----- 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