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Cho_Oyu_Ngozumpa_Glacier_1.jpg
Cho_Oyu_Ngozumpa_Glacier_2.jpg
README.md
cho_oyu_ngozumpa_everest.tif
cho_oyu_ngozumpa_everest_ne.tif
cho_oyu_ngozumpa_everest_nw.tif
cho_oyu_ngozumpa_everest_se.tif
cho_oyu_ngozumpa_everest_sw.tif
ngozumpa.blend
ngozumpa_mesh.blend
ngozumpa_ne_print.stl
ngozumpa_nw_print.stl
ngozumpa_se_print.stl
ngozumpa_sw_print.stl

README.md

Cho Oyu and Ngozumpa Glacier

Cho Oyu, 6th highest mountain in the world, and the Ngozumpa glacier below it. Model has 4 quadrants (NW, NE, SW, SE) including Cho Oyu and the north end of Ngozumpa (NW), the southern end of Ngozumpa (SW), and two quadrants to the east including Mt. Everest (NE and SE). I printed the NW and SW quadrants for a friend's expedition to study the glacier.

See Mt. Everest from SRTM Data for instructions on making your own.

This model is public domain.

Instructions

The models were produced using Shuttle Radar Topography Mission 90-m resolution data. I am posting Blender models - as displacement maps and as meshes - as well as the STL files. STL files are scaled for printing on a Makerbot Cupcake CNC with recessed screws.

I used all open source tools:

  • Geospatial Data Abstraction Library (GDAL) to convert SRTM HGT files to GEOTIFF
  • GIMP to crop the GEOTIFFs
  • Blender to produce displacement maps from the GEOTIFFS and meshes
  • Meshlab to close the holes

I found that the default scale of the Blender displacement maps was too flat. I did a test print and used calipers to get the scale right. Each pixel in X/Y is 90-m. To get the vertical relief correct, I measured the height of known parts of the map (summit of Cho Oyu and a nearby valley) and compared this to terrain maps in Google maps and the width of the model (200 pixels multiplied by 90m).