基于DEM的低阶地提取新方法

以相对易于提取的低阶地为研究对象, 提出了一种基于DEM的简便实用的低阶地提取方法。 以构建泰森多边形的方法生成拔河高度数据, 同时结合低阶地发育特征及低阶地分布区拔河高度频度统计, 提出低阶地拔河高度统计图中低阶地识别的客观标志, 从而形成了一套较为系统、 科学的基于DEM的低阶地提取分级方法, 为阶地的定量研究开拓了新思路。 在桑干河王家湾宽谷段进行实验, 结果表明低阶地提取结果与实际吻合较好, 该方法可以应用于阶地野外实测前的室内解译, 使野外调查工作更具有针对性。

A New Extraction Method of Low-level Terraces based on DEM

Low-level terraces are relatively easily to extract. We proposed an easier and more useful extraction method. Firstly, the data of the height of terraces are generated with building Thiessen polygon method, and then combining with analysis of their developmental and statistical characteristics of the height of terraces in the distribution area of low-level terrace, this study presented an objective identification in the summary graph of the height of low-level terraces, forming a more systematic and scientific method of extraction and classification of the low-level terraces based on DEM, and provided a new idea for terraces’quantitative research. The study conducted experiment on Wangjiawan gully in the Sanggan River, which showed that the low-level terraces’extraction results based on above-mentioned method is in good agreement with the actual, and therefore the method can be applied to the terraces' indoor interpretation before field survey, and make the field survey work more targeted.