ACCURACY ANALYSIS AND SURFACE MAPPING USING SPOT 5 STEREO DATA

On the Spot 5 satellite stereo data can be acquired simultaneously from the HRS (high resolution stereoscopic) instrument, which comprises 2 cameras looking forward and backward, respectively, at an off-nadir angle of ± 20 degrees. Enhanced along-track pixel resolution of 5 meters shall further assure a high accuracy with respect to 3D data extraction. In this concern, an HRS study team was installed and specific test sites designated in order to validate the geometric performance of Spot 5 HRS stereo data. This paper summarizes the results which have been achieved from the validation activities of the Institute of Digital Image Processing. The investigations were carried out using a test data set acquired over the city of Barcelona. Study areas showing different topographic characteristics have been investigated. Beside pure HRS stereo data, a glimpse has been further made onto the joint use of the HRS stereo data and a supermode THR image, which is basically a nadir scene with a pixel size of 2.5 meters.