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Course program and control of variational baseline digital aerial photography based on DEM

DUAN Fu-zhou 1,2,GONG Hui-li 1,ZHU Lin2(1.Key Laboratory of 3D Information Acquisition and Application,Capital Normal University,Beijing 100037,China;2.Beijing Key Laboratory for Resources Environment and GIS,Capital Normal University,Beijing 100037,China)  
Usually,the baseline in traditional photogrammetry is equidistant.In the plain region,the aerial photography with equidistant baseline is adaptive,but in the hills,mountains and other largely fluctuated regions,the elevation fluctuation influence the overlap rate on the forward and lateral direction.A variational baseline design of the course based on 1:250000 DEM and high accuracy position exposure in which the error is less than 5 meters or 2% of the baseline distance is expounded.The method so called exposure point adjustment is taken to design DEM-based variable baseline.It emphasizes on intelligent positioning exposure,which solves the problems brought by deviant GPS signals,satellite lost locks or GPS coordinates jumping.
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