[Proj] cs2cs vs. proj??

[Gerald I. Evenden]

On Monday 16 February 2009 11:04:54 am Frank Warmerdam wrote:
> Gerald I. Evenden wrote:
> > A question has arisen in my mind as to what is the difference between the
> > programs cs2cs and proj?  What does one do that the other does not?
> >
> > On the surface the names would imply that one deals with transforming
> > data between datum systems, which may include projections as a
> > suboperation, and the other would deal with only cartographic
> > projections.
>
> Gerald,
>
> This is essentially the case, yes.  The cs2cs program uses the
> pj_transform() functions which includes support for datum shifts,
> prime meridian shifts and goes from one coordinate system to another.
>
> The proj program on the other hand is largely unchanged from the
> original, uses pj_fwd() and pj_inv() and does not support any
> of the extended capabilities of pj_transform().
>
> > Obviously, as I am painfully aware, this is not the case.
>
> I'm not sure why you think this is not the case.

I suspect that it is because some of the conversations are discussing the 
library as proj.

PS: the line in proj-4.4.9/man/man1/proj.1

       The geod program provides the ability to compute
       geodetic (Great Circle) computations.

should read "geodesic" and not geodetic.

-- 
The whole religious complexion of the modern world is due
to the absence from Jerusalem of a lunatic asylum.
-- Havelock Ellis (1859-1939) British psychologist