On 1 September 2012 11:35, Russell Edwards russell...@gmail.com wrote:
I am still curious to know what the positional accuracy of survey markers
is meant to be, if anyone can enlighten.
First question you have to ask is how old the survey is? Australia as a
whole moves north about 7-8 cm a
On 01/09/2012, at 16:58, Stephen Hope slh...@gmail.com wrote:
On 1 September 2012 11:35, Russell Edwards russell...@gmail.com wrote:
I am still curious to know what the positional accuracy of survey markers is
meant to be, if anyone can enlighten.
First question you have to ask is
But an even bigger error can be caused by using different projections. I
forget which one OSM uses, but using different projections can move a given
point 20m quite easily, and a survey marker may well be on a different one.
Can we get a definitive answer on this?
I think the terminology is
GDA94 to WGS84 is approx 45 cm from what I read but it will be affected by
continental drift. GDA is fixed to points on the Australian plate so GDA
coordinates will not change (much) but I guess OSM is really meant to be in
WGS84.
Just an update to this thread in case anyone is interested, I
On 02/09/12 10:14, Russell Edwards wrote:
GDA94 to WGS84 is approx 45 cm from what I read but it will be affected
by continental drift. GDA is fixed to points on the Australian plate so
GDA coordinates will not change (much) but I guess OSM is really meant
to be in WGS84.
Just an update to this
On 02/09/12 12:46, 4x4falcon wrote:
It's interesting that the traces from nearmap are misaligned as I said
previously their guarantee was that the accuracy was within 1m.
Not so interesting since we aren't using nearmap any longer, and many of
the nearmap traced ways have had their accuracy
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