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gdal
GDAL is an open source MIT licensed translator library for raster and vector geospatial data formats.
Currently all our major C++ based number crunching is in the GDAL. We haven't had to make in-house GDExtensions or Modules, yet. But we do also use Godot Voxel. Both are good examples of where you'd want more native speed.
We haven't looked at integrating GRASS yet, as we're more interested in data display, not deep analysis. Just another example of a C/C++ library with front end bindings for Python. Numbers are crunched in C/C++, results returned to Python.
Godot 4 itself is actually fairly good about diving to its C/C++ base for the nasty stuff. Like its Physics. The reimplementation for Jolt physics into Godot 4 is again C/C++ calculation library.
GDAL (Geospatial Data Abstraction Library) is a the geospatial data processing library. It handles a lot of Raster/Vector analysis and alteration. gdal_contour and gdal_rasterize which would be used to create isolines (contour lines) . There's more complex processing and analyses than that. More common is reprojecting multiple layers, and some that being as Vector files, into different coordiatne systems.