Topo to 3D

How to make a printable 3D model from topo maps - notes.

Get the topo map, in GeoTiff format. Possible sources are:

• http://opentopo.sdsc.edu
• https://viewer.nationalmap.gov/basic/

Convert the GeoTiff file to USGS ASCII DEM format. Possible tools are:

• On Linux: GDAL translate option

sudo apt install gdal-bin
gdal_translate -of AAIGrid /yoursourcepath/output_alos.tif /youroutputpath/out.asc