The SRTM (Space Shuttle Radar topographic mapping mission) was initiated in February 2002 by NASA, the Geospatial Intelligence Agency, and space agencies in Germany and Italy. A total of 222 hours and 23 minutes of data acquisition work were carried out by the SRTM system carried out by the space shuttle Endeavour of the United States. The 9.8 trillion bytes of radar image data with an area of more than 119 million km2 between 60 degrees and 56 degrees south latitude in North America were obtained. The data set covers more than 80% of the earth's surface, covering the whole territory of China. It took two years to process, and finally a global digital elevation model (DEM) with plane longitude of ± 20 m and elevation longitude of ± 16 m was obtained
SRTM data provides one file for each longitude and latitude grid, with longitude of 1 arc second and 3 arc second. It is called srtm1 and SRTM3, or 30m and 90m data. SRTM3 data of 90m resolution is used in this data set. Each file contains elevation data of 1201 × 1201 sampling points. The data format is DEM format. See the attached figure for the spatial location of each map (1 × 250000 maps in China).
The data set covers the whole territory of China. After two years of processing, the global digital elevation model (DEM) with plane longitude of ± 20 m and elevation longitude of ± 16 m was finally obtained
The processing of SRTM data is completed by ground data processing system (GDPs). GDPs is composed of three parts: (1) interferometry processor, which converts data into elevation map and radar image stripe; (2) mosaic processor, which is used to compile the collected global multiple flight strip data into mosaic map of continental elevation data and image; (3) verification system, which is responsible for checking the quality of mosaic map and providing accuracy map. These processors are currently installed on JPL workstations, and the next step is to install them on a set of supercomputers for system processing of real SRTM data. As this work progresses, JPL will publish the auxiliary data to the work.
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CSTR:11738.11.ncdc.nieer.2020.1535
10.12072/ncdc.nieer.db3067.2023