[OSRS-PROJ] Bug in CEA projection?

[Gerald Evenden]

Local lproj (libproj4) script:

../lproj +proj=cea +ellps=WGS84 +lat_ts=30 -I -f '%.6f'<<EOF
0 7284713.234
EOF

Produces the following results:

0.000000	82.855347

Older versions of proj seem to have a problem.  Last change
to cea (libproj4) was Mar., '03

On Jan 28, 2004, at 6:00 AM, Orme, David wrote:

> Hi,
>
> This was cross-posted from the Grass list a while back - have I got
> something wrong or is this a bug?
>
> I'm using Proj 4.4.7 on my Mac 10.3.2 and ArcGIS 8 on a Windows XP
> machine - the two programs give different answers for coordinate
> transformations into  a Behrmann projection (Cylindrical Equal Area
> with latitude of true scale at 30 N/S). I've checked using Geotrans
> 2.2.4 on the Windows machine and that agrees with ArcGIS.
>
> My test point is in Behrmann coordinates, units in meters: 0E
> 7284713.234N
>
> cs2cs gives:
>
> > doibook:~/Library/Preferences dorme$ cs2cs -f "%0.6f" +proj=cea
> > +lat_ts=30 +datum=WGS84 +to +proj=latlong +datum=WGS84
> > 0 7284713.234
> > 0.000000        82.485563 0.000000
>
> Both ArcGIS and Geotrans give the following geodesic coordinates: 0 E
> 82.855347 N
>
> Any suggestions?
>
> Many thanks,
> David Orme
>
>
>
_____________________________________
Jerry and the low riders: Daisy Mae and Joshua
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