shrug-l: WGS84 vs NAD83 and data transformation

Brandt, Holli brandth at
Tue Jun 6 14:59:07 EDT 2006

Good Afternoon fellow SHRUGGIES:

Ok we recently received sub-centimeter GPS data in State Plane WGS84 (it was set up on the unit before they collected the data).  After I make it a shapefile and go to Define the shapefile, it seems that my only choice in ArcCatalog is State Plane NAD83.  I have read several posts on the web that state WGS84 and NAD83 are 'really close' and I can simply lie to ArcMap by choosing the State Plane NAD83 definition.  My concern is that I will be losing some resolution of my sub-centimeter data by lying to ArcMap.  

So here are all my questions:
Are WGS84 and NAD83 close enough?
Is there a way to define State Plane WGS84 in ArcCatalog?
Should I lie?
Any other suggestions?

Thanks - Holli

Holli M. Brandt
GIS Project Manager
EnVetCo, Inc.
520 S. Independence Blvd.
Suite 200
Virginia Beach, VA 23462
Office:  (757) 456-0028
Fax:  (757) 456-0399
Cell:  (757) 438-0058
hbrandt at 

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