[talk-au] [OSM-talk] city accuracy

Franc Carter franc.carter at gmail.com
Mon Sep 17 01:40:24 BST 2007

Two places that I saw on the imagery last night, was a nice round paved
circle in
Hyde Park and an intersection of paths in the Domain - I'd expect both of
points would have fairly good accuracy. The other place that I just thought
of is
Darling Harbour - it should have some easily identifiable points.

I can't think of any points that in the real centre, unless I can find a
building where
there is public roof access.

I'm 'hoping' that points on the outskirts will be enough that aligning the
Yahoo Imagery
to them will result in the points derived from the are 'at least better'


On 9/17/07, Ian Sergeant <isergean at hih.com.au> wrote:
> "Franc Carter" <franc.carter at gmail.com> wrote on 17/09/2007 10:09:34 AM:
> > I agree the city is reasonably complete, there are several small
> > (tiny) lanes missing,
> > especially around the eastern side.
> Some of these are very hard to get right from Yahoo Imagery.  I just added
> all
> the Phillip Lane stuff around the back of Phillip St, and Farrar Place on
> Young Street.
> These were previously drawn as through ways, when there are bollards and
> various one way arrangements.
> > It's the accuracy that seems to be a bit out in
> > some places, i.e streets not being parallel and such. So 'something'
> > is out because the traces are bad it's difficult to decide which are the
> good ones
> > and hence fix it become a consistent accure whole.
> > I was thinking of getting some more accurate points from GPS averaging
> and then
> > working from them and the Yahoo Imagery.
> It can't hurt..  There are parts of the city where GPS traces are never
> going to work.
> > If you have some accurate points, I think it would be great to put
> > them in to OSM
> > and label them in some way.
> It is a shame that the GPX upload only seems to remember track points and
> not waypoints.
> I have labelled all the ways derived from GPS point averaging as
> source=survey.
> Are there any really accurate locations that you can find on the Yahoo
> Imagery?  I could get good references for those and put them on the Sydney
> Wiki page as a base for CBD mapping?
> Ian.

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