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    artlembo
    • Sep 18, 2019
    • 1 min

    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...
    175 views0 comments
    Easy bivariate map with Postgres
    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...
    155 views0 comments
    Engaging students with multiuser editing, and FOSS4g
    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...
    13 views0 comments
    Big Data Results
    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...
    116 views0 comments
    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...
    230 views0 comments
    Multi-Ring (non-overlapping) Buffers with PostGIS
    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...
    160 views0 comments
    Cartography in ArcGIS and QGIS
    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,...
    12 views0 comments
    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...
    53 views0 comments
    Workshops at the Maryland Geospatial Conference
    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...
    3 views0 comments
    A Typical Class Project at Salisbury University: Evaluating Geocoding Accuracies
    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...
    9 views0 comments
    QGIS GPU Processing Update
    artlembo
    • Jul 23, 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...
    35 views0 comments
    Parallel Processing with QGIS
    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....
    355 views0 comments
    Advanced Editing Capabilities with PostGIS
    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...
    14 views0 comments
    The Web Duel: part 3, Open Source
    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...
    67 views0 comments
    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...
    2 views0 comments
    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...
    1 view0 comments
    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...
    8 views0 comments

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