[Proj] proj=undef ??

[support.mn at elisanet.fi]

Hello,

there is a need to have an undefined projection with
possible datum shift like:

proj=undef
ellps=bessel
towgs84=.....
no_defs

That would then transfer the projection input to output
without doing any forward or inverse calculations even
if those routines called but allowing datum shifting.

So the absolutely minimal definition would be

proj=undef
datum=undef

or shorter version

proj=undef

and that would feed all input directly to the
output. Those switches would allow the
end user to control the handling of the data.

So the "proj=undef" is same as not doing anything
by the projection library if called but not giving any error
messages about missing projection but doing all
datum shifting if requested. Any ideas?

Regards: Janne.