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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
    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
    GIS Analysis of Overlapping Layers
    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...
    37 views0 comments
    Big Data GeoAnalytics – adding data
    artlembo
    • Nov 30, 2017
    • 1 min

    Big Data GeoAnalytics – adding data

    Continuing my series on big data geoanalytics, I wanted to show how to bring in large data sets so that we can start working with them....
    9 views0 comments
    Big Data GeoAnalytics – Turning Points to Lines
    artlembo
    • Nov 21, 2017
    • 1 min

    Big Data GeoAnalytics – Turning Points to Lines

    In my last video, I gave a short of mile-high view of how SQL can be used for big data geoanalytics.  I want to dive a little deeper, and...
    3 views0 comments
    Big data geo-analytics with SQL
    artlembo
    • Nov 20, 2017
    • 1 min

    Big data geo-analytics with SQL

    I’m getting ready to create a course in big data analytics with GIS.  I have lots of ideas as to what to do, but one thing I know is that...
    11 views0 comments
    artlembo
    • Mar 26, 2017
    • 2 min

    Maryland State GIS Conference (TuGIS)

    The TuGIS training workshop on March 20, 2017 is completed – you can see the workshop evaluations below: The workshop evaluations are in...
    1 view0 comments
    Radian can read ESRI geodatabases
    artlembo
    • Mar 1, 2017
    • 1 min

    Radian can read ESRI geodatabases

    previous video, I showed how Radian studio can read data directly from PostgreSQL, SQLite, and also easily exchange data between them.  ...
    6 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
    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
    k-nearest neighbor with SQL in Radian Studio
    artlembo
    • Apr 26, 2016
    • 2 min

    k-nearest neighbor with SQL in Radian Studio

    I wanted to give you another look at some features that Radian Studio will offer. I’ve shown how we can use SQL to replicate the ARC/INFO...
    9 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
    Doing a GROUP BY in ArcGIS
    artlembo
    • Jul 13, 2015
    • 1 min

    Doing a GROUP BY in ArcGIS

    As most of you know, I am a big fan of spatial SQL.  It is my go-to tool whenever working with GIS.  But, I have seen too many people...
    9 views0 comments
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    © 2020, Arthur J. Lembo, Jr.

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