[Proj] Albers reprojection anomoly?

[Frank Warmerdam]

Gerald, or others,

In bug report:
  http://bugzilla.remotesensing.org/show_bug.cgi?id=877

a user reports that albers reprojection seems to not match what
he expects.  Based on his test datasets, I get:

input (+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 
          +x_0=0 +y_0=0 +ellps=clrk66 +units=m +no_defs):

  581715E, 1070148N

output (+proj=utm +zone=16 +datum=NAD27):
  239958E, 3602624N

output (expected for UTM 16 NAD27):
  239958E, 3602624N

As you can see the PROJ.4 translation seems to match well in
X but not in Y.  The user reports the expected information based
on reprojection with Global Mapper and ArcGIS.  

Can anyone comment on whether these values are in a region 
of reasonably validity for the UTM and Albers projection code?
Can anyone provide external verification one way or the other for
these albers to UTM conversions? 

Feel free to look into the bug report for details. 

Best regards,
-- 
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