An Analysis on the Pseudo-Azimuthal Projection

The pseudo-azimuthal projection has a closed isoline of deformation.It is suitable for regional maps usually put forward certain requirements in both areal and angular deformations.In this paper,through analyzing the forms of ρ and δ,and the functions of different parameters,following points have been discussed:1,The influence of the forms of ρ and δ and the value of parameters upon the size and distribution of deformations,and the interrelations between them.2,The principles of defining the forms of ρ and δ and of selecting parameters when designing a pseudo-azimuthal projection.3,The approach to design a good pseudo-azimuthal projection in accordance with the predetermined values.Lastly,based on different viewpoints,four pseudo-azimuthal projection schemes for the whole Chinese territory have been suggested.