[Proj] Help translating NAD83 coordinates to WGS84
John D. Evans
jdevans at gst.com
Mon Sep 20 13:16:38 EDT 2004
Can someone point me to an authoritative, published (pref. online)
reference that states an upper bound on the difference between NAD83 and
WGS84 over North America?
I went looking for such a reference some time ago and the best I could
find was some NIMA or DMA Technical Report that said the two differed
"in some places by a meter or more".
Ed McNierney wrote,
>> In North America, NAD83 and WGS84 coordinates are so extremely
>> similar that no conversion is necessary or appropriate in most
>> cases. Unless your data is acquired with a precision of
>> millimeters (literally) you can treat the two datums as identical.
>> Most applications do that.
- John D. Evans, Ph.D. <jdevans at gst.com>
Global Science & Technology, Inc. (GST)
Geospatial Interoperability Group
1-240-542-1133 / 1-301-286-0803
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