Extraction Of Urban Impervious Surface And Its Correlation With Land Surface Temperature

With the rapid development of urbanization,Impervious Surface is becoming more and more widely researched.Changes in urban Impervious Surface can not only be used to analyze urban expansion,but also the correlation that between the urban Impervious Surface and Land Surface Temperature can be used to study the changes of the urban ecological environment.This article takes Changchun City as the study area,through using remote sensing software eCognition 8.9,remote sensing image processing software ENVI 5.2,geographic information system software ArcGIS 10.2,landscape analysis software Fragstats 4.2 and statistical analysis software SPSS 20,starting from the perspective of remote sense and geographic science,integrating the theory and method of geography and landscape ecology,using different methods of object oriented to extract the surface information of Changchun City,the most suitable method to research this article is got.Also the spatial pattern of the extracted Impervious Surface is analyzed.By using the single window algorithm to retrieve land surface temperature and analyze the change tendency of each temperature level,at last,analysing the correlation between Impervious Surface and Land Surface Temperature from three aspects:Impervious Surface ratio,Landscape Indexes and Impervious Surface area change.The results obtained provide a theoretical basis and draw an idea for researching the change of urban land cover,urban expansion and urban heat island,also providing scientific basis and decision support for the planning and development of Changchun City.The research shows that:(1)Random trees classification method has the highest accuracy,the accuracy meets the experimental requirements of this paper.Integrated four stage classification results can be seen that there is a gradually rising trend of Impervious Surface on the whole and an annual average increase of 15.26km2 in Changchun City.(2)In each administrative,landscape pattern distribution of Impervious Surface is more concentrated,on the whole landscape is more tidy,and has high degree of aggregation.(3)Between 1993 and 2014 in Changchun,it can be seen that high temperature area is increasing,low and medium temperature area is decreasing from the inversion results.(4)There is a strong correlation between Land Surface Temperature and the proportion of Impervious Surface,Landscape Indexes and Impervious Surface area change.In this analysis,There is a strong positive correlation between Land Surface Temperature and the proportion of Impervious Surface.The correlation between Land Surface Temperature and landscape pattern index,only PD and Land Surface Temperature standardization exits negative correlation,the patch boundary complexity and Land Surface Temperature standardization has no correlation,several other Landscape Index and Land Surface Temperature Standardization are positively correlated.Impervious surface area is gradually increased to formed high temperature zone,and decreased the low temperature zone to be almost disappeared.