Abstract
Digital Relief Model (DRM) is the name used officially in Croatia, and we distinguish between the original and derived DRM. Referring to the regular raster structure of elevations stored in the derived DRM, the term digital elevation model (DEM) was used for this model. Three geomorphometrically different landscapes have been tested. The elevation points were created using two methods, interpolation from the data obtained in the photogrammetric survey and image correlation, in two resolutions (5x5 and 25x25 meters). The paper presents the differences in the application of two methods of calculating DEM. The causes of differences discussed and the relative estimation of the accuracy of each method elaborated by comparing the height of points on new models with the heights on original DRM. The recommendation for the usage of the acceptable method is given related to the accuracy, the speed of data collection and a higher degree of automation.
Highlights
The definition of DRM as a set of positionally determined points and geometric elements that present the surface of the Earth and provide the calculation of the mathematical model of that surface [1] includes both the original and derived DRM
The so far made research has shown that the application of the method of image correlation with the resolution of 5×5 and 25×25 meters has not been researched in relation to the results obtained by means of interpolation
The method of image correlation is an automated procedure in which the programme identifies the identical details on images, which largely accelerates the procedure of capturing the rasters of elevation points
Summary
The definition of DRM as a set of positionally (and vertically) determined points and geometric elements (break lines, form lines and exclusion zones) that present the surface of the Earth and provide the calculation of the mathematical model of that surface [1] includes both the original and derived DRM. The samples having representative morphometric characteristics of the test area that we want to present using DRM are selected in the field These samples are observed with much larger spatial density (resolution) than it is the expected resolution of DRM, and the discretization density is determined by obtained small representative samples using the spectral analysis [2]. The creation of the digital elevation model with the resolution of 25×25 meters from the data of digital relief model (original DRM) using the method of interpolation has been done for the State Geodetic Administration (SGA). The so far made research has shown that the application of the method of image correlation (i.e. the application of automatic correlation needed in the production of digital elevation model) with the resolution of 5×5 and 25×25 meters has not been researched in relation to the results obtained by means of interpolation. The paper presents the comparison of DEM obtained using the method of interpolation from original DRM with the DEM obtained using image correlation from aerial images and aerotriangulation data
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