一种多源DEM数据无缝拼接融合方法  

A seamless fusion method for mulit-source DEM data

作　　者：刘胜旋 关永贤[1,2] 王克平 LIU Shengxuan;GUAN Yongxian;WANG Keping(Southern Marine Science and Engineering Guangdong Laboratory(Guang zhou),Guangzhou 511485,China;Guangzhou Marine Geological Survey,Guangzhou 510075,China;Naval Research Institute,Tianjin 300061,China)

机构地区：[1]南方海洋科学与工程广东省实验室(广州),广东广州511485 [2]中国地质调查局广州海洋地质调查局,广东广州510075 [3]海军研究院,天津300061

出　　处：《海洋测绘》2021年第4期57-60,共4页Hydrographic Surveying and Charting

基　　金：国家重点研发计划(2018YFC0310000)。

摘　　要：针对两个存在重叠区域的多源DEM(digital elevation model)数据,经过坐标转换、高程统一、加密抽稀等初步处理后,在重叠区域内绘制一条多段重叠线并进行等间距节点插值,插值间距与DEM的网格间距一致。然后利用这些节点分别从两个DEM曲面上提取高程值,通过分析同一节点上两个DEM的高程偏差,最后分别对两个DEM重叠线缓冲区内的网格节点进行高程值调整,距离重叠线越近的网格节点,调整幅值越大,反之越小。利用本技术可实现两个DEM在重叠线处实现无缝拼接融合。For two different sources of DEM(Digital Elevation Model)data with overlapping,through the preliminary processing of coordinate transforming,elevation datum unification,densifying and reducing,the paper designs a polyline in the overlapping area and re-sampling the polyline with specified spacing,w hich is in accord with the grid spacing of DEM.And then use these interpolation nodes to extract the elevation from the two DEM s respectively.The elevation deviation of two DEMs at the same node is analyzed,and then the elevation value of the grid nodes in the buffer area near the overlapping line of the DEM is adjusted respectively.The closer the grid node from overlapping line,the larger is adjusted,the smaller on the contrary.Finally seamless fusion at overlapping lines of the two DEM s is achieved.

关 键 词：无缝拼接 无缝融合 数据融合 数据拼接 数字高程模型 

分 类 号：P231.2[天文地球—摄影测量与遥感]