Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
2
According to the theoretical tooth surface model, the measuring grids schema is accomplished on the rotary projection of tooth surface, and coordinates and the normal of the grids are obtained.
根据建立的理论验面模型，在齿面的旋转投影面上进行测量网格规划，得到网格节点的坐标和法线方向。
3
Methods The maximum intensity projection (MIP) and surface shade display (SSD) CTP images were performed in 60 normal subjects and 108 patients suspected of hepatic diseases.