职称论文发表期刊摘要： 数字高程模型是地学研究分析中基础型数据，在GIS研究中，其他地形信息如坡度等须以DEM为基础进行提取，其数据分辨率的变化会对提取结果产生较大影响。坡度是地学研究中重要的研究论文参数，本文以凉水实验林场为研究区域，用2009年等高线数据建立多种分辨率DEM，在此之上提取出的坡度数据，进行对比分析，研究坡度与DEM分辨率的变化关系，为实际应用中职称论文发表DEM分辨率的选择提供依据。主要研究内容和成果如下： （1）等高线建立的不同分辨率DEM的质量分析。DEM对于山地地形地貌特征能够得到比较真实的展现，在实验的精度要求之内，不同分辨率DEM提取的等高线数据与原始数据基本重合，弯曲程度相差在容许范围内，对于突出的山地特征的表现基本一致。 （2）坡度与DEM分辨率的变化关系分析。DEM分辨率的降低时，坡度数据随之降低，缓坡面积增大，陡坡面积减小，损失的地形信息增多。
关键词： 地图制图学与地理信息工程；数字高程模型；分辨率；坡度；对比分析
KANG Shilun， ZHENG Xinqi*
（ School of Information Engineering,China University of Geosciences (Beijing),Beijing,100083； ）
Abstract： DEM is the foundation to study geography. In GIS research, other terrain data like slope shall be based on DEM, so the precision of DEM will affect the subsequent research significantly. Slope is the important parameter in the investigation. This paper chose Liangshui Experimental Forest Farm as the study area, based on the contour data of 2009 to get DEM and slope, through comparative analysis to study the relationship between them. So we can know more about DEM and slope , and give advice for application. The main research contents and results are as follows: (1) The quality analysis of DEM: for the same area, DEM build by ArcGIS can show real. For the mountain features, such as ridge, valley, valley line, dividing line, assembly line are basically the same. (2) The relationship between DEM and slope: when the resolution ratio of DEM decreases, slope decreases, gentle slope deceases and steep slope rises, the loss of terrain information increased. Under the 75m, average slope and DEM changes approximation show a liner correlation; exceed that, they show logarithmic function relation.
Keywords： Cartography and geographic Information engineering;Digital elevation model; resolution ratio; slope; comparative analysis
