TechnicalGIS

#NumPy

2 posts

Tutorial Python

Viewshed analysis in Python: line of sight and a wind farm ZTV with GDAL and numpy

Run a viewshed analysis in Python on a real DEM: compute what one wind turbine can see with gdal.ViewshedGenerate, rebuild the same line-of-sight algorithm in numpy, correct for earth curvature and refraction, build a cumulative zone of theoretical visibility (ZTV) from 26 turbines, draw line-of-sight profiles, and measure how much trees and buildings in a LiDAR DSM shrink a bare-earth viewshed.

Intermediate 16 min read

Tutorial Python Part 1 of 5

From DEM to 3D-printable STL with Python and NumPy

Stream a Copernicus 30 m DEM of the Edale valley, reproject it to British National Grid, scale it to a 150 mm print and write a watertight binary STL using only NumPy, with checks that prove the mesh is printable.

Intermediate 6 min read