根据正投影的机理，建立了点线面屏幕坐标与空间关系的转换关系。

According to mechanism of orthographic projection, this paper has set up the converted relation between screen coordinate and space coordinate.

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照相机空间中 Z 坐标的最大值和最小值由投影矩阵转换 Z 坐标的方式来定义。

The minimum and maximum Z coordinates in camera space are defined by how the projection matrix transforms the Z coordinate.

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将来自不同国家的数据源进行数据转换、投影变换和误差校正，转换为统一的数据格式和投影坐标系统。

The data from the data sources of different countries are converted into the unifying data format and projection coordinates system by data conversion, projection conversion and error correction.

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