一种利用地形图和遥感影像提取小班界线的方法

A method to extract the subcompartment boundary from contour of the relief map supported using GIS technology

利用地形图提供的等高线生成不同空间分辨率的数字高程模型(DEM),从中选择最佳分辨率DEM提取坡向图,并在G IS支持下对坡向图进行图像处理形成矢量多边形。对于DEM无法提取的部分区域则通过遥感影像分类后再分割的方法提取。在此基础上分析了所有矢量化结果与人工地面调查的小班线,结果表明:使用10 m左右空间分辨率DEM提取小班界线较好,经图像处理后,矢量多边形与小班线的重合率可以达到70%,进一步编辑修改后可以作为小班区划的工作底图。

Drawing the subcompartment boundary is an important step in establishing the subcompartment-based forest resources inventory. It not only needs great ground work, but also is expensive and low efficient. This paper proposed a new method, the using contour of the relief map to extract the slope map. In order to use the slope map, the subcompartment boundary has to be drawn. During the extracting work, DEM and image processing were used via GIS technology. The results show that 70% of the extracted polygon lines can be superposed to the investigated subcompartment boundary.