Preliminary study on specification of basic terrain-unit dataset
WANG Hong, WANG Jun(Chinese Academy of Surveying and Mapping, Beijing 100039, China)
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.