[OSRS-PROJ] Pseudo X/Y values, forward and reverse
Ed McNierney
ed at topozone.com
Wed Jan 29 19:13:47 EST 2003
Willy -
Can you provide us with the numbers you're using in your sample?
Are you correctly interpreting and re-entering the lat/lon values? It
sounds like you could be getting (for example) output lat/lon in degrees
and decimal minutes which is being input as degrees/minutes/seconds.
- Ed
Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA 01863
Phone: (978) 251-4242 Fax: (978) 251-1396
ed at topozone.com
-----Original Message-----
From: William Hersman [mailto:Willy.Hersman at conocophillips.com]
Sent: Wednesday, January 29, 2003 6:07 PM
To: osrs-proj at remotesensing.org
Subject: [OSRS-PROJ] Pseudo X/Y values, forward and reverse
We are struggling with the following problem. Perhaps someone could
comment.
Alaska has 10 Stateplane zones. Let's say a point exists in zone 10 and
we
want the pseudo x/y for zone 4. On forward projection the given
lat/long
returns x/y values calculated for zone 4. When one then re-inputs the
x/y
values into the algorithm to get a lat/long, the inverse does not return
to
the same point. In fact, in terms of feet, it is nearly a mile off !
What
might be going wrong here, and should one expect to be able to
"round-trip"
a point when junmping across zones?
Thanks,
Willy Hersman
ConocoPhillips, Alaska
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