Big Data Geo-Analytics with Postgres workshop Evaluation
Technical and Detailed. Great teacher explanation. Really good! Practical advice, in-depth enough to really learn something useful (most...
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artlembo
- Mar 15, 2019
- 2 min
Bivariate Choropleth Maps with Arcpy
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...
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artlembo
- Mar 14, 2019
- 3 min
Easy bivariate map with Postgres
A friend recently asked me about the cool looking bivariate maps produced with ArcOnline, lamenting that the capability seemed lacking...
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artlembo
- Mar 7, 2019
- 2 min
Ready for a new career?
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...
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artlembo
- Feb 21, 2019
- 2 min
Engaging students with multiuser editing, and FOSS4g
A friend is doing some research on estrogen and estrodial in water samples in Delaware. We have about 50 sub-watersheds that show the...
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artlembo
- Dec 11, 2018
- 3 min
PostGIS Multiprocessing Code-Review
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...
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artlembo
- Dec 10, 2018
- 5 min
PostGIS and Multiprocessing
NYC taxi cab pickup locations for October, 2012 OK, let’s cut to the chase: I used Python’s parallel processing capabilities with...
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artlembo
- Oct 28, 2018
- 4 min
Denver workshops – a mixture of sadness and joy.
two successful Keeping Up with GIS Technology workshops out in Denver. This was a week mixed with sadness and joy: sadness in that my...
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artlembo
- Oct 17, 2018
- 2 min
Follow up to my big data test – improving PostGIS performance
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...
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artlembo
- Oct 16, 2018
- 5 min
Big Data Results
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...
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artlembo
- Aug 19, 2018
- 2 min
Maryland GIS Conference: Workshop Results
We had a very successful workshop on GIS at the Maryland Geospatial Conference – well, actually two workshops. I was asked to teach a...
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artlembo
- Aug 10, 2018
- 3 min
Is a Geography Degree worth it?
Recently, we were asked by our new University President, Chuck Wight, how our students are doing in obtaining their first job. You have...
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artlembo
- Jul 7, 2018
- 2 min
Finding “Dangles” with PostGIS
Do you have a set of lines that you need to determine if there are any “dangle” nodes? A dangle is a line segment that overhangs another...
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artlembo
- Jun 26, 2018
- 1 min
Multi-ring (non-overlapping) Buffers with Manifold 9
In my last post, I showed you how to create multi-ring, non-overlapping buffers with spatial SQL in PostGIS. In this post, I want to do...
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artlembo
- Jun 22, 2018
- 1 min
Multi-Ring (non-overlapping) Buffers with PostGIS
I was interested in creating mult-ring buffers but with a twist: I didn’t want the buffers to overlap one another. In other words, if I...
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artlembo
- Jun 19, 2018
- 1 min
GIS Analysis of Overlapping Layers
Sure you can solve it with a few for loops, inserting the results into a new table, but that really is a hassle. Also, I have to do it...
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artlembo
- Apr 11, 2018
- 1 min
5(6) Ways to get data into Postgres/PostGIS
Lots of people ask me how to get data into Postgis. This video is a quick 9 minute demonstration of 3 ways to get data into Postgres...
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artlembo
- Mar 13, 2018
- 2 min
DEM Processing – return of the beast?
I telling the guys at Manifold when something isn’t working the way I think it should. On one hand, I get the satisfaction of sticking...
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artlembo
- Mar 7, 2018
- 2 min
DEM Processing – who’s the beast
(yes, I meant to say Beast). Today I began to experiment with processing some large raster DEMs, and making contours. I used ArcGIS,...
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artlembo
- Mar 1, 2018
- 1 min
USM Award
I was particularly struck by the fact that this award could have easily gone to a poet, philosopher, or physicist, but instead went to...
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