----- Forwarded Message -----
From: "Greg March" <[log in to unmask]>
To: "Air Photo Maps, GIS Forum - Map Librarianship" <[log in to unmask]>
Sent: Saturday, May 1, 2010 7:25:22 AM GMT -06:00 US/Canada Central
Subject: FW: Offset UTM - National Grid?
Hi Everyone,
I should have remembered about the shift between NAD27 and NAD83. I've seen
that information on the map collars for years now, and I didn't put two and
two together. Maybe it's time for a vacation. Larry Moore's email is below
for more info. I apologize for the mistake.
-Greg
------ Forwarded Message
From: Greg <[log in to unmask]>
Date: Sat, 01 May 2010 08:20:18 -0400
To: Laurence R Moore <[log in to unmask]>
Conversation: Offset UTM - National Grid?
Subject: Re: Offset UTM - National Grid?
Mr. Moore,
I'm an idiot. I've seen that information on the map collar for years. I
should have caught that.
Thank you,
-Greg
On 4/30/10 3:52 PM, "Laurence R Moore" <[log in to unmask]> wrote:
> error in your email address on first send...
>
> ----- Forwarded by Laurence R Moore/GEOG/USGS/DOI on 04/30/2010 02:52 PM
> -----
>
> From:
> Laurence R Moore/GEOG/USGS/DOI
> To:
> USTOPO/USGS/DOI@USGS
> Cc:
> [log in to unmask], Michael J Cooley/GEOG/USGS/DOI@USGS, Stafford G
> Binder/GEOG/USGS/DOI@USGS
> Date:
> 04/30/2010 02:51 PM
> Subject:
> Re: Offset UTM - National Grid?
>
>
> The overwhelming majority of the original topo maps, including Wolf Creek
> Dam, are published on the NAD27 datum, so UTM grids and coordinate values
> will not match. The UTM grid shift between NAD27 and NAD83 for most of
> CONUS is around 200-220 meters, almost all of it in the N-S direction. See
> http://www.geog.ubc.ca/courses/geob370/notes/background_docs/dataum_shifts.pdf
> for more detail.
>
> -----------------------------
> Larry Moore
> US Geological Survey
> [log in to unmask]
> 303-202-4019 office
> 720-237-6779 mobile
>
>
>
>
> From:
> USTOPO/USGS/DOI
> To:
> Laurence R Moore/GEOG/USGS/DOI@USGS
> Cc:
> Michael J Cooley/GEOG/USGS/DOI@USGS, [log in to unmask]
> Date:
> 04/30/2010 02:13 PM
> Subject:
> Offset UTM - National Grid?
> Sent by:
> Stafford G Binder
>
>
> Larry, I am not going to check this as we have see this before.
> Larry, please check Lexington West, KY; Olmstead, ILL/KY; Wolf Creek Dam,
> KY which were also found suspect by Greg.
> Please check these grids and see if you can determine was caused this and
> how wide-spread the problem might be.
> Stafford
> ----- Forwarded by Stafford G Binder/GEOG/USGS/DOI on 04/30/2010 01:08 PM
> -----
>
> From:
> "March, Greg" <[log in to unmask]>
> To:
> "USTOPO" <[log in to unmask]>
> Date:
> 04/30/2010 10:40 AM
> Subject:
> RE: USGS US Topo Printing
>
>
>
> Hi Stafford,
>
> I overlaid the 2010 Wolf Creek Dam US Topo on top of a DRG of Wolf Creek
> Dam in ArcMap and the UTM northing grid ticks don?t line up with one
> another.
>
> -Greg
>
> Gregory H. March
> Assistant Professor, Map/GIS Librarian
> University of Tennessee
> Map Services
> G21A Hodges Library
> Knoxville, TN 37996
> 865-974-3878 (phone)
> 865-974-3925 (fax)
> [log in to unmask]
> http://www.lib.utk.edu/people/march.html
>
>
>
>
>
>
>
>
>
------ End of Forwarded Message
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