HOWTO import USGS elevation data: Difference between revisions
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(→Importing USGS 1/3" NED datasets into GRASS: formatting) |
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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. 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). | 1. Download the datasets you desire. '''''[link please]''''' 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)'' | 2. '''Create a new GRASS location to work with the DEMs.''' | ||
: r.in.gdal location=''name_of_your_new_location'' in=w001001.adf out=dem | <BR>From a GRASS shell: | ||
3. Start GRASS in the new location. | : <code>cd 18437824/18437824</code> ''(example directory names --- replace with your actual names)'' | ||
: <code>r.in.gdal location=''name_of_your_new_location'' in=w001001.adf out=dem</code> | |||
3. (re)Start GRASS in the new location. | |||
4. Import additional files as needed: | 4. Import additional files as needed: | ||
: r.in.gdal in=w001001.adf out=dem2 | : <code>r.in.gdal in=w001001.adf out=dem2</code> | ||
: ''.. etc.'' | : ''.. etc.'' | ||
5. Use r.patch to combine the tiles into one continuous map, if desired. | 5. Use r.patch to combine the tiles into one continuous map, if desired. | ||
[[Category:FAQ]] | [[Category:FAQ]] | ||
Revision as of 01:34, 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. [link please] 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.