基于遥感影像的钦州地区建成区 时空扩展特征分析

SPATIAL EXPANSION ANALYSIS OF THE BUILD-UP URBAN AREA IN QINZHOU BASED ON LANDSAT TM/ETM IMAGES

关键词:  遥感影像 建成区扩展 时空演变 特征分析 钦州地区

Key words:  remote images  urban expansion  spatial-temporal evolution  feature analysis  Qinzhou

摘要:

研究基于城市空间形态扩张理论和方法，以钦州市为研究对象，选用城市形态定量分析指标如扩 张面积、扩展速率指数、扩张强度指数、形状指数、分维数、紧凑度指数等，结合RS和GIS的空间分析和 统计分析研究钦州城市建成区空间形态扩展特征。以LandsatTM/ETM+影像为数据源，提取钦州市1987～ 2010年建成区信息，经分析结果表明:2000年以前钦州市以主城区扩展为主，1987～2010年主城区已经历 缓慢扩张向快速扩张阶段;2000年之后，随着钦州港区快速扩张，主城区扩张进入快速扩张阶段;2005～ 2008年主城区与钦州港区扩张均呈现缓慢;1987～2010年间，主城区和钦州港区的建成区形态较简单，且 呈现不规则的变化趋势，在建成区面积不断扩张的前提下，该时期内建成区以外部扩张为主内部填充为 辅;钦州港区从1990～2010年面积扩张以外部范围延伸为主;目前钦州市建成区发展处于中速发展向快速 发展阶段，城市空间形态发展仍将趋于剧烈演化阶段。

Abstract:

Based on the theories and methods of urban space form's expansion， taking Qinzhou city as the research object， the extend features of the build-up area of Qinzhou city were analyzed by selecting and using the quantita- tive analysis indicators of urban form such as the statistical index of the speed of expanding， the shape， the fractal dimension， and the numerical index of compactness， combining with the statistical analysis and spatial analysis of RS and GIS. With the images of Landsat TM/ETM+，this paper extracted information of the built-up region from 1987 to 2010， the results showed that center urban extension was mainly in the main city before 2000， and the main urban region had experienced the stage from slow expansion to rapid expansion from 1987 to 2010. After 2000， Along with the Qinzhou harbor area rapid expanding， the main city also entered into rapid expansion phases. From 2005 to 2008， the main city area and Qinzhou harbor area expansion were slowly. The build-up area form of main city and Qinzhou harbor was relatively simple， and changed irregularly from 1987 to 2010. Based on the build -up area was expanding， it easily indicated that the build-up area was mainly external expansion during this pe- riod. The Qinzhou harbor expansion was mainly external extension from 1990 to 2010. At present， the development of build-up area in Qinzhou is in the stage from medium speed to rapid， the urban form will tend to more intense evolutionary stages.