This data contains abundant topographic, geomorphic and hydrological information within the five Central Asian countries, which can intuitively show the topographic and geomorphic characteristics of the region. Through DEM, a large number of surface morphology information can be extracted, such as slope, aspect, water system, etc. Aster GDEM 30 meter resolution elevation data comes from NASA, aster GDEM data uses UTM / WGS84 projection, data format is img grid image, data range is - 300-7445 meters, its vertical accuracy is 20 meters, horizontal accuracy is 30 meters. This data is the DEM data of the five Central Asian countries in the range of 45 ° - 108 ° E and 32 ° - 56 ° n in 2000.
The original data is provided by Kyrgyz map Bureau. The original data includes six elements: administrative division, city, railway, highway, water system, scenic spots and historic sites. The traffic classification standard is mainly Kyrgyz national standard. SRTM (Shuttle Radar Topography Mission) elevation data with a resolution of 30 meters are jointly measured by NASA and NIMA. The amount of radar image data acquired by SRTM system is about 9.8 trillion bytes. After more than two years of data processing, a digital terrain elevation model (DEM) is made, which is the current SRTM3 terrain product data.
Preprocessing: open DEM elevation data with arcmap10.2 software, and get DEM data of normal elevation value (- 227-7050m) through grid calculation and re classification calculation, and then get the data through cutting the border of five Central Asian countries. DEM rendering map processing: the DEM data after preprocessing is used to generate mountain shadow data (zfactor = 5), and the mountain shadow data and DEM data are superposed to generate DEM rendering map. The rendering image can be reprocessed by users according to their own needs.
This data set is processed with the data of the first version of Aster GDEM (V1). It is a digital elevation data product with a global spatial resolution of 30 meters. Due to the influence of cloud coverage, lines, pits, uplifts, dams or other anomalies caused by boundary stacking, there are local anomalies in the original data of the first version of Aster GDEM, so the digital elevation data products processed by aster gdemv1 have data anomalies in individual regions, which can be used in complementary ways with the global 90 meter resolution digital elevation data products.
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