The ASTER along-track stereo experiment - a potential source of global DEM data in the late 1990'sIn addition to acquiring multispectral data, the Advanced Spaceborne Thermal Emission and Reflectance Radiometer (ASTER) will also acquire along-track stereo data. ASTER is capable of acquiring 771 digital stereo pairs per day, each covering 60 x 60 km on the ground, at 15 m resolution with a base/height ratio of 0.6.