基于地性线分级的DEM信息量计算方法研究  

Research on the Calculation Method of the DEM Information Measurement Based on the Grading of the Topographic Characteristic Lines

作　　者：张萍[1] 江文萍[1] 邓晓龙[1] 李伟[1] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079

出　　处：《测绘与空间地理信息》2016年第7期27-30,33,共5页Geomatics & Spatial Information Technology

基　　金：国家自然科学基金项目(41371428;41201473);国家基础科学人才培养基金项目(J1103409)资助

摘　　要：主要对基于DEM提取的地性线进行信息量的定量分析,探讨地性线的信息量与分辨率、地形单元的关系。这个过程中首先利用河网的自相似理论研究与当前DEM所代表的地貌详细程度相适宜的地性线提取的阈值区间,并讨论此阈值下地性线的分级,以此为基础通过以该分级为权重进行DEM地形信息量的计算。实践证明,这种顾及地性线等级的DEM信息量计算方法能较准确地反映地性线的分布规律和不同等级的要素造成的信息量度量差异。The paper discusses about the quantitative analysis of the information measurement of the topographic characteristic lines based on DEM, and also talks about the relationship between information measurement and the resolution and different terrain units. Through the self similarity theory, we can find the appropriate threshold for the detailed level of the current DEM, and it also discusses about the weight for information measurement of DEM through the classification of the topographic characteristic lines. The practice has proved that this kind of information measurement of DEM can accurately reflect the distribution regularities of the topographic charac- teristic lines and the difference of the information measurement caused by different levels.

关 键 词：地性线 阈值 权重 信息量 分辨率 

分 类 号：P208[天文地球—地图制图学与地理信息工程]