摘要
针对已有基于不透水面提取城市建成区的方法无法保证建成区连续性的问题,提出了一种基于对象不透水面聚集密度的城市建成区提取方法。该方法计算了不透水面聚集密度并进行分级,提取聚集程度高的区域为输入对象,并将被建成区完全包围的绿地水体也包含在内;利用长时序遥感影像建成区提取结果,使用城市空间形态扩展指标对济南市1997—2017年城市时空演化特征进行分析。结果表明,该方法提取精度达到93.5%,能准确刻画出城市形态,保持建成区的完整性;1997—2017年间,济南市建成区面积不断扩张,扩张速度与强度分别达到10.48 km^2/a、0.32%,呈现带状轴向扩展模式;1997—2013年,建成区扩展的不规则程度在逐年减少,2013年以后建成区形状变得复杂。
Aiming at the problem that the existing method for extracting urban built-up area based on impervious surface cannot guarantee the continuity of the built-up area,a method for extracting urban built-up area based on the aggregation density of object impervious surface is proposed.This method calculates and classifies the density of impervious surfaces,extracts the areas with a high degree of aggregation as the input object,and also includes the green land water body completely surrounded by the built-up area;based on the extraction results of long-time remote sensing images,the urban spatial and temporal evolution characteristics of Jinan city from 1997 to 2017 are analyzed by using the spatial form expansion index.The results show that:the method proposed in this paper has the extraction accuracy of 93.5%,which can accurately describe the urban form and maintain the integrity of the built-up area;from 1997 to 2017,the area of the built-up area in Jinan city continued to expand,where the speed and the intensity reached 10.48 km^2/a and 0.32%,respectively,showing a band-shaped axial expansion pattern;the irregularity of the expansion of the built-up area decreased from 1997 to 2013,and the shape of the built-up area became complicated after 2013.
作者
孟飞
殷成龙
孟祥金
肖庆锋
MENG Fei;YIN Chenglong;MENG Xiangjin;XIAO Qingfeng(School of Surveying and Geo-informatics,Shandong Jianzhu University,Jinan 250101,China)
出处
《遥感信息》
CSCD
北大核心
2020年第4期8-15,共8页
Remote Sensing Information
基金
山东省自然科学基金项目(ZR2018MD008)
国家自然科学基金项目(41271413、41801308)。
关键词
不透水面聚集密度
建成区提取
城市扩张
时空演化
济南
aggregation density of impervious surface
built-up area extraction
urban sprawl
time and spatial evolution
Jinan city
