摘要
在分析微地形特点以及现有网格DEM在表述微地形中存在的不足的基础上,提出了面向对象的数字高程模型,给出了该模型的形式化描述和以点云为数据源构建面向对象数字高程模型过程中采用的对象边界的识别、特征保持的点云疏化、基于属性近似的网格约化及对象识别等关键步骤的方法。并以实例证明了此过程的可行性。
When use Grid DEM to describe Micro-terrain, some importance information such as break-line will be lost. So using Grid DEM to construct DEM can＇t keep precise. Based on analyzing the characteristic of Micro-terrain and the insufficiency description capability of Grid DEM, we present an Object Oriented Digital Terrain Model （OODEM） to precisely describe Micro-terrain. We also present the method of main step to construct OODEM such as object boundary recognize, feature-preserved point clouds thinning and attribute approximately based mesh simplification and object recognition. A sample is adduced to prove the feasibility of the process.
出处
《地理信息世界》
2009年第1期32-37,共6页
Geomatics World
基金
国家863项目资助(2006AA12Z212)
南京农业大学青年科技创新基金项目资助(KJ08028)
关键词
DEM
微地形
点云
面向对象
数字高程模型
DEM
Micro-terrain
Point Cloud
Object Oriented
Digital Terrain Model
