Lin.ear th.inking

The JTS TestBuilder is a great tool for creating geometry, processing it with JTS spatial functions, and visualizing the results.  It has p...

The operation of buffering a geometry is a core geospatial concept.  Standard buffers are computed using a fixed distance around the input ...

Since inception JTS has provided two client tools to aid in using the library.  They are the TestBuilder and the TestRunner .  The Test...

A popular SQL party trick is to generate the Mandelbrot set using Common Table Expressions (CTEs) to implement the required iteration.   T...

My perspicacious colleague Paul Ramsey says "Postgres is having its Linux moment". There is certainly a buzz around PostgreSQL , ...

The second-most important criteria for a spatial algorithm is that it be fast .  (The most important is that it's correct !)  Many spa...

And now for the final chapter in the saga of improving InteriorPoint / PointOnSurface.  For those who missed the first two episodes, the ser...

As a gentle introduction to GEOS development I took on the task of porting the recent improvements to the JTS InteriorPointArea algorithm. ...

A humble workhorse of geospatial processing is the ability to compute a point which is guaranteed to lie in the interior of a polygon.  In t...

I'm happy to announce that I am taking a position with Crunchy Data as a Senior Geospatial Engineer.  I'm working alongside fellow ...

I just landed a JTS pull request for Hilbert and Morton (Z-order) codes and curves. Hilbert Curve of level 3 Morton Curve of level ...

Hilbert Curve of order 4: Hilbert Curve of order 6: Code is in the JEQL script repo . import jeql.std.function.HashFunction; ...

Yes, you don't what the acronym SOSS means, because I just made it up. SOSS stands for Standard Open Simple Spatial format. It's...

Inspiration:  this  post on the JSTS group (with an image - good job on requirements!) JTS implementation: in the lab Code:    Geometry...

In the interests of increasing blog output, I'm going to experiment with using a terser style in posts where the content is mostly self...

Recently I fixed the JTS KD-Tree implementation so that it works as advertised with a distance tolerance to provide point snapping.  This ...

Been a while since I posted, so posting some humour seems like a good start to getting back on track...

OpenLayers provides the useful WMSGetFeatureInfo control.  It's designed to work with the standard WMS GetFeatureInfo request.  As per ...

The intertubes are buzzing about a flight path visualization done by Michael Markieta.  This is based on the same OpenFlights dataset th...