坐标

Some surveyors often misapply the coordinate data in performing cadastral survey, cause of the renewal of the coordinate system in Taiwan and the cadastral survey successively adopted the measurement achievements of many kinds of different coordinate systems, and lacked the tight relation with different area.

台湾地区之地籍测量随著坐标系统的更新，先后采用多种不同坐标系统之测量成果，且不同测区间缺乏严密的关联，常造成部分测量人员办理土地复丈未予查觉而误用，在新的TWD97坐标系统公告后，新测之地籍测量成果均以此系统为基准。

First of all, the original input data weighted to calculate the weighted center of gravity after the data coordinates, will be moved to the coordinates origin Ping The center of gravity coordinates, re-normalized.

首先 将原始输入数据加权，计算加权后数据的重心坐标，将坐标原点平移到该重心坐标，再作归一化处理。

System speaking of the Master CAM, first must establish the components the geometry model, according to the components actual size, draws its processing part the contour line, does not need to draw the entire components the model, guaranteed the computation production the cutting tool way coordinates accuracy, and may use the Master CAM Chinese Library level the function, when determination cutting tool way, transfers or the hideaway, the selective treatment needs contour line; Next, the formulation processing craft and the definite craft parameter, chooses the cutting tool, the processing semi finished materials, the work piece origin of coordinates again and so on, establishes the work piece coordinates system, definite work piece coordinate system and engine bed coordinate system relative size, thus obtains the components processing correct cutting tool way; Finally, the simulation function which system provides using the Master CAM, the realization simulation processing.

对于Master CAM系统而言，首先要建立零件的几何模型，根据零件的实际尺寸，画出其加工部分的轮廓线，无需画出整个零件的模型，以保证计算生成的刀具路径坐标的正确性，并可利用Master CAM中图层的功能，在确定刀具路径时，加以调用或隐藏，来选择加工需要的轮廓线；其次，制定加工工艺并确定工艺参数，再选择刀具、加工毛坯、工件坐标原点等，建立工件坐标系统，确定工件坐标系与机床坐标系的相对尺寸，从而得到零件加工的正确刀具路径；最后，利用Master CAM系统提供的仿真功能，实现模拟加工。

At last, the author presents the multi-coordinate NC machining methods of turbine wheel with non-developable ruled paraboloid.

从理论上深入分析了叶型为非可展直纹抛物面的叶轮的五坐标侧铣、四坐标侧铣和三坐标端铣数控加工计算方法。

Using computer to control camera to shot the object continually and process the image timely, the pels coordinates of the laser can be get accurately. The 2-D coordinate can be changed to 3-D coordinate based on the arithmetic model builded and the automatic measurement is completed after the object can be rebuild as point cloud.

利用计算机控制摄像头对实物进行连续拍摄，并对图像进行实时处理，从而获得精确的激光线上的像素点坐标，利用建立的算法模型，将已知的二维坐标转换成三维坐标，以点云信息的形式重构出物体，完成三维自动测量。

Room as the rotating coordinate conversion, as space coordinates and spatial coordinates, as the mapping.

象点空间坐标的旋转转换，像空间坐标与像空间辅助坐标之间的变换。

Then the Cartesian coordinates was converted to spherical coordinates in which the watermark was embedded.

先将3D物体模型转换到仿射不变空间，然后把顶点坐标转换到球面坐标，利用球面坐标来嵌入水印。

Firstly, we use the mixed coordinates. More precisely, we use the spherical coordinates for independent variables in space, and so avoid the approximation of boundary conditions on the surface, which is required, if we use the Descartes coordinates.

我们所设计的求解Navier-Stokes方程的混合谱格式具有如下的一些特点：首先，我们采用混合坐标方法，即用球面坐标表示空间自变量，而用Descartes坐标表示速度分量。

More precisely, we use the spherical coordinates for independent variables in space, and so avoid the approximation of boundary conditions on the surface, which is required, if we use the Descartes coordinates. Next, we use the Descartes coordinates for the components of velocity, which simplifies the actual computation and numerical analysis essentially.

我们所设计的求解Navier-Stokes方程的混合谱格式具有如下的一些特点：首先，我们采用混合坐标方法，即用球面坐标表示空间自变量，而用Descartes坐标表示速度分量。

The coordinate systems are often transformed under a set of transformation parameters, but accuracy of coordinates are low in large area.

摘 要：对于大范围测区的坐标转换，如果利用同一套坐标参数进行转换会使坐标精度损失很大。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。