[Personnel: Last_Name='STEVENS', Middle_Name='B.', First_Name='TYLER']
1:24,000 Scale Digital Elevation Models (DEM) SDTS format only from the U.S. Geological SurveyEntry ID: USGS_DEM24K
Abstract: The DEM data for 7.5-minute units correspond to the USGS 1:24,000 and
1:25,000 scale topographic quadrangle map series for all of the United
States and its territories. Each 7.5-minute DEM is based on 30- by
30-meter data spacing with the Universal Transverse Mercator (UTM)
projection. Each 7.5- by 7.5-minute block provides the same coverage as
the standard USGS 7.5-minute map series.
The ... 7.5-minute Alaska DEM data correspond to the USGS 1:24,000 and 1:25,000
scale topographic quadrangle map series of Alaska by unit size. The unit sizes
in Alaska vary depending on the latitudinal location of the unit. The
7.5-minute Alaska DEM data consist of a regular array of elevations referenced
horizontally to the geographic (latitude/longitude) coordinate system of the
North American 1927 Datum (NAD 27) or the North American 1983 Datum (NAD 83).
The spacing between elevations along profiles is 1 arc second in latitude by 2
arc seconds of longitude.
As of November 14, 2006, the USGS no longer offers Digital Elevation Models. For the most recent elevation coverage, please see the National Elevation Dataset.
Data Set Citation
Dataset Originator/Creator: U.S. Geological Survey
Dataset Title: 7.5-Minute Digital Elevation Model (DEM)
Dataset Release Date: 1979-07-01
Dataset Release Place: Reston, VA
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: Maps
LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > CONTOUR MAPS
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS
TERRESTRIAL HYDROSPHERE > SURFACE WATER > HYDROPATTERN
TERRESTRIAL HYDROSPHERE > SURFACE WATER > LAKES
TERRESTRIAL HYDROSPHERE > SURFACE WATER > RIVERS/STREAMS
LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM)
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be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions.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
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
U.S. Geological Survey, 1993, Digital elevation models--data users
guide 5: [Reston, Virginia], U.S. Geological Survey, 48 p.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2001-02-08
Last DIF Revision Date: 2015-06-11