Analysis of the Temporal Evolution of Built-Up Area Expansion in Chengdu Based on Night Light Remote Sensing
[Purposes]This paper explores the expansion changes and development trends of built-up ar-eas in Chengdu from 2007 to 2017.[Methods]Taking Chengdu as the study area,based on the nighttime light data,the support vector machine method was used to extract the built-up areas of Chengdu in 2007,2012 and 2017,and the expansion evolution trend of the built-up areas of Chengdu in the past 10 years was discussed by combining the urban expansion intensity,expansion speed and center of gravity.[Find-ings]The results show that:① From 2007 to 2012,the built-up area of Chengdu expanded by 106.87 km2,and from 2012 to 2017,the built-up area of Chengdu expanded by 370.08 km2,doubling the built-up area in 10 years.The trend of expansion is obvious,and the city is developing rapidly.② From 2007 to 2017,the built-up area of Chengdu mainly expanded to the surrounding areas with Chenghua,Qingyang and Wuhou as the center,and the coherence and area of the built-up areas of each district and county in-creased,and the center of gravity of urban development gradually shifted to the southeast,showing the characteristics of"central agglomeration and circular outward expansion".[Conclusions]The research results can provide a reference for the urban construction and development of Chengdu.
Chengdu Citynight lighting dataurban sprawlshift in center of gravity
NETL
NSTL
万方数据
