For fast calculating the signed distance from spatial point to STL model, a reference ball method was put foward based on linear octree.
针对如何快速求取空间点到STL模型表面有符号距离这一问题，提出一种基于线性八叉树的参考球方法。
However, current commercial GIS software are short of special spatial point pattern analysis module which limit the use of point pattern analysis.
然而现有的主流商业GIS软件包，缺乏专门的空间点模式分析的模块，限制了点模式方法的使用。
The rotation matrix can be linearly acquired by using only 4 vanishing points and the translation vector can be linearly solved by using only 2 spatial point objects.
该方法仅需4对消隐点象面坐标便可线性求解出旋转矩阵，再用2个空间点坐标便可线性求解出平移矢量。
The rotation matrix can be linearly acquired by using only 4 vanishing points and the translation vector can be linearly solved by using only 2 spatial point objects.
该方法仅需4对消隐点象面坐标便可线性求解出旋转矩阵，再用2个空间点坐标便可线性求解出平移矢量。
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