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, 20193 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...
231 views1 comment
artlembo
Feb 21, 20192 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...
24 views0 comments
artlembo
Oct 16, 20185 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, 20182 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, 20181 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, 20171 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, 20174 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, 20172 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, 20162 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, 20162 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, 20162 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, 20162 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, 20166 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, 20163 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, 20161 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, 20162 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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