国家基本地理单元数据集的初步研究

基本地理单元是地理环境条件基本一致的空间单元,其内部要素分布的一致性显著,与相邻单元地理特征存在明显的差异。基本地理单元数据是建立在地理信息系统数据和技术基础上的专题数据。本论文就基本地理单元中的地形单元格网统计、地形类型的分类分级指标等问题进行了一系列的探讨和实验,提出了国家级中小比例尺基本地形单元数据集编制的主要技术方法和指标。

Preliminary study on specification of basic terrain-unit dataset

This paper discussed the criteria for selecting the terrain-unit, that portion of land surface, which contains a set of ground features same in the unit and different from the adjacent units. In the definition a feasible terrain-unit and leading to specification on the dataset, various analyses and tests were carry out,mainly based on raster DEM dataset, and with the most functions of spatial analysis , such as the neighborhood statistic, in the ARCGIS platform. The advantage and limitation of the technique related with statistical analysis on the area and classification of the terrain-unit were explicated with map, chart and graph. As the result, the specification of the dataset includes the content of the appropriate size of grid-cell, terrain-unit cell,and the type classification on the morphological relief, elevation, and slope.