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    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
    Undergraduate Geospatial Python Projects
    artlembo
    • Dec 18, 2016
    • 4 min

    Undergraduate Geospatial Python Projects

    GIS Programming students presented their programming projects to ESRI. First, I cannot say enough to thank ESRI for taking time out of...
    49 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
    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
    k-Nearest Neighbor with PostGRES
    artlembo
    • Apr 26, 2016
    • 3 min

    k-Nearest Neighbor with PostGRES

    Well, even though you didn’t ask for it, I decided to create a k-nearest neighbor analysis in PostGRES/PostGIS.  This has lots of...
    132 views0 comments
    Trade Area Analysis in Postgres / PostGIS
    artlembo
    • Apr 20, 2016
    • 4 min

    Trade Area Analysis in Postgres / PostGIS

    How I used SQL to generate an accumulated sum of spatial data My friend Tomas does work with business analytics, and wanted to find a way...
    13 views0 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
    When More is Less…. lessons from processing large data files
    artlembo
    • Jul 7, 2015
    • 2 min

    When More is Less…. lessons from processing large data files

    My good friend Stuart Hamilton gave me a fun conundrum to try out. He has a file of province boundaries (400 areas) and lidar derived...
    52 views0 comments
    New Books – How do I do that in PostGIS, How do I do that in Manifold SQL
    artlembo
    • Jun 26, 2015
    • 1 min

    New Books – How do I do that in PostGIS, How do I do that in Manifold SQL

    I have two new books out – How do I do that in PostGIS, and How do I do that in Manifold SQL. From the back cover of How do I do that in...
    24 views0 comments
    A Poor Man’s Parallel Processor for GIS
    artlembo
    • Apr 20, 2015
    • 4 min

    A Poor Man’s Parallel Processor for GIS

    In addition to SQL, I also am interested in processing large volumes of spatial data.  One of the newest rages in “big data” is Hadoop....
    13 views0 comments

    © 2020, Arthur J. Lembo, Jr.

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