高程注记对数字高程模型精度的影响模式研究  

Research on the Influence Pattern of Elevation Annotation on DEM Accuracy

作　　者：石志宽[1,2] 汤国安[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210046 [2]南京农业大学中国土地问题研究中心,江苏南京210095

出　　处：《南京师大学报（自然科学版）》2010年第3期109-115,121,共8页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：国家"863"项目(2006AA12Z212);南京农业大学青年科技创新基金(KJ08028)

摘　　要：以CAD形式记录的地形图中高程点和与之相应的注记点平面位置并非完全一致,直接使用有高程信息的注记点生成的DEM将含有误差,在分析注记点与高程点分布模式的基础上提出了通过建立两者之间的关联关系将注记点高程恢复到高程点的方法,同时在检验这种关联关系的可靠性方面提出了解决方案,并在分析注记点移位对所生成DEM误差的基础上提出了注记偏差指数作为衡量高程注记质量指标,为地形图的质量检查奠定了基础.The position of elevation point and the corresponding annotation is not exactly the same plane on topographic maps in the form of CAD,the DEM that directly extracted from the elevation annotation point will contains error.Based on the analysis of the distribution pattern between the elevation point and elevation annotation point,one method of recover elevation from annotation point to elevation point are proposed through establishing spatial relationship between them,at the same time,solutions are proposed to test the reliability of these relationships,on the analysis of error of DEM generated by the annotation points which occur displacement,the annotation deviation index is pointed out as a quality indicator to the quality of elevation annotation,which will be the foundation of topographic maps quality inspection.

关 键 词：数字高程模型 高程点 注记点 注记偏差指数 

分 类 号：P208[天文地球—地图制图学与地理信息工程]