SPOT AND LANDSAT STEREO FUSION FOR DATA EXTRACTION OVER MOUNTAINOUS AREAS

In thematic and cartographic applications, planimetric features are ex tracted from multi-sensor images such as SPOT and Landsat in order to take advantage of their complimentarity features. When no precise elev ation data are available to ortho-rectify these images, e.g., in mount ainous areas, stereo digital photogrammetric workstations (stereo DPWS ) are now available for the interactive stereo fusion and plotting of multi-sensor stereo pairs. This paper presents a method and the quanti tative results on the extraction of planimetric and altimetric feature s from a stereo pair generated with mixed sensor images (SPOT-P and La ndsat TM) using the stereo DPWS, the DVP available at the Canada Centr e for Remote Sensing. Results from this mixed sensor stereo pair, whic h hits a base-to-height ratio of 0.49 and was taken over a mountainous area of the Rocky Mountains (Canada), show a planimetric accuracy of 11 to 12 m for well identified cartographic features, and an altimetri c accuracy of 37 m for the extracted elevation data.