Abstract
In addition to human activities, this study found that topography is also an important factor affecting land surface temperature (LST). In this paper, based on Landsat 8 OLI/TIRS remote sensing images, a radiative transfer model was adopted to retrieve the LST, and a maximum likelihood method was used to remove artificial environmental interference factors, such as water bodies and built-up lands. This paper aims to analyze the influence of topographic factors, such as elevation, slope, aspect and shaded relief, on the LST of Hangzhou. By means of a statistical analysis, we obtained the quantitative relationship between these factors and constructed a multiple linear regression model of terrain factors and LST. The research revealed the following findings: (1) in the study area, elevation and slope are negatively correlated with LST, and all the factors have linear relationships with LST. (2) The relationship between aspect and LST is not significant, and high values of LST are found on the southern, southeastern and southwestern slopes; the lowest values are found on the northern slopes. (3) There is a significant linear relationship between the values of the shaded relief map and LST, and the more shadows there are, the lower the LST value will be. (4) After comprehensive analysis of the influence of the abovementioned topographic factors on the LST, it is found that shaded relief has the greatest contribution and is positively correlated with LST. The influence of shaded relief on surface thermal environment should be paid more attention in the process of surface thermal environment work. The assessment of the influence degree of shaded relief and surface thermal environment should be the premise and basis for many other studies.
Highlights
In addition to human activities, this study found that topography is an important factor affecting land surface temperature (LST)
(3) There is a significant linear relationship between the values of the shaded relief map and LST, and the more shadows there are, the lower the LST value will be. (4) After comprehensive analysis of the influence of the abovementioned topographic factors on the LST, it is found that shaded relief has the greatest contribution and is positively correlated with LST
It has been concluded that there is a negative correlation between vegetation and land surface temperature (LST)[6], and soil type is closely related to the heating and cooling process of the land surface thermal environment[7]
Summary
In addition to human activities, this study found that topography is an important factor affecting land surface temperature (LST). LST can be expressed as a function of latitude, slope, aspect, terrain shadow and t ime[17] On this basis, Sun established the optimal stepwise regression model of elevation, slope, aspect, solar incident angle, NDMI and LST18 and quantitatively analyzed the correlation between LST and topography for Mount Tai, providing a good reference for studying the spatial differentiation characteristics and formation mechanism of LST. Based on Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM), terrain factors (elevation, slope, and aspect and a shaded relief map) are extracted and superimposed with LST data, and a quantitative model is used to describe the relationship between them. With the natural surface as the research object, this paper extensively analyzes the influence of topographic factors on the LST of Hangzhou city to provide a scientific basis for ecological environment construction and finding suitable living places for human beings. The relevant research methods can be extended to the study of global change, which is of great significance for understanding the laws of nature and monitoring the surface thermal environment
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