[Proj] Why use pj_inv() and pj_fwd() instead of pj_transform() ?

[fabrice martin]

Hello,



I'm a recent user of PROJ.4, and I don't exactly understand the
difference between pj_inv(), pj_fwd() and pj_transform() ? Or said
differently, why use proj and invproj instead of cs2cs ? I have the
impression that cs2cs is more powerful than the other programs, since
it can handle prime meridians (+pm), and also geographic coordinates
with +longlat .

Are there special features in pj_inv(), pj_fwd(), or has it been superceded by pj_transform() ?



Thank you,

Fabrice



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