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The geographic information system (GIS) allows combining a database about the object and its geographic location with the result from the impact of the working bodies of the machines on the soil. Based on this, working layers are created, which allow visualization of the output parameters of the process.
The aim of the study is a comparative analysis of three methods for creating surfaces in GIS at optimizing the aggregate composition of soils with different clay content.
The subject of the study are agricultural areas on the land of the town of Banya in the region of Plovdiv. The analysed areas are on Dystric-Fluvisols and Eutric Fluvisols. A map of the restored ownership of the land and a soil map of the town of Banya have been used to present the results in GIS.
Thee quations, derived by statistical methods,for fragmenting the aggregate composition of the soil of the three soil types are integrated into the system. Three methods of spatial analysis and interpolation of the data in GIS have been used – IDW, Spline and Kriging.
As a result maps of spatial distribution for the aggregate composition of the soil at a fraction of 1 to 25 mm as a percentage have been made. Comparative analysis of the three methods has been done and they have been classified according to accuracy.