要按照距离进行查询，必须使用投影坐标系。
To query by distance, you must use a projected coordinate system.
根据地图投影坐标系，经过数学推导，将地图信息要素进行数字化。
A method of digitization of map information was mathematically conducted and a computer programme was developed, according to the coordinate systems in cylinder and cone map projections.
地理和投影坐标系都包含对地球形状的假设(一个略扁的球体)；这称为大地基准点。
Both geographic and projected coordinate systems include a definition of the assumed shape of the earth (a flattened sphere); this is called the geodetic datum.
如果这些假设对于您的数据库不成立，那么必须做某些调整，这些调整可能很简单(比如对于列名)，也可能比较复杂(比如对于投影坐标系)。
If any of these assumptions are not valid for your database, you have to make adjustments that vary from trivial (for column names) to somewhat involved (in the case of a projected coordinate system).
空间仿射坐标系的平行投影问题在计算机图形识别、跟踪目标及三维实体重建中具有重要意义。
Parallel projection of the affine coordinate system has a significant impact on computer graphics recognition, object's tracking or solid model reconstruction.
地理信息系统软件主要应用于地理信息系统部门，所用到的坐标系与地图投影密切相关。
The GIS software is mainly applied to the department of Geography Information system. Its coordinate system is closely related with map projection.
空间仿射坐标系的平行投影问题在计算机图形识别、跟踪目标及三维实体重建中具有重要意义。
Parallel projection of the affine coordinate system has a significant impact on computer graphics recognition, objects tracking or solid model reconstruction.
对三维图形计算机显示的基本原理进行了讨论，详细介绍了坐标系变换、投影变换和明暗处理及光照模型的基本原理。
Then, the basic principles of drawing 3d graph by computer are discussed, particularly explained the fundamental theory of coordinate transform, projection transform and light model.
它首先生成一套新的正交坐标系，所以投影到坐标系的点都有最大差异。
It constructs a new set of orthogonal coordinate axes such that the projection of points onto them have maximum variance.
通过对地图投影原理的分析，提出了将我国目前通用的80坐标系所采用的IAG75椭球进行投影变换的方法。
Through analyzing the theory of projection, this paper gives an projection transform method by which can convert IAG75 spheroid, used by 80 coordinate system, which widely used in China.
本文在广义坐标系中采用投影和透视变换理论建立了网条结构光三维视觉检测模型。
Using projective and perspective transformations, the mathematical model of 3d vision inspection for grid structured light is established in homogeneous coordinate system in this paper.
该文主要论述了在潜艇航行训练模拟器三维视景仿真中，把三维模型投影到屏幕坐标系当中的方法。
This paper puts forward the method of locating the 3D model in the screen coordinate in the design of the visual system of a submarine voyage training simulator.
通过摄像机和投影仪的透视投影模型，推导了摄像机坐标系、投影仪坐标系和世界坐标系之间的坐标变化关系。
Relations of coordinate transform among camera coordinate system, projector coordinate system and world coordinate system are derived based on perspective projection models for camera and projector.
实物坐标系经过一系列变换通过三维显示的二维投影面与显示坐标系统一。
World coordinate that had undergone some transform such as translation, and rotation was unified with display coordinate through 2D projection plane of 3D display coordinate.
局部坐标系列世界坐标系的坐标变换可用于简化三维绘图，而世界坐标系到局部坐标系的坐标变换可用于产生透视投影。
The transformation from WCS to LCS can simplify the 3D drafting. The transformation from LCS to WCS can be used to generate the perspective projection.
局部坐标系列世界坐标系的坐标变换可用于简化三维绘图，而世界坐标系到局部坐标系的坐标变换可用于产生透视投影。
The transformation from WCS to LCS can simplify the 3D drafting. The transformation from LCS to WCS can be used to generate the perspective projection.
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