Research On Precision Of Extracting Road Cross-section Data From Photogrammetric DEM

Photogrammetric DEM and cross-section based on the DEM are the bridges linking the photogrammetry and design, and also are the tie of integration of Survey and Design, combining the Photogrammetry, DEM and route CAD into an organic system. At present, trials and investigations on the precision of photogrammetric DEM and cross-section are few, and it hinder the further application of photogrammetric DEM and cross-section and become a bottleneck influencing the development of integration of Survey and Design.The thesis discusses the concept and application of DEM and acquiring methods of high precision DEM and route cross-section in details, detailedly describe the simultaneous acquiring methods of DLG and DEM, and also deduces and analyses the academic precision of cross-section based on photogrammetric DEM . Drawprofile module developed implements the cross-section extracting technique from photogrammetric DEM, and by the comparision and analysis of cross-sections from the photogrammetric DEM and field data collected, precision of cross-section based on the photogrammetric DEM is achieved. The thesis also describes the qulity-control measures, precision-improving methods and application range of cross-section based on photogrammetric DEM.The results that the thesis obtained offers certain reference and practical value for prompting application of cross-section based on the photogrammetric DEM and reducing field work.