[talk-au] Australia "changing coordinates"

[Andrew Davidson]

> WGS84 is a datum fixed; as in dated 1984 and the data does not change.

I'm not sure that you've understood exactly what a semi-dynamic datum 
is. Have a read of this:

http://ceur-ws.org/Vol-1142/paper6.pdf

particularly sections 3.4 and 3.5.


> Or you have access to survey points/marks and their data  in the local
> area.

LOL. Reminds me of this quote:


"You'll never find a survey mark on the ground with coordinates 
referenced to WGS-84. If you do, it's wrong."