XKCD goes geospatial! (Happens to everything eventually...)
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Martin Davis
Popular Posts
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One of the most useful OGC standards is their specification of the Dimensionally-Extended 9 Intersection Model for spatial relationships. ...
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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 ... -
The geo-blogosphere has been buzzing about the global Facebook friends visualization . This was done by Paul Butler using an R script and ...
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After this thread on the JTS list Michael Bedward was inspired to create a polygon triangulation algorithm using the Ear-Clipping approac... -
Recently I've been doing some work with the General Transit Feed Specification (GTFS). This is a simple data model initiated by Google... -
A common spatial need is to find a polygon that accurately represents a set of points. The convex hull of the points often does not provide...
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OpenLayers provides the useful WMSGetFeatureInfo control. It's designed to work with the standard WMS GetFeatureInfo request. As per ...
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Permutations are a fundamental concept in discrete mathematics, and crop up in numerous places in computer science. The set of all possible...
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A recent blog post by Elephant Tamer gives a critical appraisal of the improvements to overlay processing shipped in PostGIS 3.1 with GEOS... -
And now for the final chapter in the saga of improving InteriorPoint / PointOnSurface. For those who missed the first two episodes, the ser...
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