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Open AccessArticle

Derivation of Land Surface Albedo at High Resolution by Combining HJ-1A/B Reflectance Observations with MODIS BRDF Products

by Bo Gao 1,2, Li Jia 1,3,* and Tianxing Wang 1
1
State Key Laboratory of Remote Sensing Science, The Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences, Beijing 100101, China
2
Beijing Laboratory of Water Resource Security, Capital Normal University, Beijing 100048, China
3
Alterra, Wageningen University and Research Centre, The Netherlands
*
Author to whom correspondence should be addressed.
Remote Sens. 2014, 6(9), 8966-8985; https://doi.org/10.3390/rs6098966
Received: 21 April 2014 / Revised: 17 July 2014 / Accepted: 18 July 2014 / Published: 22 September 2014
Land surface albedo is an essential parameter for monitoring global/regional climate and land surface energy balance. Although many studies have been conducted on global or regional land surface albedo using various remote sensing data over the past few decades, land surface albedo product with a high spatio–temporal resolution is currently very scarce. This paper proposes a method for deriving land surface albedo with a high spatio–temporal resolution (space: 30 m and time: 2–4 days). The proposed method works by combining the land surface reflectance data at 30 m spatial resolution obtained from the charge-coupled devices in the Huanjing-1A and -1B (HJ-1A/B) satellites with the Moderate Resolution Imaging Spectroradiometer (MODIS) land surface bidirectional reflectance distribution function (BRDF) parameters product (MCD43A1), which is at a spatial resolution of 500 m. First, the land surface BRDF parameters for HJ-1A/B land surface reflectance with a spatial–temporal resolutions of 30 m and 2–4 day are calculated on the basis of the prior knowledge from the MODIS BRDF product; then, the calculated high resolution BRDF parameters are integrated over the illuminating/viewing hemisphere to produce the white- and black-sky albedos at 30 m resolution. These results form the basis for the final land surface albedo derivation by accounting for the proportion of direct and diffuse solar radiation arriving at the ground. The albedo retrieved by this novel method is compared with MODIS land surface albedo products, as well as with ground measurements. The results show that the derived land surface albedo during the growing season of 2012 generally achieved a mean absolute accuracy of ±0.044, and a root mean square error of 0.039, confirming the effectiveness of the newly proposed method. View Full-Text
Keywords: land surface albedo; BRDF; high resolution; HJ-1A/B; MODIS land surface albedo; BRDF; high resolution; HJ-1A/B; MODIS
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Gao, B.; Jia, L.; Wang, T. Derivation of Land Surface Albedo at High Resolution by Combining HJ-1A/B Reflectance Observations with MODIS BRDF Products. Remote Sens. 2014, 6, 8966-8985.

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