Actually Evan, it will work. When you choose a different projection in Save
As, the actual coordinate values are changed to their proper values in the
new coordinate system. For example, a point at -122.668726 38.400478 in
NAD83 is at -122.667629 38.400565 in NAD 27.
Maybe if you explained your problem in a bit more detail we might be able to
offer more help. There really isn't any reason to convert between NAD83 and
NAD27 in MapInfo, since MI does the coordinate transformations on the fly.
If your two layers aren't lining up properly, it may be because one or other
of the files is in the wrong coordinate system. That problem can also be
fixed, without much added difficulty.
Since you're in Irvine, give me a ring if you want and I'll try and help you
sort it out.
Cheers,
Tim
_____________________________
Tim Warman
Geologist & GIS Specialist
Richard C. Slade & Associates
North Hollywood, CA
(818) 506-0418
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Macdougall,
Evan 1065
Sent: Tuesday, November 07, 2000 3:21 PM
To: [EMAIL PROTECTED]
Subject: RE: MI-L I need to translate NAD 83 coordinates into NAD 27 and/or
visa-versa
That wont work. That only changes the projection, not the actual
coordinates. The lat/long of a property in NAD 27 is different than the
lat/long of the same property in NAD 83. So, if you merely change the
projection, the lat/long doesn't change, which is what needs to happen.
When switching from NAD 27 to NAD 83, the lat/long needs to be
re-calculated.
The same effect is achieved if you open two files, one was created
with a NAD 83 projection and the other with a NAD 27 projection. If they
are overlayed, one of them will be changed temporarily to match the
projection of the other. However, the lat/longs don't change and the points
will still be offset. The actual lat/longs need to change, not just the way
they are displayed. That is what the translator program does.
-Evan
-----Original Message-----
From: John Haynes [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, November 07, 2000 3:04 PM
To: Macdougall, Evan 1065; [EMAIL PROTECTED]
Subject: Re: MI-L I need to translate NAD 83 coordinates into NAD 27
and/or visa-versa
MI-L I need to translate NAD 83 coordinates into NAD 27 and/or
visa-versaSave a copy of the table and check NAD 27 in the Projection box as
you save it.
John Haynes
Director
Geodata Consultants, Inc.
1-800-838-6661
www.geodataconsult.com
----- Original Message -----
From: Macdougall, Evan 1065
To: '[EMAIL PROTECTED]'
Sent: Tuesday, November 07, 2000 5:32 PM
Subject: MI-L I need to translate NAD 83 coordinates into NAD 27 and/or
visa-versa
Hey all,
I have Mapinfo flood zone and street data in NAD 27 coordinates,
but I have Zip+4 centroid files in NAD 83 coordinates. I need to be able to
convert one into the other, preferably taking the Zip+4 data and converting
it to NAD 27 because that involves the least amount of work. Where can I
get a program to convert the lat/long coordinates? Can I get one for free?
How much would a program cost to buy? etc. etc. Thank you all for you
help.
-Evan
<< File: ATT00001.htm >>
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