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绘制庞加莱截面图，在相空间中适当（要有利于观察系统的运动特征与变化，如截面不能与轨线相切，更不能包含轨线）选取一截面，在此截面面上某一对共轭变量如x1与x.1取固定值，称此截面为Poincare截面，相相空间的连续轨迹与Poincare截面的交点成为截点。
-Draw the Poincare sections in phase space appropriate (should be beneficial to observe the motion of the system charac
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Qhull computes the convex hull, Delaunay triangulation, Voronoi diagram, halfspace intersection about a point, furthest-site Delaunay triangulation, and furthest-site Voronoi diagram. The source code runs in 2-d, 3-d, 4-d, and higher dimensions. Qhul
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摄影测量学要解决的两大问题是几何定位和影像解译。几何定位就是确定被摄物体的大小、形状和空间位置。几何定位的基本原理源于测量学的前方交会方法，它是根据两个已知的摄影站点和两条已知的摄影方向线，交会出构成这两条摄影光线的待定地面点的三维坐标。影像解译就是确定影像对应地物的性质。-Photogrammetric space resection based on two known photographs of two known sites and photography direction of t
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RaySAR是一种能够产生SAR图像层的3D合成孔径雷达（SAR）模拟器
与详细的3D对象模型相关。 此外，它可以将3D位置和表面定位
相关点与反射雷达信号有关。(RaySAR is a 3D synthetic aperture radar (SAR) simulator which enables to generate SAR image layers
related to detailed 3D object models. Moreover, it enables one to
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RaySAR是一3D合成孔径雷达（SAR）仿真程序，基于matlab实现。(RaySAR is a 3D synthetic aperture radar (SAR) simulator which enables to generate SAR image layers
related to detailed 3D object models. Moreover, it enables one to localize the 3D positions and surface
interse
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简单判断线与面的关系以及面与面的关系，并且有开窗功能，保留相交线(A simple judgement of the relationship between line and surface, as well as the relationship between the surface and the surface, and the function of windowing, preserving the intersection line.)
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Mall-Kendall以气候、下垫面一致为前提，要求序列随机独立且同分布，用于突变点的识别。
UFk为一条随k变化的曲线，当n增加时，UFk很快趋于标准正态分布。
假设H0成立。给定显著性水平α，查算正态分布表得。当|UFk|＜时，接受原假设，即趋势不显著；反之，拒绝原假设，即趋势显著。
在坐标轴上绘制两条曲线，若相交，则交点为突变点。这就是Mall-Kendall法。(Mall-Kendall to climate and underlying surface consistent i
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