[Mapserver-users] PROJ command line - lat/long to UTM zone 20

[Ed McNierney]

Debbie -

I'm not quite sure what you think the problem is.  Your two command lines are for two different coordinates (64.5 W and 65 W) so they naturally produce different results.  Lines of constant latitude are curves in the UTM projection, so two points with the same latitude but different longitudes will have different UTM Northing coordinates.  Both of those coordinate projections are giving you the correct results.

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 

-----Original Message-----
From: Debbie Pagurek [mailto:pagurekd at agr.gc.ca]
Sent: Wednesday, January 08, 2003 9:57 AM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] PROJ command line - lat/long to UTM zone 20


Hi everyone,
this isn't directly related to mapserver but it is because I'm trying to set up a world file for a jpeg image...

can someone give me some pointers on how to use the PROJ command line to convert a lat/long point to  UTM zone coordinates?

I have tried several things but keep getting different results e.g.
  proj +proj=utm +lon_0=-63  -E -r <<EOF
> 46.25N 64.5W
> EOF
46.25N 64.5W    384376.30       5122918.25

proj +proj=utm +lon_0=-63  -E -r <<EOF
> 46.25N 65W
> EOF
46.25N 65W      345835.64       5123768.85

How come the UTM coordinate for 46.25N changed?
What am I doing incorrectly?

If anyone could please tell me the correct way to use the PROJ command line for lat/long to UTM conversion, I'd really REALLY appreciate it!

Thanks,
D. Pagurek
p.s. using PROJ 4.4.5 on linux.


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