NOTE: this tool is available in the Planwise Tools Docker image. See scripts/Dockerfile and scripts/tools/README
Download the global friction raster from The Malaria Atlas Project: https://malariaatlas.org/research-project/accessibility_to_cities/
Direct download link: https://malariaatlas.org/geoserver/ows?service=CSW&version=2.0.1&request=DirectDownload&ResourceId=Explorer:2015_friction_surface_v1_Decompressed
The zip file contains a .tif file with the friction layer for most of the planet. Unit is minutes/meter. Unzip it and execute the following script to clip by the country-level regions used by Planwise:
scripts/friction/load-friction-raster PATH_TO_GLOBAL_FRICTION.tifThe script will retrieve the admin-level 0 regions from the database and clip
the raster by the contour of each region, saving them in
$DATA_PATH/friction/regions.
The clips will be used when computing coverage for a site. The clip will be selected by inclusion of the site in the region polygon.