Experimental Studies into Automated Dtm Generation on the Dpw770

In this paper the accuracy of automatic DTM computation on the digital photogrammetric workstation DPW770 of LeicaHelava will be discussed. The software component of the photogrammetric System is the Softcopy Exploitation Tool (SOCET SET) by Helava, with module "Terrain". Basis for the investigation was a test data set (image scale 1:13000) of the Institute for Photogrammetrie of Stuttgart University, originally provided for an OEEPE test " Experimental Investigation into Automatic DTM-Generation". The two different possibilities for automatic DTM generation with SOCET SET, the non-adaptive method and the adaptive method, will be explored and compared. Investigated was the accuracy in a stereo model with rough topography and most different land use. In order to be able to determine the accuracy of automatically calculated elevations, a data set consisting of some 2700 check points was made available. The check points are distributed in a symmetric raster with 25 m grid distance and, for a more detailed analysis, are additionally furnished with attributes such as land use, terrain roughness, and texture. In order to be able to make a statement about the optimal scanner resolution, test data sets with resolution of 15 μm, 30 μm and 60 μm were also made available.