| Technology and Methodology |
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The Feasibility of Replacing Surface Temperature with Surface Radiation Temperature: A Case Study of "FY-2C" and MODIS Data |
| RONG Yuan1,2, YANG Yong-min1,2 |
1. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract In order to invert the land surface temperature data of a whole day, the authors first used data for MODIS land surface temperature and the same passing time of the two infrared channels of FY-2C satellite to obtain the regression coefficient by linear fitting of each pixel without considering atmospheric water vapor content and land surface emissivity, and then inverted the land surface radiation temperature with the spatial resolution of 5 km per hour of the day. Based on the transit time, the maximum and minimum surface temperatures appeared, which were downscaled to the spatial resolution of 1 km. Comparing the distribution of the 5 km spatial resolution land surface radiation temperature inverted from FY-2C data with the distribution of MODIS 5 km spatial resolution land surface temperature at the same time and same scale, the authors found that their spatial distributions are similar. Finally, the authors calculated the average 1 km spatial resolution surface radiation temperature inverted from FY-2C remote sensing data and MODIS 1 km spatial resolution land surface temperature in the regions with different vegetation types in combination with the vegetation cover classification map, and the results suggest that the absolute error is 1.95 K and the relative error is 10.7%, which means that the error of the land surface radiation temperature inverted by the method and the land surface temperature is below 2 K when the main body of the land surface is covered with soil and vegetation.
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| Keywords
Land surface temperature(LST)
ASTER
NDVI
Urban heat island effect
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Issue Date: 16 December 2011
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2011,
Vol. 23
