基于线平衡点的时空演化分析  

Spatial-Temporal Evolution Analysis Based on Line Moment Balance Point

作　　者：李光强[1] 职露 尹健[1] 王彦坤[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《测绘科学技术学报》2015年第6期645-649,654,共6页Journal of Geomatics Science and Technology

基　　金：湖南省自然科学杰出青年基金项目(14JJ1007);高等学校博士学科点专项科研基金项目(20110162110056)

摘　　要：时空演化分析是时空数据挖掘和知识发现的研究热点之一。为实现定量表达线要素地理属性的时空演化特征,在力矩平衡原理的基础上,提出一种基于线平衡点的时空演化分析定量表达方法。该方法将地理属性力矩定义为线要素上各点地理属性值与该点到平衡点的线上距离的向量乘积,然后利用物理学力矩平衡计算公式求得力矩平衡点的位置。当不同时刻各点的地理属性值发生变化时,平衡点位置亦随之不断移动,进而利用平衡点与均质平衡点的偏移向量以及相邻时刻之间平衡点的转移向量,定量地表达线要素地理属性的时空演化特征。最后,通过实验验证了该方法的可行性以及有效性。The spatio-temporal evolution is a hot topic in the spatio-temporal data mining and knowledge discovery field. To quantitatively express the spatio-temporal evolution about a polyline feature, a spatio-temporal evolution analysis method based on line moment balance point is proposed in this paper. Referencing the physical moment balance conception, the geographical attribution torque is defined as the product of geographical attribution and line distance from corresponding point to balance point. With the help of the calculation formula of moment balance, the location of moment balance point could be calculated. The location of balance point would move with the change of geographical attribution values. The spatio-temporal evolution can be expressed quantitatively via the offset vector between balance point and homogeneous balance point and the transfer vector of the adjacent time. In the end, experiment is executed to show the feasibility of this method.

关 键 词：时空演化分析 力矩平衡 线平衡点 偏移向量 转移向量 

分 类 号：P208[天文地球—地图制图学与地理信息工程]