Virtual layers with QGIS – wait a second, this is starting to look like Manifold…
If you are like me, you love writing spatial SQL. But what can you do if you have a geodatabase, some shapefiles, or any other data...
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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
- 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
- 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
- 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 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
- May 17, 2017
- 1 min
Cartography in ArcGIS and QGIS
She also has an innate ability to work with GIS, and pick up new things: one day she has never programmed in Python, and the next day,...
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artlembo
- May 3, 2017
- 4 min
The Web Duel – Last Thoughts
The Web GIS Duel: Final Thoughts This is a continuation of Mark Balwanz’s blog posts on his creation of web mapping sites using both ESRI...
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artlembo
- Jan 27, 2017
- 2 min
Workshops at the Maryland Geospatial Conference
#TUgis2017) is on March 20/21, 2017. I first attended TUgis in 1990, and it is always a great conference. It is not too large, so it is...
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artlembo
- Oct 25, 2016
- 2 min
A Typical Class Project at Salisbury University: Evaluating Geocoding Accuracies
I’ve always been proud of our Salisbury University GIS students, and love to push them as far as their little minds can handle it. You...
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artlembo
- Jul 22, 2016
- 2 min
QGIS GPU Processing Update
Today my students got to present some of their work at the Maryland Geographic Information Committee Quarterly meeting. On Monday we...
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artlembo
- Jun 29, 2016
- 2 min
Parallel Processing with QGIS
Once again, I am continuing my role as a mentor in a National Science Foundation (NSF) Research Experience for Undergraduate program....
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artlembo
- May 26, 2016
- 2 min
Advanced Editing Capabilities with PostGIS
CLICK TO VIEW Jeff Scarmazzi presenting on h0w to create editing rules and triggers using Postgres and PostGIS Today I want to introduce...
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artlembo
- May 22, 2016
- 6 min
The Web Duel: part 3, Open Source
The Open Source Implementation This is a continuation of Mark Balwanz’s blog posts on his creation of web mapping sites using both ESRI...
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artlembo
- May 18, 2016
- 3 min
Open Source GIS Course at UMD – the Syllabus
UMD provided me with enrollment numbers, and we are getting a pretty full class. However, a few people on the “outside” have asked for a...
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artlembo
- May 3, 2016
- 1 min
Upcoming course: GDAL
I am putting up a new course on udemy.com about learning GDAL – and, it is going to be FREE. I’ve been so happy with the uptake and...
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artlembo
- Apr 19, 2016
- 2 min
SQL and ogr to create 4D lines
A friend recently asked me to help him generate polyline shapefiles with Z and M values that he could deliver to a customer. The problem...
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