三角点

This paper discusses in detail the range of lon gitude of ascending node of the orbits, by which point and area targets can be c o vered in different conditions by considering the disturbance of the earth shape J2 using a sphere triangle method, and provides a whole analytic expressio n.

利用球面三角方法详细讨论了在考虑地球形状J2项的摄动影响时，各种情况下能覆盖目标点的轨道的升交点经度范围，并将其推广到对区域目标的覆盖，给出了完整的解析表达式。

This research focuses on evaluating the accuracies of trilateration and offset methods. In this research, two accident scenes are setup: one is on the flat road, and another one is on the hill.

除此之外，本研究在直角坐标法中，增加距离的观测量，配合三角几何条件，藉此弥补基准线与基准线外之测量点的连线不成直角的情形。

After aligning the user's specified feature correspondence, the correspondence can be established by overlapping the embeddings.

类似地，对于两个封闭的三角网格，作者将它们投影到球面上，通过调整网格使特征点对齐并通过合并来建立顶点对应关系。

In the theories, author used the arithmetic of inserting point by point to constructed Delaunay triangulations and used Visual C++ and OpenGL to displayed the 3D digital model.

在这些理论基础上，采用逐点插入算法在椭球面上建立Delaunay三角网，并使用Visual C++和OpenGL对建立的数学模型实现了三维显示。

In the first place, this paper reviews two main methods in surface triangulations, named as plane-projection and direct triangulation. For the former, Delaunay triangulations are mainly enunciated.

本文回顾了三维散乱点集曲面三角剖分的两种主要方法即平面投影法和直接剖分法，对几种常用的算法作了较为详细的描述，同时对剖分算法中经常出现的数据结构作了详细的介绍。

In the first place, this paper reviews two main methods in surface triangulations, named as plane projection and direct triangulation. For the former, Delaunay triangulations are mainly enunciated. For the later, algorithm developed by B. K. Choi is particularized. Some typical algorithms are introduced in detail, as well as various data-structures built in these algorithms.

本文回顾了三维散乱点集曲面三角剖分的两种主要方法即平面投影法和直接剖分法，对几种常用的算法作了较为详细的描述，同时对剖分算法中经常出现的数据结构作了详细的介绍。

It is pointed that, in practical engineering, it is necessary to develop new algorithms with new criteria for triangulations of scattered points sampled from complicated surfaces so as to maintain the properties such as better smoothness and shape preserving. Finally the time and space complexities of various algorithms are briefly and concisely discussed, also the research trend of surface triangulations based on 3D arbit rary point-sets.

最后简要地讨论了算法复杂度以及目前剖分的主要研究方向，并指出在实际工程应用中对复杂曲面采样得到的散乱点集，要得到光顺和保形的三角剖分，需要新的剖分准则和算法。

The Three-dimensional measuring dispersed points become into Delaunay triangle triangulations.

三维测量离散点集Delaunay三角网化。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。