#588: isochrones, heights, cities
, last check: Mon, 20 Oct 2025. Post history
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    Measure pedestrian access using raster analysis in JavaScript  
    
    
 https://github.com/atogle/walkshed.js/
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    Extracting building heights with LIDAR to produce 3D models   
    
    
 https://blog.nadnerb.co.uk/?p=209
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    A 2016 updated table to classify the main world cities  
    
    
 https://geoconfluences.ens-lyon.fr/actualites/veille/breves/classement-global-cities-2016
Raf