基于TM影像的流域河网信息提取

针对韭园沟流域的TM影响,采用单波段阈值法、谱间关系法、归一化水体指数、HIS彩色模型4种方式进行流域河网信息提取,得出以下结论:(1)基于TM影像6波段的单波段阈值提取方法,可以获得较清晰的河网信息,主支流河网连续性较好,河流脉络明显,但是由于遥感影像上阴影的影像,单波段改变提取阈值难以把阴影与水体进行有效区分,提取效果仅能作为一个参考;(2)利用谱间关系法和IHS颜色模型提取的河网,主干道提取效果明显,大面积的水体也可以很好地表现,支流河网只能表现大致的轮廓,存在许多严重的断流现象。

Information Extraction of River Network in River Basin Based on TM Image

In the process of research, the TM effect on Jiuyuangou watershed was studied by single-band threshold method, spectral correla-tion method, normalized water index and HIS color model.The results were as follows: ① Based on TM The single-band threshold extraction method can obtain relatively clear river network information, the main tributary river network continuity was good, the river context was obvi-ous, but because of the shadow image on the remote sensing image, the single-band change extraction threshold can not distinguish shadow and water.② The use of spectral relationship between the method and IHS color model extracted from the river network, the main road extraction effect is obvious, a large area of water can also be a good performance, tributary river network only, the river can only be used as a reference, Can show a rough outline, there are many serious disconnection phenomenon.