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A Novel Approach to Relative Radiometric Calibration on Spatial and Temporal Variations for FORMOSAT-5 RSI Imagery

Faculty of Center for Space and Remote Sensing Research, National Central University, Taoyuan 32001, Taiwan
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Author to whom correspondence should be addressed.
Sensors 2018, 18(7), 1996; https://doi.org/10.3390/s18071996
Received: 27 April 2018 / Revised: 18 June 2018 / Accepted: 19 June 2018 / Published: 21 June 2018
(This article belongs to the Section Remote Sensors, Control, and Telemetry)
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Abstract

Radiometric calibration for imaging sensors is a crucial procedure to ensure imagery quality. One of the challenges in relative radiometric calibration is to correct detector-level artifacts due to the fluctuation in discrepant responses (spatial) and electronic instability (temporal). In this paper, the integration of the empirical mode decomposition (EMD) with Hilbert–Huang transform (HHT) in relative radiometric calibration was explored for a new sensor, FS-5 RSI (remote sensing instrument onboard the FORMOSAT-5 satellite). The key intrinsic mode functions (IMFs) analyzed by HHT were examined with the pre-flight datasets of the FS-5 RSI in temporal and spatial variations. The results show that the EMD–HHT method can stabilize and improve the radiometric quality of the FS-5 imagery as well as boost its application ability to a new level. It is noticed that the IMFs of the spatial variation would be disturbed by the instability of the temporal variation. The relative response discrepancies among detector chips can be well calibrated after considering the temporal effect. Taking a test imagery dataset of gain setting G2 as an example, the standard deviation (STD) of the discrepancy in the digital number after calibration was dramatically scaled down compared to the original ones (e.g., PAN: 66.31 to 1.85; B1: 54.19 to 1.90; B2: 36.50 to 1.49; B3: 32.43 to 1.56; B4: 37.67 to 1.20). The good performance of pre-flight imagery indicates that the EMD–HHT approach could be highly practical to the on-orbit relative radiometric calibration of the FS-5 RSI sensor and is applicable to other optical sensors. To our knowledge, the proposed EMD–HHT approach is used for the first time to explore relative radiometric calibration for optical sensors. View Full-Text
Keywords: relative radiometric calibration; empirical mode decomposition; FORMOSAT-5 RSI; Hilbert–Huang transform; intrinsic mode functions (IMFs); spatial and temporal variations; relative response coefficient relative radiometric calibration; empirical mode decomposition; FORMOSAT-5 RSI; Hilbert–Huang transform; intrinsic mode functions (IMFs); spatial and temporal variations; relative response coefficient
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lin, T.-H.; Hsiao, M.-C.; Chan, H.-P.; Tsai, F. A Novel Approach to Relative Radiometric Calibration on Spatial and Temporal Variations for FORMOSAT-5 RSI Imagery. Sensors 2018, 18, 1996.

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