[PROJ] Check if a definition if a cartographic projection

[José Luis García Pallero]

Hello:

I'm porting an old PROJ4 code for strictly cartographic projections
(forward and inverse steps) to version 6 and I'm a bit confused about
the definition. I see that I must substitute the old pj_fwd() and
pj_inv() by theproj_trans() function, where I set the forward or
inverse step via the PJ_DIRECTION input argument. My questions are:

1. Is it possible (has PROJ6 any function or other method) to check
the definition in order to guarantee it is strictly a cartographic
projection?

2. Must be the geodesic coordinates for the forward cartographic
problem always radians?

On the other hand, I can read in https://proj.org/operations/index.html

"
Projections are purely cartographic mappings of the sphere onto the plane
"

But PROJ also works in the ellipsoid, so I suppose it is a mistake

Best regards

-- 
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José Luis García Pallero
jgpallero at gmail.com
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Use Debian GNU/Linux and enjoy!
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