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...

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...

When you were in Statistics 101, and the Professor said ok, we are now going to learn about the Central Limit Theorem, did you tune out?...

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...

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...

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...

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...

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...

Following up on my previous post with ArcGIS and the Near Table, I created an SQL query in Manifold 8 to do both the near distances and...

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...

I was recently asked by danb to illustrate the ARC/INFO function symmetrical difference. We basically want to find those areas in layer A...

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...

The ARC/INFO IDENTITY operation seen here is sometimes confusing because it takes ALL of the Input feature, and the part of the IDENTITY...

I wrote a paper in 2006 about using SQL for the Modifiable Area Unit Problem (MAUP).  The example was an agricultural experiment field,...

Lets take another break from my textbook, and focus on a classic GIS operation.  If you are like me, you learned GIS with ARC/INFO.  I...

In case you are getting tired of reading examples from my book (did I mention that I have a textbook you can buy from Amazon?), I thought...

This post is part of a series entitled Spatial is not Special, where I will illustrate how spatial constructs in SQL provide us with a...

This post is part of a series entitled Spatial is not Special, where I will illustrate how spatial constructs in SQL provide us with a...