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...

A friend recently asked me about the cool looking bivariate maps produced with ArcOnline, lamenting that the capability seemed lacking...

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...

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...

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...

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...

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...

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...

The TuGIS training workshop on March 20, 2017 is completed – you can see the workshop evaluations below: The workshop evaluations are in...

GIS Programming students presented their programming projects to ESRI. First, I cannot say enough to thank ESRI for taking time out of...

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...

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...

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...

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...

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...

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...

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...

In previous posts, I showed how to create ARC/INFO functions in SQL using Manifold 8.  While I love SQL, it is somewhat frustrating to...

In our book we illustrated the use of quadrat analysis for determining whether points were random, clustered, or distributed.  Figure...

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...