APPLYING THE INVERSE DISTANCE WEIGHTING AND KRIGING METHODS OF THE SPATIAL INTERPOLATION ON THE MAPPING THE ANNUAL PRECIPITATION IN BOSNIA AND HERZEGOVINA

Two methods of the spatial interpolation [Inverse Distance Weighting(IDW) and the Kriging], often used in the Geographical Information System (GIS),have been applied on the mapping of the annual amount of precipitation in Bosniaand Herzegovina. For that purpose the monthly precipitation data obtained frommeteorological network in the period 1960-2011. The validation of the analyzeddata has been carried out by using 20-meter resolution Digital Elevation Model(DEM). The methods, which are suitable for the spatial interpolation for Bosnia andHerzegovina area, particularly for the orographic regions, were analyzed. First, theIDW linear interpolator was considered. However, in the mountain region, thismethod can give unrealistic results („Bulls Eyes“ effect). Namely, this effect leadsto occurrence of the isohyets, which are closed around the meteorological stationthat is not acceptable in analysis of the pluviometric regime in the real relief. Incontrast to this method the Kriging method is much more acceptable because ofits (i) adaptability to the relief configuration, (ii) fast data processing and (iii) highprecision in calculating the precipitation and corresponding climate indexes for thehigh resolution of the grid cell. An acceptable annual pluviometric model with the50x50 m resolution has been obtained by the application of the Kriging method,which was applicable at the local spatial scale, particularly in the orographicregions. More precisely, the designed annual pluviometric model is characterizedby the high precision in the areas with the pronounced relief dynamics, where theenergetic classes are above 6th category.