HOWTO import USGS elevation data - Revision history

⚠️Madi at 14:08, 7 August 2013

2013-08-07T14:08:26Z

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	[[Category:FAQ]]		[[Category:FAQ]]
	[[Category: Import]]		[[Category: Import]]
			[[Category:HowTo]]

Neteler at 14:55, 20 December 2012

2012-12-20T14:55:49Z

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	[[Category:FAQ]]		[[Category:FAQ]]
			[[Category: Import]]

⚠️Landa at 19:36, 19 October 2012

2012-10-19T19:36:21Z

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	[[Category:FAQ]]		[[Category:FAQ]]
	~~[[Category:How to]]~~

⚠️Madi: /* Alternatives to the USGS DEM data */

2012-10-16T21:10:33Z

Alternatives to the USGS DEM data

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	[[Category:FAQ]]		[[Category:FAQ]]
			[[Category:How to]]

⚠️Ederickson: USGS now offers limited 1/9 arc-second coverage

2012-05-31T20:46:26Z

USGS now offers limited 1/9 arc-second coverage

← Older revision		Revision as of 20:46, 31 May 2012
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	The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. The highest resolution offered is 1/3 second (= about 10 meters) with coverage ~~of much~~ of the USA. Here is an approach to working with them in GRASS.		The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. The highest resolution offered is 1/9 second (= about 3 meters) with limited coverage of the USA. Most areas not covered by 1/9 arc-second are covered in 1/3 arc-second, with roughly 10-meter resolution. Here is an approach to working with them in GRASS.

	== Importing USGS 1/3 arc second NED datasets into GRASS ==		== Importing USGS 1/3 arc second NED datasets into GRASS ==

Neteler at 09:02, 20 May 2009

2009-05-20T09:02:32Z

← Older revision		Revision as of 09:02, 20 May 2009
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	==Alternatives to the USGS DEM data==		==Alternatives to the USGS DEM data==
	Other sources of digital elevation models include:		Other sources of digital elevation models include:
	* SRTM 90 data ~~in TIFF format from http://srtm.csi.cgiar.org/. These come in 5 degree by 5 degree tiles. Horizontal resolution: 3 arc second (90 m at equator). Coverage: world.~~		* SRTM: [[HOWTO import SRTM elevation data]]

	[[Category:FAQ]]		[[Category:FAQ]]

⚠️Hajhouse: 1/3 arc second = about 10 meters

2007-09-26T17:51:21Z

1/3 arc second = about 10 meters

← Older revision		Revision as of 17:51, 26 September 2007
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	The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. The highest resolution offered is 1/3 second (coverage: much of the USA). Here is an approach to working with them in GRASS.		The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. The highest resolution offered is 1/3 second (= about 10 meters) with coverage of much of the USA. Here is an approach to working with them in GRASS.

	== Importing USGS 1/3 arc second NED datasets into GRASS ==		== Importing USGS 1/3 arc second NED datasets into GRASS ==

⚠️Hajhouse: copyediting

2007-07-16T16:14:46Z

copyediting

← Older revision		Revision as of 16:14, 16 July 2007
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	The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. Here is an approach to working with them in GRASS.		The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. The highest resolution offered is 1/3 second (coverage: much of the USA). Here is an approach to working with them in GRASS.

	== Importing USGS 1/3" NED datasets into GRASS ==		== Importing USGS 1/3 arc second 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''' through the provided web interface. 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.'''
	<BR>From a GRASS shell:		<BR>Pick one DEM to start with. From a GRASS shell:
	: <code>cd 18437824/18437824</code> ''(example directory names --- replace with your actual names)''		: <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>		: <code>r.in.gdal location=''name_of_your_new_location'' in=w001001.adf out=dem</code>
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	: <code>grass name_of_your_new_location/PERMANENT</code>		: <code>grass name_of_your_new_location/PERMANENT</code>

	4. ~~Import~~ additional files as needed (note the <code>-e</code> flag, which causes the location's bounds to be extended to accomodate the new data):		4. If you have more than one DEM archive, import additional files as needed (note the <code>-e</code> flag, which causes the location's bounds to be extended to accomodate the new data):
	: <code>r.in.gdal -e in=w001001.adf out=dem2</code>		: <code>r.in.gdal -e in=w001001.adf out=dem2</code>
	: ''.. etc.''		: ''.. etc.''
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	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.

	~~Note that you can also download~~ SRTM 90 data in ~~tif~~ format from http://srtm.csi.cgiar.org/. These come in 5 degree by 5 degree tiles.		==Alternatives to the USGS DEM data==
			Other sources of digital elevation models include:
			* SRTM 90 data in TIFF format from http://srtm.csi.cgiar.org/. These come in 5 degree by 5 degree tiles. Horizontal resolution: 3 arc second (90 m at equator). Coverage: world.

	[[Category:FAQ]]		[[Category:FAQ]]

⚠️Gnelson at 19:20, 12 July 2007

2007-07-12T19:20:42Z

← Older revision		Revision as of 19:20, 12 July 2007
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	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.

			Note that you can also download SRTM 90 data in tif format from http://srtm.csi.cgiar.org/. These come in 5 degree by 5 degree tiles.

	[[Category:FAQ]]		[[Category:FAQ]]

⚠️Hajhouse: copyediting

2007-05-22T18:08:03Z

copyediting

← Older revision		Revision as of 18:08, 22 May 2007
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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.''' 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.'''
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	: <code>r.in.gdal location=''name_of_your_new_location'' in=w001001.adf out=dem</code>		: <code>r.in.gdal location=''name_of_your_new_location'' in=w001001.adf out=dem</code>

	3. (re)~~Start GRASS~~ in the new location.		3. '''Start GRASS''' (or restart) in the new location.
			: <code>grass name_of_your_new_location/PERMANENT</code>

	4. Import additional files as needed (note the <code>-e</code> flag ~~causing~~ the location's bounds to be extended ~~as needed~~):		4. Import additional files as needed (note the <code>-e</code> flag, which causes the location's bounds to be extended to accomodate the new data):
	: <code>r.in.gdal -e in=w001001.adf out=dem2</code>		: <code>r.in.gdal -e in=w001001.adf out=dem2</code>
	: ''.. etc.''		: ''.. etc.''