查询词典 paraboloidal coordinates

This article focuses on the line-line, line-region and region-region topological relations algorithm, which come down to the same question: whether there are intersections between line and line. The sweep-line algorithm was studied by many people, but has some deficiencies to be improved, in order to handle some special cases and increase program efficiency. My works as follows: rectangular envelope to reduce executive times , vector cross multiplication to determine intersection between line and line, coordinates and slope method to deal with some special cases. C program examples are showed together.(5) Finally, to prove capability and efficiency of the model and calculation method, some test systems are developed. For example, complex spatial topological relation query, parcels' exact area with the area of linear object reduced in land use, quality inspection to cadastral data according to topological rule, spatio-temporal change query of cadastral data.

将线线、线面、面面之间的拓扑关系实现的算法归结为线与线之间求交的基本问题；为处理一些特殊的拓扑关系情况，提高扫描线算法的效率，探讨了包络矩形粗滤、判断线线是否相交的矢量叉乘法、线节点重合或共线的斜率坐标判断法等改进方法；同时还设计了一种新的节点微小圆求交的算法，可应用于图斑与线状地物细分拓扑关系及地类面积的计算；（5）本文设计了实验系统，包括复杂对象的拓扑关系表达与计算程序、图斑地类面积的计算程序、基于空间拓扑关系规则的地籍数据库质量检查功能，以及时空拓扑关系和变化语义分析等原型，验证了拓扑关系表达模型和计算方法的可行性和实用性。

All the local 3D world coordinates of the control points falling on two light stripe planes can be readily obtained by the invariance of the cross ratio.

利用构建的分别位于两个光平面上标定特征点，可以实现工作状态的十字结构光传感器参数的优化估计。

Analyse the tooth geometry of Klingelnberg Cyclo-Palloid spiral bevel gear.,according to the relative position and kinematic relation of the cutter heads,virtual crown gear and the processed wheel blank,established the system of coordinates of the gear cutting, dedcuced the tooth face equation of the virtual crown gear, according to relations of the gear cutting and space theory of engagement, deduced the tooth face equation of klingelnberg Cyclo-Palloid spiral bevel gear, and drawing the three-dimensional graphs of the virutal crown gear and Klingelnberg Cyclo-Palloid spiral bevel gear according to the design and setting parameters.

根据铣齿加工中刀盘、摇台和轮坯的相对位置和相对运动关系建立了切齿啮合坐标系，由矢量的旋转推导了产形轮齿面方程；根据空间啮合原理和切齿啮合关系推导了被加工齿轮的齿面方程；由设计参数和铣齿调整参数计算得到齿面离散数据，绘制了产形轮和摆线齿锥齿轮的三维齿形。

Then we derived the expression of electromagnetic force in the electromagnetic crystallizer in the cylindrical coordinates.

进而推导出在柱坐标系中，电磁结晶器内电磁力的表达式。

The model types include frequency histogram,cumulative frequency distributing graph and theoretical model with double logarithmic coordinates.

模型类型包括频率直方图、累积频率分布图以及用双对数坐标表示的理论分布模型。

In this case, we pull the current coordinates of the mouse and assign their logical

在本例中，我们获取到鼠标当前的坐标然后将它对应的逻辑坐标赋值给pCurrent变量。

Then we want to get the current coordinates of the image that are visible.

接下来我们需要获取可视图片当前的坐标位置。

A map will show you the current, approximate GPS coordinates for your iPhone.

地图将显示您当前，全球定位系统坐标近似为你的iPhone中。

In Point_draw we print the current coordinates in a way which pic can understand

在 Point_draw函数中我们将点的坐标以pic程序可读的形式打印出来

Show map extent and current mouse coordinates .

显示当前地图视野范围以及鼠标光标的地理坐标。

The Master of Science degree program in Economics features a curriculum that is flexibl...

在经济学理学硕士学位的课程计划的特点是灵活而全面的方法，在理论和应用课程培训工作。

This module is used for constructing and visualizing 3D models.

该模块是用于建设和可视化的三维模型。