Lin.ear th.inking

JTS allows specifying styling parameters to control the appearance of generated buffer polygons. End Cap styles have been available for a wh...

Here's a nifty mashup using Google Maps. It computes a skyline terrain panorama from a given location. The computed skyline isn't...

So GM now has terrain - yay! But they seem to have short-changed half the continent. Check this screenshot from the border just south of C...

Permutations are a fundamental concept in discrete mathematics, and crop up in numerous places in computer science. The set of all possible...

If you're a language geek, this post by David Rupp is hilarious!

A common requirement in spatial processing is to union a set of polygons together. Depending on the use case, the polygons may either be a ...

Occasionally people ask about the algorithms used in JTS's overlay operations. I don't have a good answer for this, since I basical...

The Bhagavad Gita of Multidimensional Access Methods... The Koran of Quadtrees... One of the people I met at ACM GIS 2007 was the conference...

I just got back from ACM GIS 2007 , over in Seattle. This is the first time I've attended this conference - or even known about it! It...

Ever since I upgraded to Google Earth 4, I've had the extremely annoying problem that tilting to an oblique view produced a completely b...

The great thing about living on an island in the Pacific Ocean is that you're surrounded by... well, ocean. And the great thing about ...

Everyone knows that the equation of a circle is the beautifully simple: x 2 + y 2 = C An obvious generalization of this is to allow higher...

The Bibliotheque Nationale de France has an online exhibition of a vision of the world in the year 2000 - published in the year 1910. It...

.. courtesy of Adrian Custer on the OpenJUMP mailing list : > > just one question .. what is this bursa wolf parameter option? >...

Office 2.0 is an index of Web-hosted applications. The entire list is pretty overwhelming, but more immediately interesting is the list o...

Here's an important conference which unfortunately I missed last year. But no matter - the content is timeless, so no doubt it will be...

There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the oth...

Here at Refractions we're starting to think about how we can provide better support in PostGIS for geodetic data . Geodetic data is da...

Ted Nedward has another great post providing lessons about technical, political and historical issues all at the same time. Let's just ...

Oracle provides a very powerful SQL extension to evaluate hierarchical queries (transitive closures) on tables. This recently saved my baco...