/11850.png?sql
=SELECT 20 as distance, st_buffer(the_geom_webmercator,50) as the_geom_webmercator FROM
vtparcels_burlington2002b WHERE area>80000
SQL For Everything - Bill Morris - Geosprocket LLC

26. Going off the Rails a Bit . . .
https://gist.github.com/wboykinm/5533575
SQL For Everything - Bill Morris - Geosprocket LLC

27. SQL For Everything - Bill Morris - Geosprocket LLC

28. A Query Turns This . . .
SQL For Everything - Bill Morris - Geosprocket LLC

29. Into This.
SQL For Everything - Bill Morris - Geosprocket LLC

30. I’m barely scratching the surface of SQL here.
https://gist.github.com/wboykinm/5533575
SQL For Everything - Bill Morris - Geosprocket LLC

31. Why Care?
Because the web wants to see
your data
SQL For Everything - Bill Morris - Geosprocket LLC

32. SQL For Everything - Bill Morris - Geosprocket LLC

33. SQL For Everything - Bill Morris - Geosprocket LLC

34. SQL For Everything - Bill Morris - Geosprocket LLC

35. SQL For Everything - Bill Morris - Geosprocket LLC

36. PostGIS
SQL For Everything - Bill Morris - Geosprocket LLC

37. Thanks! Accepting all questions:
wboykinm@geosprocket.com
@vtcraghead
SQL For Everything - Bill Morris - Geosprocket LLC