[Proj] Different results with +ellps and +datum

Zarko Mocnik zarko.mocnik at triera.net
Tue Apr 20 18:26:24 EDT 2004

I noticed the following bahaviour of cs2cs:
proj -ld
I got:
__datum_id__ __ellipse___
       WGS84 WGS84        towgs84=0,0,0
When I enter:
cs2cs  +datum=WGS84 +proj=longlat +to +ellps=bessel +proj=longlat
15d29'1.2737 46d36'44.7813
I got:
15d29'18.941"E  46d36'46.661"N -21.034
But if I change command line to:
cs2cs  +ellps=WGS84 +proj=longlat +to +ellps=bessel +proj=longlat
15d29'1.2737 46d36'44.7813
I got:
15d29'1.274"E   46d36'42.631"N 704.788
I would expect the same result (the first one) in both cases.
Is this I bug or a feature?
I use cs2cs Rel. 4.4.6, 3 March 2003 (I downloaded precompiled windows

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