Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects

The MODerate resolution Imaging Spectroradiometer (MODIS) and the Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) are onboard the same satellite platform NASA TERRA. Both MODIS and ASTER offer routine retrieval of land surface temperatures (LSTs), and the ASTER- and MODIS-retrieve...

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Main Authors:	Liu, Yuanbo, Noumi, Yousuke, Yamaguchi, Yasushi
Format:	Online
Language:	English
Published:	Molecular Diversity Preservation International (MDPI) 2009
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3280847/

id	pubmed-3280847
recordtype	oai_dc
spelling	pubmed-32808472012-03-07 Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects Liu, Yuanbo Noumi, Yousuke Yamaguchi, Yasushi Article The MODerate resolution Imaging Spectroradiometer (MODIS) and the Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) are onboard the same satellite platform NASA TERRA. Both MODIS and ASTER offer routine retrieval of land surface temperatures (LSTs), and the ASTER- and MODIS-retrieved LST products have been used worldwide. Because a large fraction of the earth surface consists of mountainous areas, variations in elevation, terrain slope and aspect angles can cause biases in the retrieved LSTs. However, terrain-induced effects are generally neglected in most satellite retrievals, which may generate discrepancy between ASTER and MODIS LSTs. In this paper, we reported the terrain effects on the LST discrepancy with a case examination over a relief area at the Loess Plateau of China. Results showed that the terrain-induced effects were not major, but nevertheless important for the total LST discrepancy. A large local slope did not necessarily lead to a large LST discrepancy. The angle of emitted radiance was more important than the angle of local slope in generating the LST discrepancy. Specifically, the conventional terrain correction may be unsuitable for densely vegetated areas. The distribution of ASTER-to-MODIS emissivity suggested that the terrain correction was included in the generalized split window (GSW) based approach used to rectify MODIS LSTs. Further study should include the classification-induced uncertainty in emissivity for reliable use of satellite-retrieved LSTs over relief areas. Molecular Diversity Preservation International (MDPI) 2009-02-17 /pmc/articles/PMC3280847/ /pubmed/22399955 http://dx.doi.org/10.3390/s90201054 Text en © 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Liu, Yuanbo Noumi, Yousuke Yamaguchi, Yasushi
spellingShingle	Liu, Yuanbo Noumi, Yousuke Yamaguchi, Yasushi Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects
author_facet	Liu, Yuanbo Noumi, Yousuke Yamaguchi, Yasushi
author_sort	Liu, Yuanbo
title	Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects
title_short	Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects
title_full	Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects
title_fullStr	Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects
title_full_unstemmed	Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects
title_sort	discrepancy between aster- and modis- derived land surface temperatures: terrain effects
description	The MODerate resolution Imaging Spectroradiometer (MODIS) and the Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) are onboard the same satellite platform NASA TERRA. Both MODIS and ASTER offer routine retrieval of land surface temperatures (LSTs), and the ASTER- and MODIS-retrieved LST products have been used worldwide. Because a large fraction of the earth surface consists of mountainous areas, variations in elevation, terrain slope and aspect angles can cause biases in the retrieved LSTs. However, terrain-induced effects are generally neglected in most satellite retrievals, which may generate discrepancy between ASTER and MODIS LSTs. In this paper, we reported the terrain effects on the LST discrepancy with a case examination over a relief area at the Loess Plateau of China. Results showed that the terrain-induced effects were not major, but nevertheless important for the total LST discrepancy. A large local slope did not necessarily lead to a large LST discrepancy. The angle of emitted radiance was more important than the angle of local slope in generating the LST discrepancy. Specifically, the conventional terrain correction may be unsuitable for densely vegetated areas. The distribution of ASTER-to-MODIS emissivity suggested that the terrain correction was included in the generalized split window (GSW) based approach used to rectify MODIS LSTs. Further study should include the classification-induced uncertainty in emissivity for reliable use of satellite-retrieved LSTs over relief areas.
publisher	Molecular Diversity Preservation International (MDPI)
publishDate	2009
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3280847/
_version_	1611506482103189504

Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects

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