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Projection - NAD27 to Nad83 Zone 13N

Question asked by meewasinvalley on Oct 19, 2012
Latest reply on Oct 19, 2012 by MKennedy-esristaff
Hello,

I have lots of shapefiles in NAD 1927 Zone 13N which I would like projected to NAD 1983 Zone 13N. I have been trying to change the projection of these shapefiles but find the newly projected shapefile (NAD 83) is in the same exact spot as the previous shapefile (NAD27). I do not understand why the points have not shifted. I feel like this is a simple matter but I am having no success at finding the answer. I should also mention I am using ArcMap 10.1.

In terms of my method of changing the projection, it is as follows: Start a new map. Change the Data Frame Properties coordinate system to NAD 1983 Zone 13N. Add the NAD27 shapefile. Right click on the shapefile and export the data in the data frames coordinate system. Add the new shapefile to the map. After I complete this I find that the two shapefiles (NAD27 and NAD83) are showing the points to be in the same spot even though the properties tab shows the projections to be different.

Do I need to apply a transformation? I have been trying to figure out how to apply the CNT transformation but am not sure how to enter its information (see below). How do I use a CNT transformation? Should I even be using this transformation?

INPUT
PROJECTION UTM
UNITS METERS
DATUM NAD27 CNT
ZONE 15
PARAMETERS
OUTPUT
PROJECTION UTM
UNITS METERS
DATUM NAD83 CNT
ZONE 15
PARAMETERS
END

Thank you in advance for your help.

Sincerely,
Sarina

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