The Study On Spatial-Temporal Characteristic Of Land Use Change Based On Landsat TM/OLI Images In Hangzhou

To promote the coordinated development of land use change and social economy in Hangzhou,and to guide its appropriate expansion,rational distribution and intensive utility.The paper uses the GIS spatial analysis technology and the theory of landscape ecology and land use change,to analyze the characteristics and reasons of land use change,based on the data of the interpretation of remote sensing images and other socioeconomic indicators of Hangzhou city,and predicts the future trend of land use change in 2020 and 2025.The following conclusions are drawn:(1)The main characteristics of land use change in Hangzhou in 1995-2015 years are as follows:(1)The main types of land use are construction land and cultivated land.The area of different land use types have varying degrees,the area of construction land,urban green land and woodland are increased,and the area of cultivated land and wetland are reduced in varying degrees,and the area of water body is basically unchanged.and the area of water body is basically unchanged;It is expected that in 2025,the construction land,urban green land and woodland all have a growing trend,the rise of the woodland is small,and the proportion of the arable land and the wetland is declining,and the proportion of the water is basically unchanged,forest land will increase slightly,and farmland and wetland will decline.The proportion of water will remain unchanged.(2)The variation characteristics of different land types are obvious.The dynamic degree of different land types is: urban green land > construction land > cultivated land > woodland > wetland >water.(3)The spatial differentiation of land use change in Hangzhou is obvious.According to the comparison of the frequency of land use change,In the past 20 years,the frequency of land use change in Hangzhou was in the following order:Jianggan District > Binjiang District > Xihu District > Gongshu District > Yuhang District > Xiacheng District> Xiaoshan District > Shangcheng District.(4)The land use pattern is characterized by "complex,simple and complex",the land use degree is increasing,the patch combination tends to be balanced,the land use pattern is increasingly stable,and the distribution of land use pattern is gradually dispersed.(5)In the 2000-2015 years,the high intensity area of land use is mainly based on the axis extension,while with the form of inter axle filling.The intensity of urban land use growth is spreading outward and moving eastward,which forms the trend of cross-River spreading.The high intensity area of land use changed from the single center of old town in 2000 to the multi center and multi group form in 2015.