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《Science of Surveying and Mapping》 2014-08
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Identification and extraction of flat-polygon terrains in grid DEM

XU Jing;WANG Chun;ZHANG Yao-min;GU Liu-wan;College of Geographic Information and Tourism,Chuzhou University;College of Surveying and Mapping Science and Technology,Xi'an University of Science and Technology;  
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 accuracy was good;the grid size of DEM had significant effect on the expression of flat terrain,and 3×3grids was a suitable choice;the existing multi-scale DEMs have a certain degree of distortion in representing the flat-polygon terrains,which needs to be improved.
【Fund】: 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)
【CateGory Index】: P208
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