基于环境小卫星CCD影像的水体提取指数法比较  

Comparison and Research on Different Indices for Water Extraction Based on CCD Images from HJ Satellite

作　　者：范登科[1] 李明[1] 贺少帅 

机构地区：[1]武汉大学遥感信息工程学院,湖北武汉430079 [2]北京宇视蓝图信息技术有限公司,北京100096

出　　处：《地理与地理信息科学》2012年第2期14-19,共6页Geography and Geo-Information Science

基　　金：国家973重点基础研究发展计划资助项目"面向数字城市的实时跨媒体信息存储与公众服务"(2011CB302306);武汉大学博士研究生自主科研项目(20102130101000131);武汉大学博士研究生自主科研项目(201121302020002)

摘　　要：针对湖北省大东湖水网水环境遥感监测需求,开展基于环境小卫星CCD影像的内陆湖库水体提取指数方法研究。以常见的3种水体识别指数为模型,参照使用TM、MODIS等典型传感器进行水体提取的波段选择方式,通过对环境小卫星CCD影像4个波段地物光谱信息的变化趋势分析,发现各波段对水体目标的区分能力;使用指数模型和相应阈值分别计算获得水体特征图像,并以目视判读结合精度评价指标的方式对提取结果进行对比分析。实验结果表明,归一化差异综合水体指数的目视判别效果最好,且具有水陆区分度高和误识别率低的特点,适用于解决水体目标快速提取问题。Based on CCD images captured from HJ satellite,this paper presents a comparison and research on capabilities of different indices in extracting inland lakes′ water,relating to the requirement of water environmental monitoring by remote sensing technique for East Lakes in Hubei Province.Referring to optimal bands used for water extraction from typical sensors,such as TM and MODIS,images from HJ satellite were utilized as data source to analyze and assess its availability on water extraction.Radiation in reflectance from all four bands was composed to evaluate the notable variation trend.Simultaneously,three water identification indices with their corresponding threshold were investigated to retrieve feature scenes and find the best solution.Experiments show that CIWI（Combined Index of Normalized Difference Water Index） can get the best image inspection,the highest discrimination and the lowest misidentification ratio,which could cope with fast water identification issues.

关 键 词：环境小卫星 内陆湖库 水体提取指数 

分 类 号：TP750[自动化与计算机技术—检测技术与自动化装置]