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- Title
A Method for Retrieving Daily Land Surface Albedo from Space at 30-m Resolution.
- Authors
Bo Gao; Huili Gong; Tianxing Wang
- 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).
- Subjects
ALBEDO; DOWNSCALING (Climatology); SPATIO-temporal variation; LAND surface temperature; MODIS (Spectroradiometer)
- Publication
Remote Sensing, 2015, Vol 7, Issue 8, p10951
- ISSN
2072-4292
- Publication type
Article
- DOI
10.3390/rs70810951