<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.0.6249.1">
<TITLE>Bug in CEA projection?</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<P><FONT SIZE=2>Hi,<BR>
<BR>
This was cross-posted from the Grass list a while back - have I got<BR>
something wrong or is this a bug?<BR>
<BR>
I'm using Proj 4.4.7 on my Mac 10.3.2 and ArcGIS 8 on a Windows XP<BR>
machine - the two programs give different answers for coordinate<BR>
transformations into a Behrmann projection (Cylindrical Equal Area<BR>
with latitude of true scale at 30 N/S). I've checked using Geotrans<BR>
2.2.4 on the Windows machine and that agrees with ArcGIS.<BR>
<BR>
My test point is in Behrmann coordinates, units in meters: 0E<BR>
7284713.234N<BR>
<BR>
cs2cs gives:<BR>
<BR>
> doibook:~/Library/Preferences dorme$ cs2cs -f "%0.6f" +proj=cea<BR>
> +lat_ts=30 +datum=WGS84 +to +proj=latlong +datum=WGS84<BR>
> 0 7284713.234<BR>
> 0.000000 82.485563 0.000000<BR>
<BR>
Both ArcGIS and Geotrans give the following geodesic coordinates: 0 E<BR>
82.855347 N<BR>
<BR>
Any suggestions?<BR>
<BR>
Many thanks,<BR>
David Orme<BR>
<BR>
</FONT>
</P>
</BODY>
</HTML>