2-Arc-Second (30-Minute Digital Elevation Model) Quadrangle
Entry ID: DEM_30

[ Get Data ]
[ Update this Record ]

Abstract: Digital Elevation Model (DEM) is the terminology adopted by the USGS
to describe terrain elevation data sets in a digital raster form.
The standard DEM consists of a regular array of elevations cast on a
designated coordinate projection system. The DEM data are stored as
a series of profiles in which the spacing of the elevations along
and between each profile is ... View entire text

Purpose: DEMs can be used as source data for digital orthophotos, and for
earth science analysis as layers in geographic information systems.
DEMs can also serve as tools for volumetric analysis, for site
location of towers, or for drainage basin delineation. These data
were collected as part of the National Mapping Program.

The 30-minute ... View entire text
Related URL
Description: Dataset searching and ordering capabilities are available through EarthExplorer.
Geographic Coverage
Spatial coordinates   
  N: 49.3   S: 24.5   E: -67.9   W: -124.7

Data Set Citation
Dataset Originator/Creator: U.S. Geological Survey
Dataset Title: 2-Arc-Second (30-Minute DEM)
Dataset Release Place: Reston, VA, USA
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: Maps
Online Resource: http://earthexplorer.usgs.gov
ISO Topic Category
Quality Attribute_Accuracy_Report:
The accuracy of a DEM depends upon the source level of detail and
the resolution of the data samples. The primary limiting factor for
the source level of detail is the scale of the source materials. The
proper selection of grid spacing determines the level of content
that may ... View entire text
Access Constraints None.
Use Constraints There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Data Set Progress
Originating Center
Data Center
Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior Supplemental Info
Data Center URL: http://eros.usgs.gov/

Data Center Personnel
Phone: 605-594-6151, 800-252-4547
Fax: 605-594-6589
Email: lta at usgs.gov
Contact Address:
LTA Customer Services
U.S. Geological Survey
EROS Center
47914 252nd Street
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Country: USA
Distribution Media: Digital Download
Fees: None
Phone: 605-594-6594
Fax: 605-594-6151
Email: lta at usgs.gov
Contact Address:
Long Term Archive
U.S. Geological Survey
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Country: USA
Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2001-06-01
Last DIF Revision Date: 2013-06-03
[ Update this Record ]

Link to Web Site