The accuracy of deterministic models of interpolation in the process of generating a digital terrain model – The example of the Vrana Lake Nature Park

Abstract

The aim of this research is to choose the most appropriate interpolators for the purpose of geomorphologic research, by comparing 7 deterministic methods. For the purpose of developing a model and comparing interpolators, the research used a set of elevation data gathered by aero-photogrammetry and stereo-restitution. The accuracy of interpolation methods was tested by analysing 8 statistic parameters, which were obtained by methods of cross-validation, split sampling and jackknifing. Apart from analysing the parameters, the research also compared the interpolation methods by visual means, through graphic representation of data (two-dimensional and three-dimensional) on the basis of credible graphic representations of sets of data. The research also tested the effect of power, number of neighbours, distance and sectors on the quality of output data. The multiquadratic radial basis function (MQ-RBF) proved to be the best deterministic method of interpolation by all the relevant parameters.