Spatial-Temporal Pattern Change of Thermal Environment in Chongqing Based on Landsat Data
The aggravation of thermal environment poses a serious threat to urban ecological environment and human health.The radiative transfer equation and Landsat data is used to retrieve Land Surface Temperature(LST)of downtown area of Chongqing in 2001 and 2019 to study the spatiotemporal changes of the urban thermal environment in these areas.The changes of thermal landscape pattern and the driving mechanism of thermal environment in this area are analyzed based on the selected landscape indexes and driving factors.The results show that:① from 2001 to 2019,the urban thermal environment in the main city of Chongqing became terrible,and the high-temperature areas increased and expanded northward as a whole.By 2019,LST showed a distribution pattern of"high inside and low outside";② by analyzing the thermal landscape pattern,the maximum patch index in the middle temperature area increased 12 times,replacing the sub low temperature area as the dominant patch type in the study area.The number and density of patches decreased by about 62％,indicating that the thermal landscape in the main urban area of Chongqing is aggregated and has strong connectivity;③ NDVI,DEM and NDBI are the main factors affecting LST in the study area.NDVI and DEM have a negative correlation with LST,and NDBI has a positive correlation with LST.The degree of impact is NDBI＞NDVI＞DEM.
万方数据
维普
