一种提取城市多种不透水层的垂直不透水层指数

发布时间：2018-01-17 02:03

本文关键词：一种提取城市多种不透水层的垂直不透水层指数　出处：《测绘学报》2017年04期 　论文类型：期刊论文

【摘要】：针对中低分辨率影像中不透水层的异质性及其与裸土光谱的易混性两类问题,选用蓝、近红外波段进行线性组合,构建了一种新的不透水层提取指数——垂直不透水层指数(PII)。该指数考虑了不透水层和其他地物在光谱空间的差异与不透水层的内部异质性,并以"不透水层线"与"土壤线"夹角的角平分线作为PII的参照线,实现了自适应的不透水层提取。本文将PII指数应用于武汉和北京不同场景中,并对比归一化建筑物指数(NDBI)、比值居民地指数(RRI)以及生物物理组份指数(BCI)的提取结果。试验表明:1在裸土较少、地形平坦的武汉市区域和裸土较多、地形起伏的北京市区域,PII指数均能有效减弱裸土的混淆影响,不透水层提取精度分别达到96.05%和96.76%,优于其他3种指数;2PII指数不仅增强了不透水层与其他地物的可区分性,还保持了不透水层类内的相似性,在城市不同场景中的不透水层提取精度均能达到90%以上。由于PII指数是一种线性组合形式的指数,能够根据研究区的地物光谱自适应调整指数的方程系数,从而能适用于不同研究区,在裸地较多的地区优势尤为明显。
[Abstract]:Aiming at the heterogeneity of impermeable layer in low and medium resolution images and its easy mixing with bare soil spectrum, blue and near infrared bands are selected for linear combination. A new extraction index of impermeable layer, perpendicular impermeable layer index, is constructed, which considers the difference between impermeable layer and other features in spectral space and the internal heterogeneity of impermeable layer. With the angle of "impermeable layer line" and "soil line" as the reference line of PII, adaptive impermeable layer extraction is realized. In this paper, the PII index is applied to different scenes in Wuhan and Beijing. The results of extraction of normalized building index (NDBI), ratio index (RRI) and biophysical component index (BCI) were compared. The experimental results showed that the ratio of 1 to 1 was less in bare soil. There are more areas and bare soils in Wuhan with flat terrain, and the PII index of Beijing area with undulating topography can effectively reduce the confusion effect of bare soil. The extraction accuracy of impermeable layer was 96.05% and 96.76, respectively, which was superior to the other three indexes. 2PII index not only enhances the distinction between impermeable layer and other features, but also maintains the similarity of impermeable layer. The extraction accuracy of impermeable layer in different city scenes can reach more than 90%. Because PII exponent is a linear combination index. The equation coefficients of the index can be adjusted adaptively according to the spectrum of the study area, so it can be applied to different research areas, especially in the regions with more bare land.
【作者单位】：中国地质大学(武汉)信息工程学院;
【基金】：国家重点研发计划(2016YFB0502603)~~
【分类号】：P237
【正文快照】： 近年来中国各城市发展迅速,相关研究也越来越多,如城市形态的时空演变、热岛效应、空气污染、污水排放等[1-2]。城市建筑物和道路路面等不透水层作为城市研究的最重要组成部分,受到众多学科的广泛关注。这两种地物类型在中低分辨率遥感影像中被抽象表达为“不透水层”。基于中

【相似文献】