USING THE GEOMORPHOMETRIC ANALYSIS OF A RELIEF FOR CREATING A DATABASE OF FARMLANDS

The geomorphometric analysis of a relief was used to create a GIS database of farmlands by way of example of Omsk Region. The main sources of information on relief features were M 1:100000 and 1:50000 topographic maps. By the method of interpolating ANUDEM was developed a topologically correct digital model of a relief (DEM). The DEM contains the appropriate cards for the territory studied: hypsometric card; maps of the steepness and exposure of slopes; maps of plan, profile and general curvatures of the earth surface; cumulative runoff. The geomorphometric parameters characterizing the intensity of erosion processes (SPI index) and moistening of the territory (TWI index) were calculated. These geomorphometric parameters were used for the creation of the GIS database of farmlands. In terms of architecture, the database is a set of relational tables connected among themselves by “one-to-many” communications. Systematization of information on the relief was carried out in the GIS database with respect to the elementary surface topography. Elementary surfaces of the relief possess common properties of distribution of substance and energy flows over the earth surface, as they are selected taking into account characteristic lines and contrary flexure points in the relief. In the structure of the table of elementary surfaces of the relief, the fields that include quantitative and qualitative descriptions of geomorphometric parameters; data on soil types, free soil strata and the groundwater depth are defined. The unique identifier corresponding to the number of the elementary surface is used for implementing requests to attribute data of the tables.

GIS, database, farmlands, geomorphometric analysis, relief, topographic wetness index, stream power index

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