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Projecting point shapefile between northern and southern hemispheres in ArcMap9.3

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09-07-2011 11:06 PM
seanblake
Emerging Contributor
Hi all
I have a point shapefile in WGS84 UTM Zone 55S. I am trying to project it to WGS UTM Zone 55N so I can calculate the corresponding E/N values. For some reason when I go through the process of projecting the view to WGS84 UTM Zone 55N my eastings look fine (ie the same as for the S) but my northings are negative values. As all the literature states there should be no -ve values in UTM. I'm not sure what is happening?
I'm also trying to project a .tiff from the N to the S hemisphere and can't do that either.
Anyone had experience of this??
Cheers
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2 Replies
MelitaKennedy
Esri Notable Contributor
Hi,

You're getting the right coordinates. Northern hemisphere UTM zones have a Y/northing origin at the equator so any data below there will have negative Y values. Southern hemisphere UTM zones have a Y origin at the equator too, but add a false northing of 10000000 m. That means all Y coordinates in the southern hemisphere will be positive. Points above the equator will have Y values larger than 10 million meters.

Melita
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seanblake
Emerging Contributor
Thanks for that Melita!
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