|
Decimal Degrees would imply that your map was
'unprojected' or rather in the plate carree projection. MapInfo would call this
Lat/Long and maybe WGS84.
However, it is very unlikely anyone would have ever
published a map in this form, so I suspect that Transverse Mercator is more like
it. In which case your co-ords would be metres in the projection counted from
the projection origin. This would normally be the intersection of the central
meridian and the equator, which would agree with your large y values. In most
cases map makers would use a false origin (i.e. an x and y shift or offset) in
order to make the co-ordinates on the map more
user-friendly.
regards
Tim
Dr Tim Rideout
Director
Visit XYZ at the Cape Town International Book Fair, June
2006, Frankfurt Book Fair, Oct 2006, Intergeo Munich Oct 2006 or IMTA World in
Singapore, Nov 2006
The XYZ Digital Map Company
Unit 9 Phase 2 Hardengreen Business
Park
Dalhousie Road
Dalkeith Scotland EH22 3NX
Tel +44 131 454 0426 Fax +44 131 454 0443 Mobile + 44 7766 825937 E-mail [EMAIL PROTECTED]
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ericson, Tim Sent: 09 March 2006 17:35 To: [email protected] 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 Project |
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