Absolute radiometric calibration and time-series analysis using Sentinel-1A

Yi-Chen Chou; Tien-Hao Liao; Meng-Che Wu; Yu-Lin Tsai

doi:10.1117/12.3047730

10 January 2025 Absolute radiometric calibration and time-series analysis using Sentinel-1A

Yi-Chen Chou, Tien-Hao Liao, Meng-Che Wu, Yu-Lin Tsai

Author Affiliations +

Proceedings Volume 13267, Earth Observing Missions and Sensors: Development, Implementation, and Characterization VI; 1326711 (2025) https://doi.org/10.1117/12.3047730
Event: Asia-Pacific Remote Sensing, 2024, Kaohsiung, Taiwan

Conference Poster

Abstract

Absolute radiometric calibration is crucial in remote sensing, ensuring that raw satellite data, like that from Sentinel-1A, are accurately converted into physical units representing Earth’s surface. Sentinel-1A, part of the ESA’s Copernicus program, is equipped with a Synthetic Aperture Radar (SAR) Sensor that captures high-resolution images in all weather conditions. SAR’s ability to penetrate clouds makes it invaluable for long-term monitoring and time-series analysis. Accurate time-series analysis requires consistent radiometric values across images to detect real changes, such as deforestation or urban expansion. Calibration converts radar backscatter values to normalized radar cross-sections, adjusting for sensor and atmospheric biases. This study applies time-series backscatters from Sentinel-1A to assess the stability of the calibration process over Rosamond, California, using data from 2 corner reflectors and 17 images. The findings will support radiometric calibration for Taiwan’s future SAR mission.

(2025) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Yi-Chen Chou, Tien-Hao Liao, Meng-Che Wu, and Yu-Lin Tsai "Absolute radiometric calibration and time-series analysis using Sentinel-1A", Proc. SPIE 13267, Earth Observing Missions and Sensors: Development, Implementation, and Characterization VI, 1326711 (10 January 2025); https://doi.org/10.1117/12.3047730

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