| 一种多源DEM数据无缝拼接融合方法 |
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| 引用本文： | 刘胜旋,关永贤,王克平.一种多源DEM数据无缝拼接融合方法[J].海洋测绘,2021(4):57-60. |
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| 作者姓名： | 刘胜旋 关永贤 王克平 |
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| 作者单位： | 南方海洋科学与工程 广东省实验室(广州),广东 广州 511485 ；中国地质调查局 广州海洋地质调查局,广东 广州 510075;海军研究院,天津 300061 |
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| 基金项目： | 国家重点研发计划(2018YFC0310000) |
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| 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。
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| 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 |
A seamless fusion method for mulit-source DEM data |
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| LIU Shengxuan,GUAN Yongxian,WANG Keping.A seamless fusion method for mulit-source DEM data[J].Hydrographic Surveying and Charting,2021(4):57-60. |
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| Authors: | LIU Shengxuan GUAN Yongxian WANG Keping |
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| Abstract: | 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,which is in accord with the grid spacing of DEM. And then use these interpolation nodes to extract the elevation from the two DEMs 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 DEMs is achieved. |
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