[postgis-users] Comparing two Building Footprint Tables

Clifford Snow clifford at snowandsnow.us
Fri Aug 22 15:49:27 PDT 2014

The city of Seattle published a new shapefile with the latest building
footprints. The previous file was from 2009. I'd like to find which
outlines have changed. While I can see the differences using QGIS, what I
need is a list of changed or new building footprints. I'm struggling where
to start. There are about 300K footprints. The city did not retain any
unique ids from the previous file to the new.

Any suggestions would be appreciated.


OpenStreetMap: Maps with a human touch
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