The paper takes the case of Dongping Lake Landsat TM image. According to the correlation of image bands and image gray differences of objects, the water is extracted by the single - band and multi - band threshold method respectively. On this basis, the paper proposes a comprehensive water extraction method through the threshold setting by (TM2 + TM3) - (TM4 + TM5) and TM5single - band, and evaluates the result accuracy of these methods for water extraction. The results show that this synthesis method has better ability to extract the water, which greatly improves the accuracy of original single method on water extraction.%文章以东平湖LANDSAT TM影像为例,根据影像各波段间的相关性以及地物在影像上的灰度差异,分别采用单波段和多波段阈值法对影像上的水体进行提取.在此基础上,结合(TM2 +TM3)-(TM4 +TM5)设定阈值和TM5单波段阈值法,提出了一种综合水体提取的方法,最后,对各方法提取的结果进行精度评价.试验结果表明:综合提取法在该研究区域具有较好的水体提取效果,极大地改善了原始单一方法的水体提取精度.
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