Determination of Angular Distribution Models for Indian desert scene: Comparison with other desert models

Shukla, Bipasha Paul; Sathiyamoorthy, V.; Pal, P. K.

doi:10.1016/j.asr.2009.02.002

Cited by 1 publication

(2 citation statements)

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“…The calibration results based on ocean and desert sites show similar distribution characteristics for ∆A and ∆B versus the view zenith angle. However, there are some deviations between the fit curves of these two calibration results, especially at view zenith angles larger than 45 • for the blue band to the yellow band (443, 490, 565), which may be introduced in the spectral interpolation of the desert data as the spectra increase quickly with the wavelength in the region of 400-600 nm, which can be found in the other articles [11][12][13]. We finally recommend following the calibration results over an SNES in visible bands.…”

Section: Site Namementioning

confidence: 96%

“…These sites have been used for POLDER in-flight multi-angle calibration by the cross-calibration method [8][9][10]. Other sensors also use this technique to perform radiometric validation [11] or to monitor sensor degradation [12]. Recently, Zhou et al [13] analyzed the moderate-resolution imaging spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF) product in desert sites and forests and established BRDF look-up tables (LUTs) for cross-calibration.…”

Section: Introductionmentioning

confidence: 99%

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The Operational Inflight Radiometric Uniform Calibration of a Directional Polarimetric Camera

Chen

Luo

et al. 2021

Remote Sensing

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The directional polarimetric camera (DPC) on-board the GF-5A satellite is designed for atmospheric or water color detection, which requires high radiometric accuracy. Therefore, in-flight calibration is a prerequisite for its inversion application. For large field optical sensors, it is very challenging to ensure the consistency of radiation detection in the whole field of view in the space environment. Our work proposes a vicarious in-flight calibration method based on sea non-equipment sites (visible bands) and land non-equipment sites (all bands). Combined with environmental parameters and radiation transmission calculations, we evaluated the radiation detection accuracy of the 0° to 60° view zenith angle of the DPC in each band. Our calibration method is based on the single-day normalized radiance data measured by the DPC. Through data selection, enough calibration samples can be obtained in a single day (the number of desert samples is more than 5000, and the number of calibration samples of the ocean is more than 2.8×106). The measurements are compared with the simulation of 6SV VRT code or look-up tables. The massive amount of data averages the uncertainty of a single-point calculation. Although the uncertainty of a single sample is significant, the final fitting of the curve of the variation in the radiometric calibration coefficient with the observation angle can still keep the root mean squared error at approximately 2–3% or even lower, and for visible bands, the calibration results for both ocean sites and desert sites are in good agreement regarding the non-uniformity of the sensor.

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Section: Site Namementioning

confidence: 96%