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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...
    174 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...
    220 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...
    145 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...
    29 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...
    9 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
    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...
    31 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...
    119 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...
    9 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...
    23 views0 comments
    Spatial is Not Special – Quadrat Analysis
    artlembo
    • Jun 9, 2014
    • 2 min

    Spatial is Not Special – Quadrat Analysis

    In our book we illustrated the use of quadrat analysis for determining whether points were random, clustered, or distributed.  Figure...
    28 views0 comments
    Spatial is Not Special – Nearest Neighbor Index
    artlembo
    • May 30, 2014
    • 2 min

    Spatial is Not Special – Nearest Neighbor Index

    It is nice to get back to the book, and start talking about Statistical Problem Solving in Geography again.  Today we are going to look...
    11 views0 comments
    ARC/INFO Functions in SQL – Line Density
    artlembo
    • May 28, 2014
    • 2 min

    ARC/INFO Functions in SQL – Line Density

    Dale posted a request to see Line Density recreated in SQL.  Please take a look at the ESRI help topic for line density. I will warn you,...
    4 views0 comments
    artlembo
    • May 26, 2014
    • 1 min

    ARC/INFO Functions – Symmetrical Difference

    I was recently asked by danb to illustrate the ARC/INFO function symmetrical difference. We basically want to find those areas in layer A...
    7 views0 comments
    artlembo
    • May 23, 2014
    • 2 min

    ARC/INFO Functions – UNION

    We are going to conclude our overlay posts with the ARC/INFO UNION command.  This should be a lot easier than it actually is.  I think...
    7 views0 comments
    ARC/INFO Functions in SQL – IDENTITY
    artlembo
    • May 21, 2014
    • 2 min

    ARC/INFO Functions in SQL – IDENTITY

    The ARC/INFO IDENTITY operation seen here is sometimes confusing because it takes ALL of the Input feature, and the part of the IDENTITY...
    1 view0 comments
    Spatial is Not Special – Spatial Interaction completion
    artlembo
    • May 14, 2014
    • 1 min

    Spatial is Not Special – Spatial Interaction completion

    We’ve spent some time looking at how to create spatial interaction models using PIVOT tables and spatial constructs in SQL.  The one last...
    1 view0 comments
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    © 2020, Arthur J. Lembo, Jr.

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