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Analysis of Meticulous Features of Urban Surface Temperature based on UAV Thermal Thermography |
Tian Huihui,Feng Li,Zhao Menmen,Guo Song,Dong Jiwei |
(Department of Geographic Information Science,Hohai University,Nanjing 211100,China) |
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Abstract Taking a university campus in Jiangning District of Nanjing as the study area,we used an Unmanned Aerial Vehicle (UAV) mounted with a thermal infrared imager to map the land surface temperature of the study area for analysis of thermal variance and its change over different typical urban surface patterns.6 typical urban underlying surfaces (water,shrubs,grass,brick pavement,marble pavement and asphalt pavement) were identified in the study area.Thus,the objective of the study is to analyze the variation of the obtained land surface temperature among the surface patterns in the study area and to reveal the detailed characteristics of the LST changes under different weather conditions within a day and a month.The estimation of sensible heat release was conducted to quantitatively describe the fine characteristics of the surface temperature of different underlying surfaces.The influencing factors of surface temperature changes were investigated by correlating surface temperature with meteorological factors.The results showed that under different weather conditions,there were differences in the characteristics of surface temperature and sensible heat release on underlying surfaces.In sunny days,the diurnal variation of different underlying surfaces fluctuated greatly,the temperature of asphalt pavement was relatively high,and the sensible heat release was the largest,which had the greatest impact on the thermal environment,followed by the marble and brick pavement.The water and shrub almost had no sensible heat release during the day,and the remission effect on the thermal environment was obvious.In cloudy days,the diurnal variation of surface temperature on different underlying surfaces was not obvious and the artificial was still the main body of sensible heat release.Referring to meteorological factors,the solar radiation and the air temperature were positively correlated with the surface temperature of the underlying surface which had a warming effect on the underlying surface.The air humidity was negatively correlated with the temperature of the underlying surface,which played a role of cooling the land surface.This research will provide a new idea and method for the study of urban micro\|thermal environment and a theoretical basis for the research of urban micro-thermal environment based on remote sensing.
〖HT〗〖ST〗〖HJ〗〖WT〗〖JP〗〖LM〗
〖GK2!2〗
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Received: 28 October 2018
Published: 09 July 2019
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