Shuttle Radar Topography Mission 1-arc second GlobalEntry ID: SRTMGLOBAL1N
Abstract: The Shuttle Radar Topography Mission (SRTM) was flown aboard the space shuttle Endeavour February 11-22, 2000. The National Aeronautics and Space Administration (NASA) and the National Geospatial-Intelligence Agency (NGA) participated in an international project to acquire radar data which were used to create the first near-global set of land elevations.
The radars used during the SRTM mission ... were actually developed and flown on two Endeavour missions in 1994. The C-band Spaceborne Imaging Radar and the X-Band Synthetic Aperture Radar (X-SAR) hardware were used on board the space shuttle in April and October 1994 to gather data about Earth's environment. The technology was modified for the SRTM mission to collect interferometric radar, which compared two radar images or signals taken at slightly different angles. This mission used single-pass interferometry, which acquired two signals at the same time by using two different radar antennas. An antenna located on board the space shuttle collected one data set and the other data set was collected by an antenna located at the end of a 60-meter mast that extended from the shuttle. Differences between the two signals allowed for the calculation of surface elevation.
Endeavour orbited Earth 16 times each day during the 11-day mission, completing 176 orbits. SRTM successfully collected radar data over 80% of the Earth's land surface between 60° north and 56° south latitude with data points posted every 1 arc-second (approximately 30 meters).
Two resolutions of finished grade SRTM data are available through EarthExplorer from the collection held in the USGS EROS archive:
1 arc-second (approximately 30-meter) high resolution elevation data offer worldwide coverage of void filled data at a resolution of 1 arc-second (30 meters) and provide open distribution of this high-resolution global data set. Some tiles may still contain voids. The SRTM 1 Arc-Second Global (30 meters) data set will be released in phases starting September 24, 2014. Users should check the coverage map in EarthExplorer to verify if their area of interest is available.
3 arc-second (approximately 90-meter) medium resolution elevation data are available for global coverage. The 3 arc-second data were resampled using cubic convolution interpolation for regions between 60° north and 56° south latitude.
[Summary provided by the USGS.]
Purpose: SRTM data is being used to generate a digital topographic map of the Earth's land surface with data points spaced every 1 arc second of latitude and longitude (approximately 30 meters).
Data Set Citation
Dataset Originator/Creator: National Geospatial-Intelligence Agency (NGA)
Dataset Title: Shuttle Radar Topography Mission 1-arc second Global
Dataset Publisher: USGS Earth Resources Observation and Science (EROS)
Version: Not providedOnline Resource: http://srtm.usgs.gov/mission.php
Start Date: 2000-02-11Stop Date: 2000-02-22
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
Distribution Media: Digital Download
Distribution Format: BIL, DTED or GeoTIFF
Fees: Free download of finished grade data.
Role: METADATA AUTHOR
Email: kkline at usgs.gov
City: Sioux Falls
Province or State: SD
Postal Code: 57198
Role: TECHNICAL CONTACT
Phone: 605-594-6151, 800-252-4547
Email: lta at usgs.gov
LTA Customer Services U.S. Geological Survey EROS Center 47914 252nd Street
City: Sioux Falls
Province or State: SD
Postal Code: 57198-0001
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2014-09-26
Last DIF Revision Date: 2019-03-25