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Intronautics 101

Humanity is overrated

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Fast contour lines using plain PostGIS

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], IDW [3] or kriging-flavoured methods [4]. (image from Wikipedia)

Some little known PostgreSQL/PostGIS tips & tricks

0. What’s this and what’s not

QuadGrid: fast spatial data generalization for the best LoD

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 against the use of personal data as is. Or any piece of data that can lead to the identification of an individual. In EU, the General Data Protection Regulation (GDPR)[1] bill will define all the extents of the potential uses of personal data…

Using PostGIS for isovists calculation

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:

Dymanically find loops in a tracks dataset

To write te article Spies in the sky, the authors needed a multi-step analysis, explained here

Retrieving detailed building heights from Spanish Cadaster

If you want to work with official buildings data in Spain, you can go to Sede Electrónica del Catastro and download the public available vector there. Within the data package, you’ll find a CONSTRU dataset with building information.

Advanced CartoCSS Techniques

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

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