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

Franc Carter franc.carter at gmail.com
Mon Sep 24 00:39:33 BST 2007

On 9/24/07, Ian Sergeant <isergean at hih.com.au> wrote:
> "Franc Carter" <franc.carter at gmail.com> wrote on 22/09/2007 11:54:32 AM:
> > Looks like my gps (tomtom-910) wants to hide info from me ;-(
> > A 3 minute trace log standing still in the domain produced exactly
> > the same lat/lon for every point.
> > Next thing I might try is to drive around as many of the roads on
> > the border of
> > the CBD as feasible to get some boundaries.
> Is the tomtom locking to the road/path?  Are you using the standard tomtom
> software?

I don't think so - I am using NMEAlogger which as far as I can see is logging
the raw NMEA.

> Is it a PDA that will run something that will let you gather the NMEA data,
> to get the accuracy and the location data?
> I gathered a 5 minute sample at 5m accuracy for the Maquarie Obelisk in
> Macquarie Place last week.  I figured it would be a good point to start
> with, since I can put it into OSM as a survey mark.  However, I just
> checked the Yahoo Imagery, and you can't see the obelisk, as it is
> obscured.  I'll upload it into OSM, but its otherwise useless I think.

Bummer ;-(

> There is  still a possibility that the yahoo image is actually a little
> distorted, and can't be normalised just with a nudge.

Yes, I was wondering about this

> I think the waterline along west Circular Quay could be my next target.  I
> can accurately map the waterline, and it should align well with the Yahoo
> imagery in that part of the city.

Good idea


> Ian.


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