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A method of extracting bare-earth points from photogrammetric point clouds by partially using an existing lower resolution digital\udterrain model (DTM) is presented. The bare-earth points are extracted based on a threshold defined by local slope. The local slope is\udestimated from the lower resolution DTM. A gridded DTM is then interpolated from the extracted bare-earth points. Five different\udinterpolation algorithms are implemented and evaluated to identify the most suitable interpolation method for such non-uniformly\udscattered data. The algorithm is tested on four test sites with varying topographic and ground cover characteristics. The results are\udevaluated against a reference DTM created using aerial laser scanning. The deviations of the extracted bare-earth points, and the\udinterpolated DTM, from the reference DTM increases with increasing forest canopy density and terrain roughness. The DTM created\udby the method is significantly closer to the reference DTM than the lower resolution national DTM. The ANUDEM (Australian\udNational University Digital Elevation Modelling) interpolation method is found to be the best performing interpolation method in\udterms of reducing the deviations and in terms of modelling the terrain realistically with minimum artefacts, although the differences\udamong the interpolation methods are not considerably large

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

BARE-EARTH EXTRACTION AND DTM GENERATION FROM PHOTOGRAMMETRIC POINT CLOUDS WITH A PARTIAL USE OF AN EXISTING LOWER RESOLUTION DTM