DSM Generation and Interior Orientation Determination of IKONOS Images Using a Testfield in Switzerland

Abstract

Abstract: We present processing of IKONOS triplet images over a testfield in Thun, Switzerland with accurate ground control points, 1600 m height range, variable land cover and suboptimal imaging conditions (snow, long shadows). A sophisticated matching algorithm for DSM generation is presented and the results are compared to reference data from airborne laser scanning. The RMS errors for the whole area, excluding vegetation, were 2-3 m, while for bare ground the accuracy is about 1 m or less. The accurate matching allowed the detection and quantification of errors in the interior orientation of the sensor, caused by changes in the relative position of the 3 CCDs forming the virtual CCD