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Title: Geometric evaluation and calibration of X-SAT satellite imagery
Authors: Kwoh, L.K. 
Huang, X. 
Tan, W.J. 
Keywords: Attitude
Camera calibration
Geometric accuracy
Issue Date: 2011
Citation: Kwoh, L.K.,Huang, X.,Tan, W.J. (2011). Geometric evaluation and calibration of X-SAT satellite imagery. 32nd Asian Conference on Remote Sensing 2011, ACRS 2011 1 : 687-691. ScholarBank@NUS Repository.
Abstract: X-SAT, Singapore's first locally-built micro-satellite was successfully launched on 20 April 2011. This satellite carries a multispectral camera IRIS with three spectral bands (NIR/Red/Green) at 10m resolution. The data acquired were transmitted to CRISP ground station for post processing. CRISP was also involved in the development of the ground processing system as well as post flight geometric and radiometric calibration of the sensor. This paper presents the satellite camera model developed and the processes for geometric calibration and validation of the imagery. By design, the three lines of CCDS (NIR, Red and Green) are physically separated in the focal plane and their first pixels not absolutely aligned. In this exercise, we computed the band to band separations as well as alignment of the CCDs relative to each other. In addition, we also computed the focal length of camera. The results of the band to band along-track separation agree well with the pre-flight values provided by the vendor (0.093°and 0.046°for the NIR vs red and green vs red CCDs). The band cross-track alignments were 0.05 pixel and 5.9 pixel for the NIR vs red and green vs red CCDs. The focal length was found to be shorter by about 0.8%. This was attributed to the lower operating temperature which XSAT is currently operating.
Source Title: 32nd Asian Conference on Remote Sensing 2011, ACRS 2011
ISBN: 9781618394972
Appears in Collections:Staff Publications

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