高程数据下载——DLR_SRTM_说明

翻译DLR文档

DLR SRTM X-SAR Digital Elevation Models

 

 

The German Aerospace Center DLR is making the SRTM X-SAR digital elevation models (DEMs) available at no cost. The data can be accessed in three ways

 

• Traditional search and ordering via the DLR Earth Observation data portal EOWEB-NG,
• FTP bulk download via EOWEB-NG
• Viewing (WMS) and download (WCS/WFS) via the EOC Geoservice

 

This document contains background information on the mission and the DEM products, on data access and data use. More detailed information can be obtained by following the links provided.

 

 

The Shuttle Radar Topography Mission - SRTM

 

The SRTM X-SAR DEMs were generated from X-band synthetic aperture radar (SAR) data acquired during the Shuttle Radar Topography Mission (SRTM) in 2000. The SRTM mission was conducted jointly between the German Aerospace Center DLR, the Italian Space Agency ASI, and NASA/JPL (USA). From February 11 to 22, 2000, two interferometric radar systems onboard the Space Shuttle Endeavor acquired data with the objective to generate a global high resolution digital elevation model. The American radar system, operating in C-band, was complemented by the German-Italian X-SAR, a higher resolution X- band synthetic aperture radar (SAR) system.

 

The SRTM DEMs were generated using 'radar interferometry' or 'InSAR'. Two SAR antennas, one inside the Space Shuttle cargo bay, the other at the end of a 60 m extension pole, simultaneously acquired radar data. During the processing, the phase differences of the two corresponding datasets are compared and converted into elevation values. An introduction to SAR interferometry can be found at this site.

 

The DLR SRTM website provides additional information on the SRTM X-SAR mission. Further details on the SRTM mission, on technology, accuracies, and applications are available on the NASA SRTM website and in this document.

 

While the DEMs generated from the American C-band data are available through the United States Geological Survey USGS and other sites, the X-SAR DEMs can be obtained via DLR.