[Proj] Problem understanding the new API
matthias.gabriel at etit.tu-chemnitz.de
Mon Feb 19 10:07:49 EST 2018
I've been using the old proj4 API successfully an did understand that by
specifying source and target systems i could transform my coordinates.
Now I tried to use the new API (proj.h) which seems to be much cleaner
and easier to use. I checked the manual and found:
"the fundamental concept of transformations in PROJ are now handled in a
single transformation object (PJ) and not by stating the source and
destination systems as previously."
Ok, fine.. understood. Unfortunately my problem definition is still the
same: given a set of coordinates in source system A I want to calculate
their representation in system B. ..
So before it was straight-forward: I specified what I had and what I
wanted, but now I don't know how to get the required "direct
transformation" from A to B using the new API?! I tried to use a
cs2cs-style string with the "+to" specifier but that didn't work.
proj_create_crs_to_crs would be an option but doesn't quite suit my
problem (we don't use EPSG codes etm).
Could you please give me a hint on how to proceed here?
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