Suitability analysis and evaluation of MODTRAN night radiance mode

doi:10.7523/j.ucas.2021.0059

Abstract

Abstract: The night radiance mode of MODTRAN (moderate resolution atmospheric transmission) can simulate the lunar irradiance transfer, but the lunar-source model of MODTRAN simplifies the calculation of the lunar phase function, lunar albedo, sun-moon distances, and earth-moon distances. This simplicity can lead to some errors in the result, which affects the calibration accuracy. So, the sensitivity of MODTRAN lunar-source model to lunar model parameters is evaluated by using perturbation analysis method in this paper. The results show that the most important parameters affecting the accuracy of lunar irradiance simulation from MODTRAN are earth-moon distances, lunar phase function, and lunar albedo. This paper used lunar irradiance model MT2009 (Miller-Turner 2009) and SeaWiFS (sea-viewing wide field-of-view sensor) satellite data as benchmarks to compare and analyze lunar-source function of MODTRAN. The results showed that:1) Lunar irradiance calculated by MODTRAN were in better agreement with the values from MT2009 and SeaWiFS when wavelength was greater than 0.675μm; 2) When the absolute value of lunar phase angle was less than 30° and earth-moon distance was 390000km, the relative differences between MODTRAN and benchmarks were less than 10%; 3) When the absolute value of lunar phase angle was greater than 30° and the moon was closed to apogee, the relative differences between lunar irradiance model of MODTRAN and benchmarks were light. While lunar phase angle was between -41° and -30° or between 30° and 41° and the moon was closed to apogee, maximum relative difference was about 10%. This paper indicates that MODTRAN lunar-source model is suitable for low-light remote sensing calibration under specific conditions. More research work on MODTRAN lunar-source model will be carried out in the future.

Key words: night light remote sensing, MODTRAN, lunar irradiance model MT2009, SeaWiFS

CLC Number:

TP732

HUANG Yanyan, ZHANG Yu, QIU Shi. Suitability analysis and evaluation of MODTRAN night radiance mode[J]. Journal of University of Chinese Academy of Sciences, 2023, 40(2): 217-226.

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