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Open AccessArticle

Development of a High Resolution BRDF/Albedo Product by Fusing Airborne CASI Reflectance with MODIS Daily Reflectance in the Oasis Area of the Heihe River Basin, China

1
State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, P.O. Box 9718, Beijing 100101, China
2
Joint Center for Global Change Studies (JCGCS), Beijing 100875, China
3
College of Resources and Environment, University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China
4
College of Global Change and Earth System Science, Beijing Normal University, NO. 19 Xinjiekouwai Street, Beijing 100875, China
*
Author to whom correspondence should be addressed.
Academic Editors: Xin Li, Yuei-An Liou, Richard Müller and Prasad S. Thenkabail
Remote Sens. 2015, 7(6), 6784-6807; https://doi.org/10.3390/rs70606784
Received: 12 January 2015 / Revised: 4 May 2015 / Accepted: 13 May 2015 / Published: 28 May 2015
A land-cover-based linear BRDF (bi-directional reflectance distribution function) unmixing (LLBU) algorithm based on the kernel-driven model is proposed to combine the compact airborne spectrographic imager (CASI) reflectance with the moderate resolution imaging spectroradiometer (MODIS) daily reflectance product to derive the BRDF/albedo of the two sensors simultaneously in the foci experimental area (FEA) of the Heihe Watershed Allied Telemetry Experimental Research (HiWATER), which was carried out in the Heihe River basin, China. For each land cover type, an archetypal BRDF, which characterizes the shape of its anisotropic reflectance, is extracted by linearly unmixing from the MODIS reflectance with the assistance of a high-resolution classification map. The isotropic coefficients accounting for the differences within a class are derived from the CASI reflectance. The BRDF is finally determined by the archetypal BRDF and the corresponding isotropic coefficients. Direct comparisons of the cropland archetypal BRDF and CASI albedo with in situ measurements show good agreement. An indirect validation which compares retrieved BRDF/albedo with that of the MCD43A1 standard product issued by NASA and aggregated CASI albedo also suggests reasonable reliability. LLBU has potential to retrieve the high spatial resolution BRDF/albedo product for airborne and spaceborne sensors which have inadequate angular samplings. In addition, it can shorten the timescale for coarse spatial resolution product like MODIS. View Full-Text
Keywords: high spatial resolution BRDF/albedo product; airborne CASI; MODIS; multi-sensor; land-cover-based linear BRDF unmixing (LLBU) high spatial resolution BRDF/albedo product; airborne CASI; MODIS; multi-sensor; land-cover-based linear BRDF unmixing (LLBU)
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MDPI and ACS Style

You, D.; Wen, J.; Xiao, Q.; Liu, Q.; Liu, Q.; Tang, Y.; Dou, B.; Peng, J. Development of a High Resolution BRDF/Albedo Product by Fusing Airborne CASI Reflectance with MODIS Daily Reflectance in the Oasis Area of the Heihe River Basin, China. Remote Sens. 2015, 7, 6784-6807.

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