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Remote Sens. 2015, 7(8), 10951-10972; doi:10.3390/rs70810951

A Method for Retrieving Daily Land Surface Albedo from Space at 30-m Resolution

1,2,3,4
,
1,2,3,4,* and 5
1
Beijing Laboratory of Water Resource Security, Capital Normal University, Beijing 100048, China
2
Base of the State Key Laboratory of Urban Environmental Process and Digital Modeling, Capital Normal University, Beijing 100048, China
3
Key Laboratory of 3D Information Acquisition and Application, Ministry of Education, Capital Normal University, Beijing 100048, China
4
College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China
5
State Key Laboratory of Remote Sensing Science, The Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Academic Editors: Jose Moreno, Dale A. Quattrochi and Prasad S. Thenkabail
Received: 21 May 2015 / Revised: 21 July 2015 / Accepted: 12 August 2015 / Published: 24 August 2015
View Full-Text   |   Download PDF [1092 KB, uploaded 24 August 2015]   |  

Abstract

Land surface albedo data with high spatio-temporal resolution are increasingly important for scientific studies addressing spatially and/or temporally small-scale phenomena, such as urban heat islands and urban land surface energy balance. Our previous study derived albedo data with 2–4-day and 30-m temporal and spatial resolution that have better spatio-temporal resolution than existing albedo data, but do not completely satisfy the requirements for monitoring high-frequency land surface changes at the small scale. Downscaling technology provides a chance to further improve the albedo data spatio-temporal resolution and accuracy. This paper introduces a method that combines downscaling technology for land surface reflectance with an empirical method of deriving land surface albedo. Firstly, downscaling daily MODIS land surface reflectance data (MOD09GA) from 500 m to 30 m on the basis of HJ-1A/B BRDF data with 2–4-day and 30-m temporal and spatial resolution is performed: this is the key step in the improved method. Subsequently, the daily 30-m land surface albedo data are derived by an empirical method combining prior knowledge of the MODIS BRDF product and the downscaled daily 30-m reflectance. Validation of albedo data obtained using the proposed method shows that the new method has both improved spatio-temporal resolution and good accuracy (a total absolute accuracy of 0.022 and a total root mean squared error at six sites of 0.028). View Full-Text
Keywords: albedo; downscaling; spatio-temporal resolution; HJ-1A/B; MODIS albedo; downscaling; spatio-temporal resolution; HJ-1A/B; MODIS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gao, B.; Gong, H.; Wang, T. A Method for Retrieving Daily Land Surface Albedo from Space at 30-m Resolution. Remote Sens. 2015, 7, 10951-10972.

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