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Hello Tim,
The X an Y coordinates you included
appear to be valid values for a UTM system.
Those particular coordinates converted to
WGS84 Lat/Long would fall on:
N 35.364771°, W 105.450965°
Or about 25 miles southeast of Santa
Fe, New Mexico (that is, assuming those values
are meters). The USGS 7.5' Topo sheets
were drawn using UTM projected zones,
whatever the appropriate zone was for the
area. They usually have control points
listed on them given in degrees, despite
the map being projected in UTM, though the
degrees are typically given in Degrees Minutes
Seconds format. There are usually several
graticules drawn on those maps in different
coordinate reference systems (State Plane,
Lat/Long, and UTM), but from your XY coordinates
I would bet that it's actually referenced
using UTM zone 13. In which case, in
MapInfo the projection would be under "Universal
Transverse Mercator (NAD27 for US)" and "UTM
Zone 13 (NAD27 for US)". Doesn't look
like you are making a mistake to me, sounds
more like the FAQ has the error.
Regards, Sam Knight Applications Specialist Blue Marble Geographics [EMAIL PROTECTED] Ph: 800-616-2725 ext. 24 Ph: 207-582-6747 ext. 24 Fax: 207-582-7001 http://www.bluemarblegeo.com and http://www.beyondgeo.com ----------------------- Original
Message -----------------------
From: "Ericson, Tim" <[EMAIL PROTECTED]>
Date: Thu, 9 Mar 2006 10:35:24
-0700
Subject: [MI-L] Question
on Projection of TOPO 7.5 min Maps
I’m
trying to import TOPO maps (MRSid format)
into MapInfo. The sources FAQs say
that the projection is “Decimal Degrees”
– I’m not sure what that is telling
me – relative to the projection Options
in MI… The
metadata mentions UTM Zone 13 (NAD 27) When
I use that projection I get locations such
as X Cord
459,082.52 Y Cord
3,913,385.49 Which
really makes NO sense to me! I open the MRSid
into OpenEV and I get the same type of X
Y Cordinates. I’m
sure that I’m making a mistake somewhere!!!!
Have you any suggestion? Thanks! Tim
Ericson Network
Engineer Qwest
Communications On
loan to Harris Corp FAA Telecom Improvement
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