Hello. I've received some data in WGS66 CoordSys, and can't find any model to transform it to WGS84. How can I do it?
Sorry, I should have been more clear. In the Create Custom Geographic Transformation tool, use the geocentric translation method, leave the parameters set to zeroes. It doesn't matter whether the source/target geogcs is WGS66 or WGS84. We'll apply it correctly.
Not sure if this will give you what you need, but I found this on a quick web search:
AGD66 to WGS 84 (16)
(note: Google seems to correlate WGS66 with AGD66, which may or may not be correct).
Some general information (but not the specific transformation):
World Geodetic System - Wikipedia, the free encyclopedia
Edit: added more info
Chris Donohue, GISP
I don't think they're the same. That is, there's definitely a World Geodetic System 1966 as well as Australian Geodetic Datum 1966. According to Wikipedia and ICSM, the ellipsoids are different too.
I don't think I've ever seen any transformations for WGS66. Possibly just define a custom one, but leave the parameters set to zeroes. That will model the difference between the flattenings of the two ellipsoids (so latitude values will change) but that's it.
Melita, you mean define a transformation changing only the ellipsoid, is that it?
Yes, that's right, because we have no information on how the two ellipsoids (datums) are oriented relative to each other.
Sorry for bothering you guys again... I can't find a way to do it in ArcCatalog. I see the different methods (Geocentric Translation, Molodensky, etc) but have no idea of what to use. I have the numbers though for both ellipsoids (flattening and semimajor axis), but don't really know what to do with them...
Thanks for your help, Melita, and again, sorry for asking a perhaps uneducated question. I just can't find the answers anywhere I looked for.
Now it's clear, even your previous response seems clear now.
I was thinking about entering the ellipsoid parameters, but now I got it: ESRI already knows them. Just need to apply them in the transformation method with zeroes for the other parameters.
Makes total sense.
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