一种计算迎风面密度的优化算法

An optimization algorithm for calculating the frontal area ratio

提出了一种基于最小外接矩形的计算迎风面密度的优化算法.该算法的核心问题是如何高效地求解建筑物沿着某一风向的投影面宽度(迎风面宽度).具体解决方案为:将不规则建筑物水平轮廓根据风向角度进行一定角度的旋转操作,使得旋转后建筑物水平轮廓的最小外接矩形的宽即为建筑物水平轮廓未旋转时的迎风面宽度.由于最小外接矩形及其旋转操作在当前很多图形系统软件中一般都有接口支持且运行效率非常高,用户也可以直接调用相关接口进行二次开发.因此,本方法具有较高的运行效率和应用便利性.

A new algorithm for calculating the frontal area ratio was proposed in this paper.The key issue of the algorithm was how to efficiently calculate the width of the projection surface(width of the windward side) of a building along a certain wind direction.The geometrical analysis showed that when the horizontal profile of irregular buildings was rotated by a certain angle which make the width of minimum bounding rectangle of the building s horizontal outline after the rotationoperation was width of the windward side of the building when it was not rotated.As the minimum bounding rectangle and its rotationoperation were generally supported by interfaces in many current graphics system software,and the computational efficiency of using these interfaces was also very high,this algorithm has high operational efficiency.In addition,users can quickly carry out secondary development on these interfaces.