[Proj] Can I make definitions of bird-eye-view maps coordinates using proj4 and proj4text?

[OHTSUKA Ko-hei]

Hello,

I used proj.4 for transforms of many maps projections, but those
projections are ordinary maps'
projection, like stereographic, orthographic, gnomonic .. and so on.

But these days, I have a question if proj.4 can use for bird-eye-view maps
projection.
Are there any options for making definition of bird-eye-view maps in
proj4text?

Regards,
Ko-hei
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