whityn

Transformation issues between GCS WGS84 and GCS NAD83 using 10.2.1

Discussion created by whityn on Feb 4, 2014
Latest reply on Apr 11, 2014 by whityn
I've experienced some unexpected data shift when projecting between GCS WGS84 and GCS NAD83 using either the default ITRF00 transformation or the NAD_1983_To_WGS_1984_5 transformation. I'm aware that the difference between the same coordinates in each Datum will be up to ~2m on the ground in CONUS.

However, the transformation is consistently NOT applied at all when following the steps described below, even though it is selected from the Transformation drop down list in the Project tool.

Can anyone either confirm my results or point out my error?

Test (Revised):

Start with a point shapefile in GCS WGS84
Delete the .prj file
Use Define Projection tool to redefine to GCS WGS84 in 10.2.1

Add fields (Text, 20char) "Orig_X" and "Orig_Y"
In ArcMap, open table >> Calculate Geometry for each field to retrieve starting coordinates
Close ArcMap

Using Catalog - Toolbox >> Project the shapefile to GCS NAD83 using the default ITRF00 transformation

Add fields (Text, 20char) "GCSn83_X" and "GCSn83_Y" to the new NAD83 dataset
In ArcMap, open table >> Calculate Geometry for each field to retrieve transformed NAD83 coords
In my tests, these values match the Orig_X and Orig_Y coords exactly; i.e. not transformed




Thanks.

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