Abel Vázquez

Advanced CartoCSS Techniques

less than 1 minute read

Some obscure CartoCSS techniques by STAMEN’ Director of Technology, Seth Fitzsimmons. Two years old slides, but still quite useful.

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Fast contour lines using plain PostGIS

6 minute read

There’s a bunch of different ways to generate contour lines [1] from scatter data, each of them based on different interpolation algorithms. Like KNN [2], ID...

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QuadGrid: fast spatial data generalization for the best LoD

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Last years have seen the rise of data sources with IoT, AoT, mobile devices, beacons, etc. The study of this data can be quite profitable, but there are laws...

Using PostGIS for isovists calculation

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First of all, what is an isovist? It’s simply the same as a viewshed… and what the heck is a viewshed? Let’s go to the Wikipedia:

Abel Vázquez

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