高分六号卫星城市建成区提取方法

Extraction Method of Urban Area From GF-6 Satellite

针对基于可见光红波段和基于可见光绿波段的建成区指数方法提取的建成区易与水体和裸土区域混淆的问题,提出一种新建城区提取指数(NBAEI)方法,该方法考虑黄色波段在构建建成区提取指数的作用,利用建成区在黄色波段与红色波段的反射率差值所具有的正负特性可以完全区分建成区与水体区域,同时放大与裸地之间的差异以便提取建成区。以宝鸡市、日照市和保定市作为实验区域,分析总体精度、错分精度和漏分精度三类指标。实验结果表明,NBAEI方法总体分类精度高于其他两种方法,错分精度和漏分精度低于其他两种方法,说明所提方法的提取精度更高,效果更好,更适用于高分六号卫星提取建成区。

Since the urban extraction based on the visible light red band and the urban index method based on the visible light green band are easily confused with the water body and bare land,we propose a method to consider the yellow band of the new extraction index(NBAEI)in urban areas.The function of the extraction index is to use the positive and negative characteristics of the reflection difference between the yellow and red wavelengths in an urban area,distinguish the urban area from the water body,and widen the difference between the bare land and the urban area while extracting the urban area.Baoji city,Rizhao city,and Baoding city are used as study areas,and three types of indicators are analyzed:overall accuracy,misclassification accuracy,and omission accuracy.Experimental results show that the overall classification accuracy of the NBAEI method is higher than the other two methods.The accuracy of misclassification and omission is lower than the other two methods,indicating that the proposed method is very accurate,effective,and suitable for extraction.The urban area is extracted from the GF-6 satellite.