Development of BRDF Absolute Measuring Device

Jun-lin, 李俊麟 Li; Liming, 张黎明 Zhang; Hongyao, 陈洪耀 Chen; Xiaolong, 司孝龙 Si; Jixiang, 王戟翔 Wang; Baoyun, 杨宝云 Yang; Zhengguo, 沈政国 Shen

doi:10.3788/aos201434.0528002

Cited by 7 publications

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“…法进行实际测量并且得到不同的模型参数来完成对沙土表面双向反射特性的描述。实验中的波长范围为 350~1100 nm，因此不能得到其他短波及近红外波段与沙土含水量之间的关系。在以后的扩展研究中将以短波及近红外波段为主，分析是否能够更准确的反演沙土的含水量。同时，在未来的研究过程中，应该考虑粗糙地表 [16][17]…”

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Study on Inverting Soil Moisture Content Based on the Field Bidirectional Reflectance Information with the Reflection Model

Yunfeng¹,

Zhongqiu²,

Yunsheng³

2015

光学学报

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In order to invert the soil moisture content and analyze the influence of soil moisture content on the bidirectional reflectance, the parameters of bidirectional reflectance model are obtained based on the multi-angle hyper spectral data in the field, and the soil moisture content using the calculated values is inverted. The relationship between model parameters in three wavelengths and different directions and moisture content is analized, the differences of inverting soil moisture content results based on model in different directions are found, and the inverting accuracy is stablest at 865 nm. The result suggests that based on the bidirectional reflectance distribution characteristics, the soil moisture content can be inverted with high accuracy. At the same time, the effect of the directional reflectance on the inversion accuracy should also be considered.

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Study on Inverting Soil Moisture Content Based on the Field Bidirectional Reflectance Information with the Reflection Model

Yunfeng¹,

Zhongqiu²,

Yunsheng³

2015

光学学报

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Design and Verification of Ratioing Radiometer Parameters

Zou

Meng

et al. 2017

Springer Proceedings in Physics

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A method for monitoring solar diffuser’s bidirectional reflectance distribution function degradation in geostationary orbit

Wang

Zhang

et al. 2020

European Journal of Remote Sensing

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The advanced geosynchronous radiation imager (AGRI) is a geostationary sensor whose reflective solar band is calibrated by a solar diffuser (SD). The SD bidirectional reflectance distribution function (BRDF) degrades over time in the space environment. This degradation can be measured through the SD reflectance degradation monitor (SDRDM). The SDRDM calibration data are normally collected by three filtered detectors, covering wavelengths from 0.45μm to 0.90μm. The SD reflectance degradation can be derived by trending the ratio of the background-subtracted solar-angle corrected SDRDM sun and SD view responses. The conventional monitoring methods rely on geometry factors of the sun view port and the relative BRDF of the SD, and these parameters can cause uncertainties. Aiming at these uncertain factors, the present study collects calibration data at the same solar angle. This method compares the detector digital counts obtained at different times but with the same solar angle. Consequently, it cancels out the angle-dependent parameter to obtain the ratio of the BRDF degradation factors. The obtained results show that monitoring uncertainty of the proposed method is less than 0.18%, while the corresponding monitoring error is less than 0.66%. This method can be applicated in SD's BRDF monitoring.

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Development of BRDF Absolute Measuring Device

Cited by 7 publications

References 0 publications

Study on Inverting Soil Moisture Content Based on the Field Bidirectional Reflectance Information with the Reflection Model

Study on Inverting Soil Moisture Content Based on the Field Bidirectional Reflectance Information with the Reflection Model

Design and Verification of Ratioing Radiometer Parameters

A method for monitoring solar diffuser’s bidirectional reflectance distribution function degradation in geostationary orbit

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