二次改进归一化差异水体指数（SMNDWI）提取海岸线的研究

摘要

Due to the fast development of industrialization and urbanization, shoreline extraction is necessary for the sustainable development and environment protection in many countries. This study focused on the accurate methods of extracting the instantaneous waterline—shoreline obtained as the same instant as the satel ite image is acquired. Based on NDWI (Normalized Difference Water Index) and MNDWI (Modified Normalized Difference Water Index), the study changed the band combination and proposed a second modified normalized water index (SMNDWI) to extract the waterline. And, this new index is applied to three types of coast to evaluate the performance of this method with traditional ones. Results show that SNDWI is better than NDWI and suitable for applying to the waterline extraction.%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。