PECULIARITIES OF USING THE EARTH REMOTE SENSING DATA AND GIS-TECHNOLOGIES TO ANALYSE THE AGROLANDSCAPE RELIEF
For increase the efficiency of agricultural production, it is necessary to carry out a detailed differentiation of farming systems based on the agro-ecological conditions of landscapes. The main factors determining the functioning of landscapes as geosystems are: relief, lithology, soil cover, climate, vegetation. Their agroecological assessment is subject to landscape-ecological analysis. For effective terrain analysis it is necessary to use modern geographic information technologies (GIS) and remote sensing data. Using the arable land of the Trynovsky district of the Stavropol Region, which has high agricultural development (the arable land area is 77% of the total area) the SRTM digital elevation model (DEM) efficiency is proved compared to the ASTER model. When using the SRTM DEM for terrain analysis, it is necessary to adjust it to eliminate local elevations of the terrain in areas where vegetation is located, and in particular, shelter belts. The adjustment of the DEM is carried out by GIS methods such as overlay, spatial sampling, creation of buffer zones and interpolation. The accuracy of the corrected DEM was assessed by modeling the main watercourses in the study area and comparing them with actual erosion. The accuracy of the corrected DEM SRTM and the fact was 63% compared with the initial DEM SRTM, which coincided by 41%. The corrected DЕM was used to analyze the slope of arable land and found that, compared to the initial DEM, the area with a slope of <1° increased from 41% to 54%, and the average slope of arable land decreased from 1.26° to 1.06°. The revealed changes in the distribution of areas depending on the slope allow a more efficient agro-ecological assessment of land.