Tech:Elevation

From Cyclopath

Cyclopath uses elevation to help cyclists find and evaluate routes. The elevation data for cyclopath was retrieve from from the US Geological Survey. The National Elevation Dataset (NED) at 1/3 arcsecond was used. Elevation geotiffs can be downloaded from the USGS Seamless Server in 150MB chucks. Cyclopath requires all elevation data to be contained in a single file. The gdal-bin package provides useful tools for merging multiple geotiffs into one file. Use ./gdal_merge.py to merge multiple geotiff files into one.

 ./gdal_merge.py -o <outfile> partial1 partial2 partial3

Once the files have been merged the pyserver elevation_tiff variable in CONFIG should be updated to the new elevation file.