Terrain radiometric calibration of airborne UAVSAR for forested area |
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| Authors: | Xiaoguang CHENG Naiara PINTO Jianya GONG |
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| Institution: | 1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University , 129 Luoyu Road, Wuhan , 430079 , China;2. Department of Geographical Sciences , University of Maryland , College Park , MD , 20770 , USA xcheng@umd.edu;4. Department of Geographical Sciences , University of Maryland , College Park , MD , 20770 , USA;5. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University , 129 Luoyu Road, Wuhan , 430079 , China |
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| Abstract: | In the field of biomass estimation, terrain radiometric calibration of airborne polarimetric SAR data for forested areas is an urgent problem. Illuminated area correction of σ -naught could not completely remove terrain features. Inspired by Small and Shimada, this paper tested gamma-naught on one mountainous forested area using airborne Uninhabited Aerial Vehicle Synthetic Aperture Radar data and found it could remove most terrain features. However, a systematic increasing trend from far range to near range is found in airborne SAR cases. This paper made an attempt to use the relationship between distance to SAR sensor and γ-naught to calibrate γ -naught. Two quantitative evaluation methods are proposed. Experimental results demonstrate that variation of γ -naught can be constrained to a limited extent from near range to far range. Since this method is based on ground range images, it avoids complicated orthorectification. |
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| Keywords: | terrain radiometric calibration UAVSAR sigma-naught γ-naught |
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