Estimation of Land Surface Temperature over the Tibetan Plateau Using AVHRR and MODIS Data |
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| Authors: | ZHONG Lei MA Yaoming Zhongbo SU and Mhd Suhyb SALAMA |
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| Institution: | Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede 7514 AE, Netherlands, Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610071,Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000,Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede 7514AE, Netherlands,Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede 7514AE, Netherlands |
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| Abstract: | Estimation of large-scale land surface temperature from satellite images is of great
importance for the study of climate change. This is especially true for the most challenging
areas, such as the Tibetan Plateau (TP). In this paper, two split window algorithms (SWAs),
one for the NOAA's Advanced Very High Resolution Radiometer (AVHRR), and the other for the
Moderate Resolution Imaging Spectroradiometer (MODIS), were applied to retrieve land surface
temperature (LST) over the TP simultaneously. AVHRR and MODIS data from 17 January, 14 April,
23 July, and 16 October 2003 were selected as the cases for winter, spring, summer, and
autumn, respectively. Firstly, two key parameters (emissivity and water vapor content) were
calculated at the pixel scale. Then, the derived LST was compared with in situ measurements
from the Coordinated Enhanced Observing Period (CEOP) Asia-Australia Monsoon Project (CAMP)
on the TP (CAMP/Tibet) area. They were in good accordance with each other, with an average
percentage error (PE) of 10.5% for AVHRR data and 8.3% for MODIS data, meaning the
adopted SWAs were applicable in the TP area. The derived LST also showed a wide range and
a clear seasonal difference. The results from AVHRR were also in agreement with MODIS, with
the latter usually displaying a higher level of accuracy. |
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| Keywords: | land surface temperature AVHRR MODIS Tibetan Plateau |
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