Navigation and Fine Co-Location of ATSR Images DONGSEOK SHIN and JOHN K. POLLARD Electronic and Electrical Engineering Department University College London

다국어 초록 (Multilingual Abstract)

In this paper, we propose a comprehensive geometric correction algorithm of Along Track Scanning Radiometer(ATSR) images. The procedure consists of two cascaded modules; pre-correction and fine co-location. The pre-correction algorithm is based on the navigation model which was derived in mathematical forms. This model was applied for correcting raw (un-geolocated) ATSR images. The non-systematic geometric errors are also introduced as the limitation of the geometric correction by this analytical method. A fast and automatic algorithm is also presented in this paper for co-locating nadir and forward views of the ATSR images by using a binary cross-correlation matching technique. It removes small non-systematic errors which cannot be corrected by the analytic method. The proposed algorithm does not require any auxiliary information, or a priori knowledge. Single channel thermal IR data (11㎛) are used for this algorithm giving faster processing and avoiding the imperfect co-registration problem observed with multiple channels. Coastlines in images are detected by a region segmentation and an automatic thresholding technique. The matching procedure is carried out with binary coastline images (nadir and forward), and it gives comparable accuracy and faster processing than a patch based matching technique. This technique automatically reduces non-systematic errors between two views to ±1 pixel.