基于LandSATTM的厦门湾水边线提取方法初探

Preliminary Study of Waterline Extraction Methods at Xiamen Bay based on LandSAT TM

以厦门湾为研究区域，结合2008年LandSATTM遥感影像，分别对单波段阈值法、多波段谱间关系法、水体指数法以及最大似然法在水边线提取效果上进行比较，发现b3／b5方法和单波段阈值法提取水边线的效果相对较好，b3／b5方法对围梗、滩涂等非水体信息的提取能力较强，而单波段阈值法则更擅长提取一些细小的水体信息。综合利用这两种方法，并结合最大似然法建立了厦门湾水边线综合提取方法，该方法的提取精度高于单一提取方法，适用范围更广，且在处理上具有较大的灵活性，可以作为一种快速提取海岸带复杂地物水边线的参考方法。

The single-band threshold, multi-band spectral relationship, water indexes as well as the maximum likelihood classifier were investigated, taking Xiamen Bay as case study, based on the satellite image obtained from LandSAT TM in 2008. The investigated results indicated that b3/b5 method and the single-band threshold method perform better on the extraction of waterline; while b3/b5 method is better on extracting the non-water information, and single-band threshold at extracting the tiny water body information. By combining these two methods and the maximum likelihood classifier, the comprehensive waterline extraction method was established for Xiamen Bay. The study showed that the comprehensive method has higher accuracy than the single method.