Sql for Everything: GIS on the Web

SQL For Everything

Geoprocessing and Cartography With PostGIS

Bill Morris – Geosprocket LLC

Speedy Background

• SQL = Structured Query Language

• Beloved/BeHated by Database Admins

• Runs Behind Nearly Everything

SQL For Everything - Bill Morris - Geosprocket LLC

Ever Fired Up a Computer?

You’ve Used SQL.


So What’s PostGIS?

• A spatial extender for the PostgreSQL database system

• Free as in Speech, Free as in Beer


What’s Post-PostGIS?

• A parody on Twitter. Pay no mind.


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/


https://github.com/CartoDB/cartodb20

https://github.com/CartoDB/cartodb20

http://cartodb.com/

Back to SQL.


SQL as we know it


Source: Chicago Crime Commission & Openstreetmap Contributors

SELECT * FROM territory_all WHERE

“NAME” LIKE ‘Latin%’


Source: Chicago Crime Commission & Openstreetmap Contributors

SELECT * FROM territory_all WHERE

name LIKE ‘Latin%’


Geoprocessing as we know it


Geoprocessing in PostGIS


SELECT ST_Whatever( geoprocess! )

Geoprocessing in PostGIS


Buffer 500m


Buffer 500m from the points that fall on Ashland Ave


Append two layers of different geometry types


Geoprocessing Optimized


…png?sql=…

?


This is Familiar


google.com?q=GIS


…png?sql=…

http://2.tiles.cartocdn.com/geosprocket/tiles/vtparcels_burlington2002b/15/9714/11850.png


http://2.tiles.cartocdn.com/geosprocket/tiles/vtparcels_burlington2002b/15/9714/11850.png

http://2.tiles.cartocdn.com/geosprocket/tiles/vtparcels_burlington2002b/15/9714/11850.png?sql=SELECT * FROM vtparcels_burlington2002b WHERE area>8000




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


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



Going off the Rails a Bit . . .


https://gist.github.com/wboykinm/5533575


A Query Turns This . . .


Into This.


I’m barely scratching the surface of SQL here.




Because the web wants to see your data


Why Care?


http://cartodb.github.io/cartodb.js/examples/tutorials/tutorial-query_by_distance.html


http://wboykinm.github.io/modular-geoportal/


http://cartodb.github.io/torque/


PostGIS

Thanks! Accepting all questions:


[email protected]

@vtcraghead

mailto:[email protected]

Sql for Everything: GIS on the Web

Technology

Transcript of Sql for Everything: GIS on the Web