DocumentCode :
1432366
Title :
An Enhanced Physical Method for Downscaling Thermal Infrared Radiance
Author :
Liu, Desheng ; Zhu, Xiaolin
Author_Institution :
Dept. of Geogr., Ohio State Univ., Columbus, OH, USA
Volume :
9
Issue :
4
fYear :
2012
fDate :
7/1/2012 12:00:00 AM
Firstpage :
690
Lastpage :
694
Abstract :
Thermal infrared (TIR) imagery plays a critical role in characterizing land surface processes and modeling energy balances. However, due to the low TIR radiance emitted from the Earth´s surface, TIR imagery acquired from satellite thermal sensors is often with limited spatial resolutions, which presents a serious obstacle to its applications in heterogeneous landscapes (e.g., the studies of urban heat island). In this letter, we developed a new method for downscaling TIR radiance by addressing the limitations of a previously developed physical downscaling method by Liu and Pu (2008). To validate our method, a 990-m TIR image was generated by upscaling a 90-m TIR image from the Advanced Spaceborne Thermal Emission and Reflection Radiometer and downscaled back to the 90-m resolution using the proposed method. The results show that the enhanced physical method not only greatly reduced the block effects and smooth effects found in the original physical method but also improved the downscaling accuracy over the original method.
Keywords :
atmospheric techniques; atmospheric temperature; geophysical image processing; image resolution; infrared imaging; radiometers; remote sensing; sensors; Earth surface; advanced spaceborne thermal emission; block effects; downscaling TIR radiance method; downscaling accuracy analysis; downscaling thermal infrared radiance; energy balance model; enhanced physical method; heterogeneous landscapes; land surface processes; low TIR radiance emission; physical downscaling method; reflection radiometer; satellite thermal sensors; smooth effects; spatial resolutions; thermal infrared image; urban heat island; Isothermal processes; Land surface; Land surface temperature; Remote sensing; Spatial resolution; Temperature sensors; Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER); Moderate Resolution Imaging Spectroradiometer (MODIS); downscale; thermal infrared (TIR) radiance;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
Publisher :
ieee
ISSN :
1545-598X
Type :
jour
DOI :
10.1109/LGRS.2011.2178814
Filename :
6140543
Link To Document :
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