Journal
REMOTE SENSING
Volume 12, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/rs12071082
Keywords
ASTER; downscaling; land surface temperature; RFATPK; Sentinel-2A
Categories
Funding
- Science and Technology Planning Project of Guangdong Province [2018B020207012, 2018B020207002]
- National Natural Science Foundation of China [41901371]
- Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) [GML2019ZD0301]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06D336]
- GDAS' Project of Science and Technology Development [2018GDASCX-0101, 2019GDASYL-0302001]
- open fund of Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System [2017B030314138]
- Provincial Agricultural Science and technology innovation and promotion project of Guangdong Province [2019KJ147]
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Land surface temperature (LST) is a vital physical parameter of earth surface system. Estimating high-resolution LST precisely is essential to understand heat change processes in urban environments. Existing LST products with coarse spatial resolution retrieved from satellite-based thermal infrared imagery have limited use in the detailed study of surface energy balance, evapotranspiration, and climatic change at the urban spatial scale. Downscaling LST is a practicable approach to obtain high accuracy and high-resolution LST. In this study, a machine learning-based geostatistical downscaling method (RFATPK) is proposed for downscaling LST which integrates the advantages of random forests and area-to-point Kriging methods. The RFATPK was performed to downscale the 90 m Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) LST 10 m over two representative areas in Guangzhou, China. The 10 m multi-type independent variables derived from the Sentinel-2A imagery on 1 November 2017, were incorporated into the RFATPK, which considered the nonlinear relationship between LST and independent variables and the scale effect of the regression residual LST. The downscaled results were further compared with the results obtained from the normalized difference vegetation index (NDVI) based thermal sharpening method (TsHARP). The experimental results showed that the RFATPK produced 10 m LST with higher accuracy than the TsHARP; the TsHARP showed poor performance when downscaling LST in the built-up and water regions because NDVI is a poor indicator for impervious surfaces and water bodies; the RFATPK captured LST difference over different land coverage patterns and produced the spatial details of downscaled LST on heterogeneous regions. More accurate LST data has wide applications in meteorological, hydrological, and ecological research and urban heat island monitoring.
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