For OSM data I was impressed by Caribou.
I posted my advice on writing shapefiles last week.
Reading shapefiles is much easier overall. Just watch out for Rhino’s curious rules about invalid polylines:
https://developer.rhino3d.com/api/rhinocommon/rhino.geometry.polyline/isvalid
Do you need to read in “raster image” or “geotiff DEM” formats?
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