基于RS和GIS技术的重庆市主城区扩展分析

Analysis of Urban Expansion Based on RS and GIS——A Case Study of Chongqing City

采用重庆市主城区2000年和2010年两个时相的TM影像提取城市扩展信息,对影像数据的归一化建筑指数(NDBI)、归一化植被指数(NDVI)和归一化水体指数(NDWI)进行RGB组合增强,再进行决策树分类和减法运算获取研究区扩展信息,发现建筑区面积增加了1.62倍,大部分是由植被区转变而来。其扩张方向受地理影响,南北方向为外延型,东西方向为飞地型。借助统计资料进行精度验证和城市扩展的驱动因素分析发现,区域发展政策、经济增长和人口扩张是主要的影响因素,探讨了对经济增长、城市扩张和人口增长的关系。研究结果表明,以遥感手段监测与研究城市发展变化的趋势是可行和高效的。

In this paper, TM images obtained in 2000 and 2010 of the main city of Chongcling City were transformed and processed to extract in- formation on city expmrsion,and made normalized difference building index （NDBI）,normalized difference vegetation index （NDVI） and normalized difference water index （NDWI） for RGB combination enhancement. Then the decision tree classification and subtraction were made to acquire expan- sion information of the study area. The results showed that the construction area was increased by 1.62 times, which most came from vegetation. The expansion direction was influenced by geography,and the north- south direction for extension,and the east- west direction for enclave. With the aid of statistical data, accuracy validation and city growth driving factor analysis was carried on, and it found that the regional development policy and eco- nomic growth and pop^ation expansion were the main influence factors, the economic growth and city expansion and population growth was discussed. The results showed that it was feasible and ett%ient to use the mean of remote sensing to monitor and study of city development tendency.