球面投影

The selection of map projection is very important for the production of maps. Its primary task is to decide the mapping equations for the coordinate conversion from the sphere to the plane.

制作地图过程中，选择投影是一个重要的程序，它主要任务系决定制图区从球面转换至平面的制图方程式。

When cylinder surface and cone surface penetrate each other,if their axises intersect slantly and are parallel to the frontal projecting plane,there will he special points in the penetrating line.

本文对轴线斜交，且两轴线平行于某一投影面的圆柱面与圆锥面相贯时，相贯线上的特殊点进行探讨，从而得出了用辅助球面法不能求出该相贯线上的最右点的结论。

The results show that the design method which unifies the stereographic projection and the spherical triangle analytic geometry is one kind of both simple and the quick methods.

研究表明，采用极射赤平投影和球面三角形解析几何相结合的设计计算方法，是一种既简便又快捷的定向钻进轨迹设计方法。

A 3-D face model is constructed by the imaging theory and spherical harmonics, combining with the principle of 3-D projection and PCA.

根据3-D数据的优势，利用图像成像原理和球面调和函数理论，结合3-D投影原理和PCA技术建立了一个3-D人脸模型。

The projecting directions of three affine pictures form affine coordinate system , and they also form a triangular pyramid at the same time.

用 3 个仿射图的投射方向构成 1 个仿射坐标系，同时也构成 1 个三棱锥，在此仿射坐标系中用球面三角重新研究由两个仿射图求第 3 个仿射图的投影作图理论——平行线束法。

As the most important factor in the proposed calibration methods, vanishing point are addressed through the whole paper.

该方法既不需要将直线投影到球面坐标，也不需要对大量直线作统计特性分析，当存在大量多余直线观测时，这种平差方法可快速、准确地计算出灭点的最优位置。

In order to solve the problems in system of four aspheric mirrors, Fresnel mrirror and the catadioptric projection lens, the method that free form surfaces were used to design ultra-thin imageing system was put forward at last.

为了解决上述四片非球面系统、Fresnel反射镜和折反系统结合投影镜头存在的问题，本文最后提出了采用自由曲面设计超薄成像系统的方法。

When investigation the area is in umbriferous belt near the brim when, difference is achieved between the spherical area of same figure spot and planar area the biggest.

当调查区处于投影带边缘四周时，同一图斑的球面面积和平面面积之间差异达到最大。

The both differences of area vary with the determinate rule.

当调查区处于投影带边缘附近时，同一图斑的球面面积与平面面积之间差异达到最大。

Under the unified coordinate system of the earth's core, sphere azimuthal projection varied and inverse transformation are described. Methods of dot quadrant tab and border tab based on object coordinate system are introduced. Algorithms of special border tab and area invasion warning examination are discussed.

在统一地心坐标系下，结合球面方位投影变换及逆变换，定义了目标坐标系以及在目标坐标系下的顶点象限标号和边标号，提出了特殊边标号处理算法及侵入区域的告警检测算法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失