Retrieving detailed building heights from Spanish Cadaster

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)

0. What’s this and what’s not

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...

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:

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