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http://dx.doi.org/10.7848/ksgpc.2021.39.6.563

Evaluation on extraction of pixel-based solar zenith and offnadir angle for high spatial resolution satellite imagery  

Seong, Seon Kyeong (Dept. of Civil Engineering, Chungbuk National University)
Seo, Doo Chun (Image Data System Development Division, Satellite Information Center, Korea Aerospace Research Institute (KARI))
Choi, Jae Wan (Dept. of Civil Engineering, Chungbuk National University)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.39, no.6, 2021 , pp. 563-569 More about this Journal
Abstract
With the launch of Compact Advanced Satellite 500 series of various characteristics and the operation of KOMPSAT-3/3A, uses of high-resolution satellite images have been continuously increased. Especially, in order to provide satellite images in the form of ARD (Analysis Ready Data), various pre-processing such as geometric correction and radiometric correction have been developed. For pre-processing of high spatial satellite imagery, auxiliary information, such as solar zenith, solar azimuth and offnadir angle, should be required. However, most of the high-resolution satellite images provide the solar zenith and nadir angle for the entire image as a single variable. In this paper, the solar zenith and offnadir angle corresponding to each pixel of the image were calculated using RFM (Rational Function Model) and auxiliary information of the image, and the quality of extracted information were evaluated. In particular, for the utilization of pixel-based solar zenith and offnadir angle, pixel-based auxiliary data were applied in calculating the top of atmospheric reflectance, and comparative evaluation with a single constant-based top of atmospheric reflectance was performed. In the experiments using various satellite imagery, the pixel-based solar zenith and offnadir angle information showed a similar tendency to the auxiliary information of satellite sensor, and it was confirmed that the distortion was reduced in the calculated reflectance in the top of atmospheric reflectance.
Keywords
Auxiliary Information; Offnadir Angle; Satellite Imagery; Solar Zenith Angle;
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