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由于快速的城镇化发展和工业化发展,对许多国家来说,海岸线的提取对于可持续发展和环境保护尤为必要。本文集中研究如何准确的在卫星图片上获取的海岸线—即瞬时水边线。基于归一化差异水体指数NDWI和二次改进的归一化差异水体指数MNDWI,本研究改变了波段组合并提出了二次改进的归一化水体差异指数SMNDWI。通过把新的指数SMNDWI和传统的水体指数应用到三种不同的海岸类型,来比较分析在不同的海岸类型下SMNDWI和传统水体指数的效果。结果显示SMNDWI适用于水边线的提取且分离水体和背景效果比传统水体指数要好。
Due to rapid urbanization and industrialization, the extraction of coastlines is particularly necessary for many countries for sustainable development and environmental protection. This article focuses on how to accurately capture the coastline on satellite imagery - the momentary waterline. Based on the normalized difference water index NDWI and the secondly improved normalized difference water index MNDWI, this study changed the band combination and proposed the second-order normalized difference index SMNDWI. The effects of SMNDWI and traditional water body indices on different coastal types are compared and analyzed by applying the new index SMNDWI and the traditional water body index to three different types of coast. The results show that SMNDWI is suitable for waterfront extraction and separation of water and background effects better than the traditional water body index.