Mostafa, Y., Farrag, F., Abdelhafiz, A., Abd Elwahed, A. (2012). NEW MODEL FOR ORTHORECTIFICATION OF EGYPT SAT-1 IMAGES. JES. Journal of Engineering Sciences, 40(No 2), 311-325. doi: 10.21608/jesaun.2012.112735
Yasser G. Mostafa; Farrag A. Farrag; Ahmed A. Abdelhafiz; Abdelaal M. Abd Elwahed. "NEW MODEL FOR ORTHORECTIFICATION OF EGYPT SAT-1 IMAGES". JES. Journal of Engineering Sciences, 40, No 2, 2012, 311-325. doi: 10.21608/jesaun.2012.112735
Mostafa, Y., Farrag, F., Abdelhafiz, A., Abd Elwahed, A. (2012). 'NEW MODEL FOR ORTHORECTIFICATION OF EGYPT SAT-1 IMAGES', JES. Journal of Engineering Sciences, 40(No 2), pp. 311-325. doi: 10.21608/jesaun.2012.112735
Mostafa, Y., Farrag, F., Abdelhafiz, A., Abd Elwahed, A. NEW MODEL FOR ORTHORECTIFICATION OF EGYPT SAT-1 IMAGES. JES. Journal of Engineering Sciences, 2012; 40(No 2): 311-325. doi: 10.21608/jesaun.2012.112735
NEW MODEL FOR ORTHORECTIFICATION OF EGYPT SAT-1 IMAGES
1Civil Eng. Dpt. Faculty of Engineering, Sohag University
2Civil Eng. Dpt. Faculty of Engineering, Aljouf University, KSA.
3Civil Eng. Dpt. Faculty of Engineering, Assiut University.
Abstract
Digital orthoimages are proving to be suitable for a variety of mapping, Geographic Information Systems (GIS) and environmental monitoring tasks. The quality of the extracted data from orthoimages depends mainly on the accuracy of the input data and the used mathematical models. The availability of the Egypt Sat-1 satellite images provide valuable source of remote sensing data in Egypt. Egypt Sat-1 is the first Egyptian earth observation satellite which was successfully put in orbit on 2007. The main aim of this research is to represent a rigorous sensor model approach applied to Egypt Sat-1 image for orthoimage productions. For this study an image level 1A from Egypt Sat-1 satellite captured in 2009 and a topographic map, dated 1991, at scale 1:25,000 of the region of Assiut city and the surrounding are used. Orthoimage are generated in two parallel stages. The first stage is generation of Digital Elevation Model (DEM) and the second stage is developing mathematical model for an image-to-object relationship. The results of these two stages are integrated to generate the orthoimage proposed in two steps. The first step is the determination of image coordinates (in the original image plane) corresponding to the DEM grid points. The second step is assigning a gray value for these pixels. The results of this study demonstrate the possibility to orthorectify Egypt Sat-1 images to sub-pixel accuracy. Orthoimages that were generated from Egypt Sat-1 satellite images can contribute significantly to image map production and to GIS applications.
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