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In my previous post, I showed how to prepare the data for a bivariate choropleth map using PostGIS and QGIS. I also indicated that there is ..read more
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A friend recently asked me about the cool looking bivariate maps produced with ArcOnline, lamenting that the capability seemed lacking in ..read more
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gisadvising by Art Lembo - 5M ago

I just got off the phone with a very large developer. I want to call him a GIS developer, but really that’s not was he does. Rather, he ..read more
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A friend is doing some research on estrogen and estrodial in water samples in Delaware. We have about 50 sub-watersheds that show the ..read more
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As promised, let’s walk through the code I wrote to create the multiprocessing of my Postgres/PostGIS task.  You may recall that I said ..read more
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OK, let’s cut to the chase: I used Python’s parallel processing capabilities with Postgres to perform a spatial overlay on ..read more
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We just completed another two successful Keeping Up with GIS Technology workshops out in Denver.  This was a week mixed with sadness and ..read more
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Just a quick follow-up to my big data test.  If you remember, I was able to determine the number of taxi pickups and the sum of the fares ..read more
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gisadvising by Art Lembo - 10M ago

I wanted to revisit the taxi data example that I previously blogged about.  I had a 6GB file of 16 million taxi pickup locations and 260 ..read more
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