What is the correct Longitude of origin for UTM zones 32V, 31/33/35/37X ?

[brenor...@gmail.com]

There are 5 UTM zones around Norway that are wider then the standard 6
degrees of longitude. In order to convert between UTM coordinates and
Lat/Long within these zones it is necessary to know the Longitude of
Origin. For standard UTM zones its always the central meridian of the
zone, you can calculate it pretty easily with the formula:

Long_of_Origin = (UTM_Zone_Number - 1)*6 - 180 + 3

However, for 3 (32V, 31X & 37X) of the 5 non-standard zones the
formula result is not the central meridian.

32V: 3 ~ 12, central meridian = 7.5, calculated Longitude of Origin 9
31X: 0 ~ 9, central meridian = 4.5, calculated Longitude of Origin 3
33X: 9 ~ 21, OK, both 15
35X: 21 ~ 33, OK both 27
37X: 33 ~ 42, central meridian = 37.5, calculated Longitude of Origin
39

Every online piece of code I can find uses the formula. I can't find
anything definitive that says this is correct. Can anyone please
confirm this or at least point me in the right direction to find an
answer.

Thanks,
Brenor

[bob]

In message
<09d8dfe5-bedf-43c5...@u10g2000prn.googlegroups.com>,
brenor...@gmail.com writes

Gosh, every day a school day. I had no idea that UTM zones were anything
other than 6deg strips. Sure enough everywhere except Norway as I've
found mentioned at
http://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_sys
tem

I'm afraid I can't help you Brenor but I thank-you for educating me
today.

Cheers
--
geomannie

[Chuck Taylor]

On Thu, 20 Mar 2008 11:12:47 -0700 (PDT), brenor...@gmail.com
wrote:

There's a little bit of description in paragraph 3-2.2.1 of TM 8358.1.
<URL:http://earth-info.nga.mil/GandG/publications/tm8358.1/toc.html>

For these widened zones, use the central meridian for the zone at its
normal width.

--
Chuck Taylor
http://home.hiwaay.net/~taylorc/contact/

[brenor...@gmail.com]

On Mar 20, 6:04 pm, Chuck Taylor <chuck.tay...@spamtrap.org> wrote:
> On Thu, 20 Mar 2008 11:12:47 -0700 (PDT), brenor.bro...@gmail.com

Thanks Chuck.