多尺度数字高程模型

以岩土工程边坡数值模拟仿真可视化为研究对象，分析、研究了数字高程模型(DEM)和样条函数。将非均匀B样条曲面拟合和准均匀B样条小波多尺度分解结合起来，实现多尺度DEM地形建模方法，设计了相应的算法。实验结果表明，其建模造型效果逼真，多尺度分辨率明显，是一种高效实用的建模方法。

Multi-scale digital elevation model approach

The real-time modeling and rambling on the multi-scale and different resolution digital elevation model(DEM) are very important in the geographic information system(GIS) technique;but,simultaneously,it is also of difficulties in algorithmic programming.Herein both DEM and spline functions are analyzed and studied in rather detailed fashion with more attentions to the visualization and numerical simulation of geotechnical slope objects.By banding together both the approaches,which are nonuniform B-spline surface fitting and quasi-uniform B-spline wavelet multi-scale decomposition,the modeling multi-scale digital elevation model(MsDEM) is performed;and the related algorithm is derived.The proposed approach,MsDEM,is applied to a visualized simulation of the slide DEM,which is based on the field data of Hanjiaya slope located in mountains in one constructing Wuhan-Shiyan Highway.The results manifest that the algorithm modeling is realistic and the multi-scale resolution is visible.The proposed modeling approach is efficient and promising.