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21 October 1996 New approach to ASTER orthoimage generation
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Orthoimage products are planned to be produced at ASTER ground data system (GDS), this will be useful for general applications users. The major problem in orthoimage generation is a big computation load for terrain correction. In this paper, a high speed orthoimage generation method is proposed. The proposed method is based on the next four basic ideas: (1) The DEM products produced at ASTER GDS are used as fundamental information for terrain correction. ASTER DEM is generated by stereo matching on the basis of area correlation algorithm. Therefore the terrain correction for every pixel is ineffective. (2) As ASTER DEM products have ground coordinates corresponding to every other pixel on observation images, it is easy to transform observation image coordinates into orthoimage coordinates by using the ECR coordination. (3) In order to eliminate iterative calculations for determination of relations from orthoimage coordinate to observation coordinate, inverse transformations are directly obtained from relationship between a block on the observation image and its projection onto the orthoimage coordinate system. (4) Pixels in the block projected on orthoimage are transformed into the observation image coordinate. Then, image values are interpolated at the image observation coordinate. As a result, the proposed method can be executed with similar computation load to geometric transformation without terrain correction.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kiyonari Fukue, Hiroyuki Fujisada, and Mitsuharu Tokunaga "New approach to ASTER orthoimage generation", Proc. SPIE 2817, Infrared Spaceborne Remote Sensing IV, (21 October 1996);


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