jmoroney

WGS84 to GDA94 conversion

Discussion created by jmoroney on Sep 28, 2010
Latest reply on Sep 29, 2010 by MKennedy-esristaff
I am importing GPS data into ArcInfo from a .csv file using Make XY Event Layer.  I then convert this to a feature class in a File Geodatabase. 

The coordinates have been collected using WGS84.  When I input the Spatial Reference details I select Geographic Coordinate Systems > World > WGS 94.prj.

I then attempt to Project to GDA94 - specifying the Output Coordinate System to be Geographic Coordinate Systems > Australia and New Zealand > Geocentric Datum of Australia 1994.prj

It then requires a Geographic Transformation and only offers GDA_1994_To_WGS_1984 - I actually want the reverse.

The result is the points have exactly the same coordinates (to the 8th decimapl place) and positions.  I believe there should be a small shift in coordinates if the projection was working correctly.

Any assistance would be greatly appreciated.

John

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