[2021 Day 9] Cave Floor Relief Map

This page summarizes the projects mentioned and recommended in the original post on reddit.com/r/adventofcode

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  • TopOSM

    Render OpenStreetMap based Topo maps

    Then I saved that 18x image in a Digital Elevation Model format and used gdaldem to generate hillshaded and hypsorelief images from the DEM. Finally, I used ImageMagick to blend the two together using parameters originally derived from the hypsorelief generation in TopOSM.

  • The code is at the bottom of my day 9 source file, in Common Lisp. (The AdvMAME3x code was something I originally wrote for my 2020 day 20 visualization.)

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  • adventofcode

    My python solutions to that funny project (by kirienko)

    This amazing visualization reveals a kind of a bug in the basin generation algorithm: _any_ point which is not '9' belongs to some basin. That observation was a hint for this very short solution: we could simply exclude nines and count the connected components of the rest (my [source code](https://github.com/kirienko/adventofcode/blob/master/2021/day_09.py)_without the answer_: python + `networkx`).

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