A Simulation-Based Error Budget of the TES Method for the Design of the Spectral Configuration of the Micro-Bolometer-Based MISTIGRI Thermal Infrared Sensor

Abstract

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Optimizing TRISHNA TIR channels configuration for improved land surface temperature and emissivity measurements

“…2. Our results are similar to those reported for the MISTIGRI mission with spectral configurations that di↵er from the TRISHNA reference (Jacob et al, 2021). Therefore, scanning the spectral space for each of the four channel is likely to provide similar results than scanning the spectral space using separated pairs of channels.…”

“…This main dependency to atmospheric conditions, which implies that the TES sensitivity to channel positions within atmospheric windows is moderate, hints that sliding at the same time the four TRISHNA TIR channels is likely to provide similar results on TES performance as obtained in this study, as well as similar recommendations for an optimized TRISHNA spectral configuration, provided that TRISHNA channels are not located nearby the limits of the atmospheric window. This statement is also supported by the similarity between the results of the current study and those reported for the MISTIGRI mission (Jacob et al, 2021) with di↵erent spectral configurations including more than two channels.…”

“…This could reveal that the TES method has similar performance when considering 3 or 4 spectral channels. This observation is reinforced by results of previous studies that obtained similar, and sometimes even slightly better, TES performance with three-channels configurations than four-channels ones Sobrino and Jiménez-Muñoz, 2014;Jiménez-Muñoz et al, 2014;Jacob et al, 2017Jacob et al, , 2021.…”

“…We select the emissivity dataset simulated by Jacob et al (2017) with the SAIL-Thermique model (Olioso, 1995;Olioso et al, 2018), and previously used to design the spectral configuration of the MISTIGRI TIR sensor (Jacob et al, 2021). This dataset, hereafter labelled SAIL271, comprises 271 simulated emissivity spectra of vegetation canopies over soils.…”

“…Thanks to enhanced numerical capabilities, further studies evaluated the performances of the TES and SW methods for a larger number of spectral configurations (Sobrino et al, 2010;Sobrino and Jiménez-Muñoz, 2014). In order to propose a spectral configuration for the MIcro Satellite for Thermal InfraRed GRound surface Imaging (MISTIGRI) mission (Lagouarde et al, 2013), Jacob et al (2021) examined the performance of the TES method for six spectral configurations based on microbolometer detectors. For this study, they used a representative emissivity spectra dataset proposed by Jacob et al (2017) to account for the cavity e↵ect, since the latter results in an upper (respectively lower) shift in emissivities (respectively radiometric temperature) as compared to the original TES settings.…”