As satellites take images of the earth continuously, they are expected to be a very important and reliable data source to monitor and describe urban areas and its changes. Hereby, detailed information on the third dimension is vital for identification of occluded and shaded areas, to label urban features and to describe urban morphology. Especially in mega-cities as Istanbul a lot of changes will appear in height.
A tri-stereoscopic based approach is followed to derive DSMs. As the stereo case is the minimum case for 3D mapping, the redundancy of an image triplet gives better constraints.
The resulting surface models and ortho-images will be used as an input for the high resolution land-cover mapping of Work package WP2. If the subsequent approach is proved to be successful, it will also increase the flexibility of producing semi-automatic 3D city models from high resolution satellite imagery.