郑州市主城区空间形态信息提取与特征分析

Extraction and feature analysis of urban spatial pattern in downtown of Zhengzhou city

针对不同数据源所提取的城市空间形态特征的差异,该文以郑州市主城区为研究对象,基于2000—2018年全球“类NPP-VIIRS”夜间灯光遥感数据,运用参考比较法,剖析郑州建成区扩展的时空变化特征,并进一步结合全球城市边界(GUB)数据开展对比分析研究。结果表明,“类NPP-VIIRS”数据提取的建成区及“GUB”数据均可反映郑州市主城区发展趋势,前者主要反映城市的经济发达程度,后者主要反映土地开发建设情况。2000—2018年,郑州市建成区及“GUB”重心主要向东南方向转移,面积均逐年增加,但各年“GUB”范围均大于“类NPP-VIIRS”数据提取的建成区范围。郑州城市形态的离散程度持续增加,“GUB”所反映的城市空间形态更易受外界干扰。建成区城市边界形状日益复杂,而“GUB”边界形态不规则程度无明显变化。

To analyze the different characteristics of urban spatial morphology with various datasets,this paper shows the application of reference comparison method for built-up area information extraction in downtown of Zhengzhou city,based on the global“NPP-VIIRS-like”night light data from 2000 to 2018.Then,combined with the global urban boundary(GUB)data set,the different results of urban spatial form were compared.The results showed that both global“NPP-VIIRS-like”night light data and GUB data can reflect the trend of the city expending,the former reflects the degree of economic development of cities,and the latter reflects the land development and utilization status.From 2000 to 2018,the main direction of urban center transition is accordant,and the movements of the urban gravity centers show to southeast.The area and dispersion degree of urban spatial morphology have been both increasing,but the urban dimensions of GUB data was larger than that of global“NPP-VIIRS-like”night light data.And the urban spatial morphology of GUB data was susceptible to interference.The urban space shape was complex with the increase of fractal dimension.But the fractal dimension calculated from the GUB data set tends to be stable.