摘要
数字高程模型(DEM)是地形分析的基础。DEM的栅格大小直接影响着分析的结果。而栅格大小越小,尽管越能精确的反映和描述地形变化情况,但是计算量也是大量的增加。所消耗的代价也大大增加。因此DEM栅格尺度对地形因子的影响研究具有极其明显的意义。本文通过对浙江省桐庐县的丘陵地区和云南省洱海地区的山地地区为例。在不考虑数据误差的基础上,通过定性定量地比较不同栅格尺度对坡度、坡向的影响,得出对两种地形的异同点。为以后的实际工作起到一定的指导作用。
Digital elevation model is the base of terrain analysis. Different scales of raster of DEM affect results of analysis. Thought the smaller the grid is, the accurater the deseription of terrain is, the larger the quantity of calculation is. As a result, Study on the influence of different size of grid on terrain factor in DEM has great value. This article takes Tonglu county in Zhejiang province （highland） and Erhai in Yunnan province as examples. The differences and commonness of two terrains are learned through comparing affection of different scales of raster on Grade and without thinking about errors of data. It can guilt later work on terrain analysis.
出处
《现代测绘》
2007年第6期3-6,共4页
Modern Surveying and Mapping
