Fuzhou Urban Expansion And Urban Heat Island Effect, Remote Sensing Dynamic Monitoring And Analysis

Based on Remote sensing(RS) and Geographic Information System(GIS),three images of 1989,1996 and 2000 of Fuzhou city was used to monitor land use dynamic, urban expansion and urbanization, urban heat island and impervious change.We find out the land use dynamic by classifying the three images. Then we evaluate the change according to three land use dynamic indexes. The development of economic, the growth of population, the government's planning and the geographic environment are the main reasons.Fuzhou city expand quickly and the urban area of 2000 is twice of the area of 1989. The increased area is mainly from country and paddy. Combined with the socioeconomic data, this paper investigated the urbanization, urban expansion intensity and industrial structure of study area. Furthermore, regression analysis was used to find out the driving forces to Fuzhou urbanization is capital asserts investment. Furthermore the unlock of the land policy, foreign investments and geographic condition influence the speed and direction of Fuzhou city expansion greatly.In order to find out the change of the urban heat island between different dates, the three thermal images were normalized and scaled to several grades to reduce seasonal difference. The study shows that the influence of urban heat island became more and more severe.In the course of evaluating the impervious surface of Fuzhou, the digital numbers of the TM/ETM+ images were converted to normalized exo-atmospheric reflectance, then MNF transform were applied to the normalized reflectance to find out the endmembers. Based on the spectral mixture analysis impervious indexes and the impervious surface of Fuzhou city of 1996 and 2000 were extracted for further study. Otherwise it shows that there was greatly correlation between the impervious index and normalized thermal image.