Study On Land Cover Change And Driving Factors In Guangzhou In Recent 15 Years

In recent years,with the continuous development of urbanization in our country,the change of land use types in the city and its surrounding suburbs is changing rapidly.As one of the three largest cities in Guangzhou,the geographical position is superior and the city is developing rapidly.In order to explore the impact of Guangzhou urbanization process and the development process of economic and social development of the urban construction land expansion and function,this paper makes full use of the comprehensive index of remote sensing research in Guangzhou City,including four Landsat TM remote sensing data 2001,2005,2009,2015,make full use of the remote sensing comprehensive index method,extraction and analysis the four land cover type(LUCC)of Guangzhou city,carried out a detailed analysis of time and space in two aspects,including the time strength characteristics,dynamic characteristics and regional differences and spatial characteristics,including quadrant analysis and spatial expansion of Fang wei.To reveal the situation of LUCC and urban expansion in the past 15 years in Guangzhou,and to provide scientific basis for decision-making and planning.The main conclusions are as follows:(1)By using the comprehensive index method and the maximum likelihood supervised classification method,the urban construction land data with high precision can be extracted,which is more accurate than that of using the normalized difference vegetation index(NDBI).(2)During the past 15 years,there has been a marked change in the LUCC of Guangzhou,a total reduction of km2 in the period of 155.12 years(),accounting for about 7% of the total area of the city.(3)In the past 15 years,the intensity of construction land expansion of Guangzhou is large,and the elasticity index of expansion is high.In the period of 2009~2015,the largest area of urban expansion is km2,with an extension of strength of up to 1.114%.(4)There are obvious differences in the expansion of urban areas in Guangzhou.The gravity of the construction land in Luogang District is constantly shifting towards the northeast,which shows the trend of migration from central Tianhe District to Guangzhou.(5)The intensity of urban expansion presents a weak strong weak trend with t he increase of buffer distance.And with the passage of time,the expansion of construction land to reach the peak of the distance is more and more large,it can be seen that the city center of the construction area saturation,the expansion of construction land expansion trend.