引用本文: 胡毓钜. 变比例尺地图投影系统[J]. 武汉大学学报 ( 信息科学版), 1987, 12(2): 47-54.
Hu Yuju. Cartographic Projection System for Variable Scale Maps[J]. Geomatics and Information Science of Wuhan University, 1987, 12(2): 47-54.
 Citation: Hu Yuju. Cartographic Projection System for Variable Scale Maps[J]. Geomatics and Information Science of Wuhan University, 1987, 12(2): 47-54.

## Cartographic Projection System for Variable Scale Maps

• 摘要: 本文对编制城市游览图提出了变比例尺地图投影系统。通过由普通城市平面图向辅助球面作逆投影A,再由辅助球面向平面作非A投影,构成了变比例尺地图的数学基础。由不同性质的投影的组合,能起到适应不同城市街区结构的特点。使本系统具有相当的灵活性。文中还讨论了辅助球适宜的大小和不同方位投影之间的变换公式。文末试作了北京市的变比例尺地图。

Abstract: In this paper,a cartographic projection system in variable scale suitable for city tourist maps is put forward,The principle is that the mathematical basis for variable scale maps is established by an inverse projection(A) from a conventional city plan on an auxiliary sphere(AS) and then by a projection other than(A) from AS onto a new plane.The combination of various projections will play a role which satisfies the properties of different city structures,which ensures to the system certain flexibility.The size of the auxiliary sphere and the transformation formulas between azimuthal projections have been discussed as well.An experiment of the variable scale map of Beijing is calculated and the sketch shows the design is successful.

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