HOWTO import USGS elevation data: Difference between revisions
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== Importing USGS 1/3" NED datasets into GRASS == | == Importing USGS 1/3" NED datasets into GRASS == | ||
1. Download the datasets you desire. | 1. Download the datasets you desire. They will arrive in a zip archive of a directory containing a subdirectory containing a file called w001001.adf, which is the main data file (tip: this is the biggest file). | ||
2. '''Create a new GRASS location to work with the DEMs.''' | 2. '''Create a new GRASS location to work with the DEMs.''' | ||
Revision as of 01:35, 10 May 2007
The US Geological Survey offers a variety of digital elevation models through the "Seamless Distribution System. Here is an approach to working with them in GRASS.
Importing USGS 1/3" NED datasets into GRASS
1. Download the datasets you desire. They will arrive in a zip archive of a directory containing a subdirectory containing a file called w001001.adf, which is the main data file (tip: this is the biggest file).
2. Create a new GRASS location to work with the DEMs.
From a GRASS shell:
cd 18437824/18437824(example directory names --- replace with your actual names)r.in.gdal location=name_of_your_new_location in=w001001.adf out=dem
3. (re)Start GRASS in the new location.
4. Import additional files as needed:
r.in.gdal in=w001001.adf out=dem2- .. etc.
5. Use r.patch to combine the tiles into one continuous map, if desired.