基于四叉树的LOD地形简化及几何变形纠正  

The LOD Terrain Simplification Based on Quad Tree and Geomorphing Correction

作　　者：刘海飞[1] 臧德彦[1] 车建仁[1] 

机构地区：[1]东华理工学院测量系,江西抚州344000

出　　处：《测绘与空间地理信息》2006年第2期48-51,共4页Geomatics & Spatial Information Technology

摘　　要：论述了一种基于四叉树结构LOD地形快速简化及几何变形纠正方法。通过建立四叉树结构将地形划分为规则的多个小块,利用一个递归过程遍历四叉树结构。在判断过程中本文将地形粗糙度因素加入到节点评价系统当中,有效地实现了地形的简化。对漫游过程中出现的几何变形现象引入一个混合因子到节点评价系统中,较好地解决了几何变形问题。为了更真实地反映地物地貌,本文将具有较高分辨率的航空影像叠加到DEM地形模型上,取得了较好的效果。This paper discusses an algorithm of LOD based on Quad Tree data structure and a method of how to correct the geomorphing. The step is to divide the terrain into many small regular quads using a quad tree structure and to make the quad tree traversal using a recursion. In this paper, the roughness of the terrain was considered in the valuation system, it was simplified the terrain efficiently. In order to resolve the geomorphing, this paper introduced a blend factor into the valuation system. It was testified that the blend factor can resolve this problem preferably. At last, the high resolution aerial photograph was overlapped on the DEM model.

关 键 词：LOD DEM 四叉树 几何变形 

分 类 号：P208[天文地球—地图制图学与地理信息工程]