It's interesting because it highlights one of the foundation myths of
OSM; which is that it uses the "WGS84" co-ordinate system. This is a
convenient myth and if you're talking about only mapping to the nearest
5m then it is in effect true. However, once you start talking about
sub-metre
On 8/2/2016 1:57 PM, Andrew Davidson wrote:
It's interesting because it highlights one of the foundation myths of
OSM; which is that it uses the "WGS84" co-ordinate system. This is a
convenient myth and if you're talking about only mapping to the
nearest 5m then it is in effect true. However,
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
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