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Calculated Fields in SpatiaLite / SQLite

February 3, 2010, 6:22 am

After downloading data, it’s pretty common that you’ll want to create calculated fields, such as percent totals or change, to use for analysis and mapping. The next step in my QGIS / SpatiaLite...

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Giving GRASS GIS a Try

July 30, 2011, 7:13 pm

I’ve been taking the plunge in learning GRASS GIS this summer, as I’ve been working at home (and thus don’t have access to ArcGIS) on a larger and more long-term project (and thus don’t want to mess...

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Loading Data Into PostGIS – Text Files

February 25, 2014, 10:57 am

I’ve fallen out of the blogosphere for quite awhile. Time to catch up – lately we’ve been experimenting with deploying our own instance of Open Geoportal (see previous post) and square one is getting a...

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Loading Data Into PostGIS – Shapefiles

March 4, 2014, 1:16 pm

This example takes over where the Loading Data Into PostGIS – Text Files left off; we’ll use the same schema usa_general. We’ll load two shapefiles from the Census Bureau’s 2010 Cartographic Boundary...

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NYC Geodatabase Updates: Spatialite Upgrade & ZIPs to ZCTAs

July 30, 2014, 11:07 am

I released the latest version of the NYC geodatabase (nyc_gdb) a few weeks ago. In addition to simply updating the data (for subway stations and ridership, city point features, and ZIP Code Business...

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