National Elevation Database, N39 W117 (NEVADA)

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. Where did the data come from?
  2. What changes have been made?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title: National Elevation Database, N39 W117 (NEVADA)

Abstract:

The U.S. Geological Survey has developed a National Elevation Database (NED). The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to the NAD83 datum, edge-match, and fill slivers of missing data at quadrangle seams. One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives.

If you'd like to download the NED data for this area (SE corner: N39 W117) from the Keck Earth Science and Mining Research Center (served by the University of Nevada, Reno library system), follow this link: <http://keck.library.unr.edu/data/neds/39117.htm>

1. How should this data set be cited?

   U.S. Geological Survey (USGS), EROS Data Center, 1999, National Elevation Database, N39 W117 (NEVADA): U.S. Geological Survey, Sioux Falls, SD.

   Online Links:

   • <http://keck.library.unr.edu/data/neds/39117.htm>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: 118.000

   East_Bounding_Coordinate: 117.000

   North_Bounding_Coordinate: 40.000

   South_Bounding_Coordinate: 39.000

3. What does it look like?

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 01-Feb-1999

   Ending_Date: Unknown

   Currentness_Reference: publication date

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: raster digital data

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Raster data set.

   2. What coordinate system is used to represent geographic features?

7. How does the data set describe geographic features?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey (USGS), EROS Data Center

2. Who also contributed to the data set?

3. To whom should users address questions about the data?

Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.

1. Where did the data come from?

2. What changes have been made?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints:

None. Acknowledgement of the originating agencies would be appreciated in products derived from these data.

1. Who distributes the data set? (Distributor 1 of 1)

   Customer Services Representative
   EROS Data Center
   U.S. Geological Survey
   EROS Data Center
   Sioux Falls, SD 57198
   USA
   

   605-594-6151 (voice)
   605-594-6589 (FAX)
   custserv@edcmail.cr.usgs.gov
   

2. What's the catalog number I need to order this data set?

   National Elevation Database (NED)

3. What legal disclaimers am I supposed to read?

   Although these data have been processed successfully on a computer system at the U.S. Geological Survey, EROS Data Center, no warranty expressed or implied is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The USGS will warrant the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustments of credit must be made within 90 days from the date of this shipment from the ordering site.

4. How can I download or order the data?

Dates:

Last modified: 11-Feb-1999

Metadata author:

Customer Services Representative
EROS Data Center
U.S. Geological Survey
EROS Data Center
Sioux Falls, SD 57198
USA

605-594-6151 (voice)
605-594-6589 (FAX)
custserv@edcmail.cr.usgs.gov

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998 Description of source data: NED tiles are stored as arc/info grids. Each tile covers a 1x1 degree area of the earth's surface. Example Grid information: dem10148 Cell size: one arc-second Data type: Floating Point Number of rows: 3600 Number of columns: 3600 Projection: Geographic Datum: NAD83 Units: Decimal Degrees Zunits: Meters Spheroid: GRS1980 VIEWING Tiles: No software for viewing NED tiles are included on this disc. Free software for viewing other USGS digital cartographic data are available at the following internet sites: dlgv32 is Windows95/NT software for viewing a variety of USGS geospatial data including GeoTIFF Tiles. <http://mcmcweb.er.usgs.gov/viewers/dlg_view.html> Arc Explorer is a free lightweight GIS data explorer developed by ESRI. <http://www.esri.com/software/arcexplorer/index.html> PCI Freeware Handler is an application for viewing, enhancing and examining remotely sensed imagery such as LANDSAT, SPOT, RADARSAT, ERS-1, NOAA AVHRR, aerial photography. The Freeware Handler is freeware, and is offered by PCI to the remote sensing community as a public service. <http://www.pcigeomatics.com/downl.html#FREEWARE>)