基于DEM的江苏省平原/丘陵分区与制图

The Division and Mapping of Plain/Hill Based on DEM in Jiangsu Province

在平原微丘区,丘陵、平原界限的确定是地貌图制作的难点。本文首先指出,地貌的多样性和地区差异性决定了地貌分类的量化指标差异性,通过对比实验,制定一套合理、有效的丘陵、平原量化分类标准。在此基础上,以江苏省1:50000比例尺25m分辨率DEM为基本数据源,对全省平原、丘陵进行了划分。通过自动制图综合,完成了江苏省地貌类型图制作。实验结果显示,所提出的分类指标简单、实用,该方法大大提高了丘陵岗地划分效率与精度。

The definition of the margin between plain and hill remains a difficult problem in the process of mapping in plain and micro hill regions. This paper proposes that both the diversity in geomorphology and discrepancy in different test areas determine the difference of quantitative indices in terrain classification. The paper proposes a reasonable and effective classification method in terrain classification based on DEM through compared experiments. Using 1：50 000 scale DEM data with 25m resolution as data source, the plain and hill regions in the whole Jiangsu Province was divided, the production of geomorphology map through automatic cartographic generalization. The result shows that the series of quantitative indices are simple and practical. This classification method can gready improve the accuracy and efficiency of the division and mapping between plain and hill.