Analysis of Extracting Prior BRDF from MODIS BRDF Data

Analysis of Extracting Prior BRDF from MODIS BRDF Data
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MODIS BRDF数据提取先验BRDF分析

DOI:
10.3390/rs8121004
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发表时间:
2016-12
期刊:
影响因子:
5
通讯作者:
Cui Tiejun
Cui Tiejun
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang Hu;Jiao Ziti;Dong Yadong;Du Peng;Li Yang;Lian Yi;Cui Tiejun

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许多先前的研究试图提取先验反射率各向异性知识的历史MODIS双向反射分布函数(BRDF)产品的基础上土地覆盖或归一化差异植被指数(NDVI)数据。在这项研究中,该方法的可行性进行了讨论的基础上,MODIS数据和原型BRDFs。BRDF被简化为六个典型的BRDF,代表不同的反射率各向异性。根据各向异性平坦指数(AFX),将三个瓦片上的五年时间序列的MODIS BRDF数据分为六个BRDF原型类。确定了各BRDF原型类在不同土地覆被类或每0.1-NDVI间隔中的百分比。将不同原型BRDF和相同多角度观测数据模拟的最低BRDF调整反射率(NBARs)和NDVI与MODIS结果进行比较,以研究该方法的有效性。结果表明,一个土地覆盖类型,或每0.1-NDVI间隔,包含所有潜在的BRDF形状和一个BRDF原型类不超过40%的所有数据。此外,从不同的原型BRDF模拟的NBAR和NDVI之间的差异是微不足道的。根据原型BRDF方法和MODIS BRDF产品,本研究表明,土地覆盖或NDVI与地表反射率各向异性不一定相关。
Many previous studies have attempted to extract prior reflectance anisotropy knowledge from the historical MODIS Bidirectional Reflectance Distribution Function (BRDF) product based on land cover or Normalized Difference Vegetation Index (NDVI) data. In this study, the feasibility of the method is discussed based on MODIS data and archetypal BRDFs. The BRDF is simplified into six archetypal BRDFs that represent different reflectance anisotropies. Five-year time series of MODIS BRDF data over three tiles are classified into six BRDF archetype classes according to the Anisotropy Flat indeX (AFX). The percentage of each BRDF archetype class in different land cover classes or every 0.1-NDVI interval is determined. Nadir BRDF-Adjusted Reflectances (NBARs) and NDVIs simulated from different archetypal BRDFs and the same multi-angular observations are compared to MODIS results to study the effectiveness of the method. The results show that one land cover type, or every 0.1-NDVI interval, contains all the potential BRDF shapes and that one BRDF archetypal class makes up no more than 40% of all data. Moreover, the differences between the NBARs and NDVIs simulated from different archetypal BRDFs are insignificant. In terms of the archetypal BRDF method and MODIS BRDF product, this study indicates that the land cover or NDVI is not necessarily related to surface reflectance anisotropy.
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