HGT 2 STL Converter
by DWilbourn, published
A small program to read Digital Elevation Model HGT files (Space Shuttle Radar Tomography) or Image files and convert them to STLs
*v0.3.0.0 Added support for importing images. These are converted to greyscale and can then be converted to STLs
- Added a 'base' option that can be trimmed to the object / landmass or cover the full extend of the area.
- Redesigned the interface.
v 0.2.0.0 Rounding error caused some latitudes to generate errors. Fixed in this version.
v 0.1.1 Improved error checking - errors can send an error report to me if you choose.
HTG files can be downloaded from http://www.viewfinderpanoramas.org/dem3.html. on the map (http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm) select an area to download the zipped tiles for that area. Unzip and select a tile in HGT2STL.exe. A greyscale image of the tile is shown. Water (or actually height = 0) is blue. Draw over an area to export just a portion of the map, set 'Desample' to reduce the resolution of the map. Select 'Save as ASCII STL' to output a map.
The program is - and will only ever be - Windows only! Sorry, but that is what I know and use. (Delphi XE3 source is available)
Generated STLs are ASCII format. I may add binary in the future - time and interest permitting....
Max resolution for these maps is about 1 facet = 90m. Higher res DEMs are available - for a price! This porgram can only read the HGT format though.
Program is quick & dirty - almost NO error checking!
PBill4.zip & La Palma are zipped ASCII STLs of the maps shown in the screenshots.