规则格网DEM中平直面状特征地形识别与提取  

Identification and extraction of flat-polygon terrains in grid DEM

作　　者：徐静[1,2] 王春[1] 张耀民[2] 顾留碗[1] 

机构地区：[1]滁州学院地理信息与旅游学院安徽,滁州239000 [2]西安科技大学测绘科学与技术学院,西安710054

出　　处：《测绘科学》2014年第8期163-166,共4页Science of Surveying and Mapping

基　　金：国家自然科学基金青年基金项目(41001301,41201415);教育部科学技术研究重点项目(212078);安徽省自然科学基金项目(1408085MD77)

摘　　要：随着人类活动的增加,平直面状地形已成为主要的特征地形之一,具有其特殊的地理学、水文学价值。鉴于现有的DEM数字地形分析模型中缺乏平直面状地形的识别与提取模型,文章以黄土梯田样区数据为基础研究构建了基于空间法向量的平直面状地形的识别与提取模型。实验结果显示,该模型具有较好的提取精度;DEM格网大小对平直面状地形的表达具有显著的影响,3×3DEM格网范围是比较妥当的统一核面,提取的平直面区域具有较好精度;我国现有的系列尺度DEM对平直面状地形的描述存在一定程度的失真,有待进一步完善。With the increase of human activities, flat-polygon terrains become one of the main terrain features with special geographical and hydrological value. In view of the fact that existing DEM-based models for digital terrain analysis lack ability to identify and extract flat-polygon terrain features, taking loess terrace banks data as an example, a model to identify and extract flat-polygon terrain features based on spatial normal vector was established in the paper. The experimental results showed that the extraction ac- curacy was good; the grid size of DEM had significant effect on the expression of flat terrain, and 3 × 3 grids was a suitable choice; the existing multi-scale DEMs have a certain degree of distortion in represen- ting the flat-polygon terrains, which needs to be improved.

关 键 词：DEM 平直面状地形 地形特征提取 地形描述误差 

分 类 号：P217[天文地球—测绘科学与技术] P208