摘要
以鄱阳湖实测地形散点、河道大断面及SRTM基础数据,结合遥感图像判断河道主流线、滩槽分界线,开发了由CAD格式河道大断面线性数据提取河道高程结点并转化为含地理信息高程结点的算法。采用正交网格曲线插值算法完成了河道断面曲面内插高程结点,重构了鄱阳湖流域湖泊及河道的数字地形。重构后的地形数据与实测数据相比较在河槽高程、形态及面积吻合较好;能满足在数字地球模型上进行三维仿真的需要,表明该方法的具有可行性和实用性。
Based on the measured terrain scatters of Poyang Lake,the large section of river channel and basic SRTM data,the algorithm that extracting elevation nodes from the CAD format linear data of large river channel section and then transforming them into those containing geographic information is developed in combination with the mainstream line and the boundary between floodplain and channel judged with the remote sensing images. Moreover,the interpolated elevation nodes of the curved surface of river section is completed with the orthogonal grid curve interpolation algorithm,while the digital terrains of the lakes and river channels within Poyang Lake Basin are reconstructed. Combined with the measured data,the terrain data after the reconstruction can coincide better with the actual elevations,landforms and areas of the river channels therein,thus can also meet the need of the 3- D simulation to be made on the digital earth model.
出处
《水利水电技术》
CSCD
北大核心
2014年第9期12-14,18,共4页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(41001292
51109052)
水利部公益性行业科研专项经费项目(201301003)
蚌埠学院工程中心项目(BBXYGC2013G01)
关键词
河道湖泊地形
数字地形重构
SRTM
三维仿真
鄱阳湖
terrain of river channel and lake
digital terrain reconstruction
SRTM
3-D simulation
Poyang Lake
