DSM Generation from IKONOS Stereo Imagery.pdf

航測及遙測學刊 第十卷 第三期 第 265-274頁 民國 94年 9月 Journal of Photogrammetry and Remote Sensing Volume 10, 3, September 2005, pp. 265-274 265 DSM Generation from IKONOS Stereo Imagery Jiann-Yeou RAU1 Liang-Chien CHEN2 ABSTRACT Digital surface model generation from IKONOS stereo imagery is a new challenge in photogrammetric community, especially when the satellite company does not provide the raw data as well as their ancillary data. The IKONOS stereo images are provided in a quasi-epipolar geometry reference where only the terrain parallax in the scanner direction remains. A rigorous solution for orbit modeling is not practical. In this paper we utilized an estimated relief displacement azimuth and the nominal collection elevation data included in the metadata file to correct the relief displacement of GCPs, together with a linear transformation for geometric modeling of IKONOS imagery. Conjugate point correspondence problem is solved by a multi-resolution template-based image matching technique. Space intersection is performed by the trigonometric intersection assuming a parallel projection of IKONOS imagery due to its small FOV and frame size. In the experiment, less than 2-meters of RMSE is achieved denoting the potential positioning accuracy of the IKONOS stereo imagery. Key Words: Orbit Modeling, Digital Surface Model, and Image Matching 1. Introduction Due to its high spatial resolution, IKONOS imagery has high potential in large-scale topographic mapping. The generation of Digital Terrain Model (DTM) from remotely sensed stereo-images, such as aerial photos, satellite images, and airborne scanning images, is an important task for various remote sensing applications. The generated DTM from remotely optical sensor by image matching is actually the canopy of the earth surface, that means it include not only bare soil terrain but also trees, buildings, etc. So, the result is al