The National Map - Revision history

Paulg: /* Using the Gridfloat data in Pathloss 5 */

2012-12-21T19:25:21Z

‎Using the Gridfloat data in Pathloss 5

Paulg: /* Prepackaged Gridfloat download */

2012-12-21T19:18:46Z

‎Prepackaged Gridfloat download

Paulg at 19:14, 21 December 2012

2012-12-21T19:14:10Z

Chrisg: /* How to download */

2012-09-27T19:53:34Z

‎How to download

Chrisg: /* How to download */

2012-09-25T17:12:13Z

‎How to download

Chrisg: /* How to download */

2012-09-25T17:11:28Z

‎How to download

Chrisg: /* How to download */

2012-09-25T17:10:18Z

‎How to download

Chrisg: /* How to download */

2012-09-25T17:08:03Z

‎How to download

Chrisg at 17:05, 25 September 2012

2012-09-25T17:05:05Z

Chrisg: Created page with "'''To go directly to the NED download page, go here: http://seamless.usgs.gov/website/seamless/viewer.htm''' The National Elevation Dataset (NED) is a new raster product assemb..."

2012-09-25T17:02:54Z

Created page with "'''To go directly to the NED download page, go here: http://seamless.usgs.gov/website/seamless/viewer.htm''' The National Elevation Dataset (NED) is a new raster product assemb..."

New page

'''To go directly to the NED download page, go here: http://seamless.usgs.gov/website/seamless/viewer.htm'''

The National Elevation Dataset (NED) is a new raster product assembled by the U.S. Geological Survey. NED is designed to provide National elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections were made in the NED assembly process to minimize artifacts, perform edge matching, and fill sliver areas of missing data. NED has a resolution of one arc-second (approximately 30 meters) for the conterminous United States, Hawaii, and Puerto Rico and a resolution of two arc-seconds for Alaska. More info can be found at http://gisdata.usgs.net/NED/.

SRTM 30m and SRTM 90m data is also available from the the USGS Seamless Distribution site. Information on the SRTM data can be found at http://srtm.usgs.gov/ .
== How to download ==
The data can be downloaded at http://viewer.nationalmap.gov/viewer/.

There is online help available by clicking on the '''Tutorial''' link in the header of the page.

* Select the '''Download''' tab on the right hand side of the display.

* Check the boxes for '''NED, 1/3 NED''' or '''1/9 NED'''.

[[File:sdds_select.JPG]]

* Using the Zoom tool, you can zoom into the area you are interested in.

* Define the area by either clicking the '''Define Download Area by Coordinates''' tool under '''Download''' tool group.

[[File:sdds_download.JPG]]

* If using the '''Define Download Area by Coordinates''', a dialog will appear that is used to define an area for download. (The example shown is for a 1X1 degree block)

[[File:sdds_define.JPG]]

* Once the area is defined you will be taken to the download page. You will need to click "Modify Data Request" and change the format to the '''BIL_16INT''' format. Click '''Save Changes & Return to Summary'''.

* Click '''Download'''. You will be prompted to save the file once it is ready for download

== How to use the seamless NED data with the Pathloss program. ==
Decompress the dataset to its own directory. The dataset is comprised of 16 files…

*.aux *.hdr METADATA.dbf Metadata.xml
*.bil *.prj METADATA.prj NED DataDictionary.pdf
*.bil.aux.xml *.stx METADATA.shp NED_Release_Notes_June10.pdf
*.blw meta1.html METADATA.shx output_parameters.txt

In Version 4.0 make sure to use NED CONUS for data in Alaska. Do not use NED Alaska.

The NED (CONUS) data uses the NAD83. NAD27 Coordinates are transformed automatically.

The SRTM data uses the WGS84. NAD83 and NAD27 Coordinates are transformed automatically.

* In the Pathloss program click '''Configure''' – '''Terrain Database''' and depending on the dataset select either '''NED CONUS'''or '''NED Alaska''' from the drop down list.

* Click '''Setup Primary''' (or '''Setup Secondary''' depending on your selection).

* Click the file button and browse to find and load the file with the BIL extension. The program is now setup to use the selected BIL file.

@@ Line 20: / Line 20: @@
 ==Using the Gridfloat data in Pathloss 5==
-Click Configure -> Setup GIS Configuration
+Click Configure -> Setup GIS Configuration and configure the primary DEM
 ==Using the seamless NED data with Pathloss 4==

@@ Line 8: / Line 8: @@
 The National Elevation Dataset (NED) is a new raster product assembled by the U.S. Geological Survey. NED is designed to provide National elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections were made in the NED assembly process to minimize artifacts, perform edge matching, and fill sliver areas of missing data. NED has a resolution of one arc-second (approximately 30 meters) for the conterminous United States, Hawaii, and Puerto Rico and a resolution of two arc-seconds for Alaska. More info can be found at http://gisdata.usgs.net/NED/.
-==Prepackaged Gridfloat download==
+==Prepackaged Gridfloat 1" and 1/3" data download==
 http://cumulus.cr.usgs.gov/webappcontent/neddownloadtool/NEDDownloadTool.html
 ==Using the Gridfloat data in Pathloss 5==

@@ Line 1: / Line 1: @@
-'''To go directly to the National Map viewer page, go here: http://viewer.nationalmap.gov/viewer/'''
+'''Important Note regarding the National Map Viewer'''
 The National Elevation Dataset (NED) is a new raster product assembled by the U.S. Geological Survey. NED is designed to provide National elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections were made in the NED assembly process to minimize artifacts, perform edge matching, and fill sliver areas of missing data. NED has a resolution of one arc-second (approximately 30 meters) for the conterminous United States, Hawaii, and Puerto Rico and a resolution of two arc-seconds for Alaska. More info can be found at http://gisdata.usgs.net/NED/.
-SRTM 30m and SRTM 90m data is also available from the the USGS Seamless Distribution site. Information on the SRTM data can be found at http://srtm.usgs.gov/ .
+==Prepackaged Gridfloat download==
-== How to download ==
-The data can be downloaded at http://viewer.nationalmap.gov/viewer/.
-−
-There is online help available by clicking on the '''Tutorial''' link in the header of the page.
-−
-* Select the '''Download''' button, located on the top right hand side of the display.
-−
-* Select which download template to use.'''.
-−
-−
-[[File:Natmap-1.jpg]]
-−
-−
-* Using the Zoom tool, you can zoom into the area you are interested in.
-−
-* Select the area by clicking the template area desired.
-−
-−
-−
-[[File:Natmap-2.jpg]]
-−
-−
-−
-* Select the types of data required. Use the '''BIL_16INT''' format for NED data and '''BIL''' for Land COver data.
-−
-−
-[[File:Natmap-3.jpg]]
-−
-* Select from the available data for the requested area. Use '''Best Avaiable''' and '''Dynamic'''.
+http://cumulus.cr.usgs.gov/webappcontent/neddownloadtool/NEDDownloadTool.html
+Click Configure -> Setup GIS Configuration
-== How to use the seamless NED data with the Pathloss program. ==
+==Using the seamless NED data with Pathloss 4==
 Decompress the dataset to its own directory. The dataset is comprised of 16 files…

← Older revision		Revision as of 17:12, 25 September 2012
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	* Define the area by either clicking the '''Define Download Area by Coordinates''' tool under '''Download''' tool group.		* Define the area by either clicking the '''Define Download Area by Coordinates''' tool under '''Download''' tool group.
		+
		+

	[[File:Natmap-2.jpg]]		[[File:Natmap-2.jpg]]
		+

@@ Line 22: / Line 22: @@
 * Define the area by either clicking the '''Define Download Area by Coordinates''' tool under '''Download''' tool group.
+[[File:Natmap-2.jpg]]
-[[File:sdds_download.JPG]]
@@ Line 29: / Line 28: @@
-[[File:sdds_define.JPG]]
+[[File:Natmap-3.jpg]]

← Older revision		Revision as of 17:08, 25 September 2012
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−	[[File:~~sdds_select~~.~~JPG~~]]	+	[[File:Natmap-1.jpg]]

← Older revision		Revision as of 17:05, 25 September 2012
Line 1:		Line 1:
−	'''To go directly to the ~~NED download~~ page, go here: http://~~seamless~~.~~usgs~~.gov~~/website/seamless~~/viewer~~.htm~~'''	+	'''To go directly to the National Map viewer page, go here: http://viewer.nationalmap.gov/viewer/'''