[talk-au] Way errors in Quilpie Qld

[Bob Cameron]

Thanks Andrew, looks excellent.

I did record 2 full GPX tracks for all streets. Would you like me to 
send them to you at your gmail acct for a cross check?

I also covered the laneway and access to the railway station from the 
Brolga Street side and Murana Road on the other. I have dashcam imagery 
for the whole route as well. (Which I will use to fix site/name 
buildings and businesses) Shout if you need any of these.

Cheers Bob

On 3/10/21 12:58 pm, Andrew Davidson wrote:
> On Sat, Oct 2, 2021 at 10:46 PM Thorsten Engler via Talk-au
> <talk-au at openstreetmap.org> wrote:
>> I would assume that the lot boundaries recorded in DCDB are "exact" and any
>> discrepancy between them and the physical world come down to the margin of
>> errors the surveyors did when placing boundary pegs at some point.
> I tried to check against any survey marks that you might be able to
> locate on the imagery. Unfortunately there are no survey marks in
> Quilpie from the GNSS era of surveying. I did manage to find one near
> town that you can just make out where it would be on Bing:
>
> https://qspatial.information.qld.gov.au/SurveyReport/SCR183342.pdf
>
>> Bing is almost right: -0.15; 1.79
> I get -0.10;1.50 which, considering that we are looking at aerial
> imagery with a pixel size of ~0.15m, is the same thing. This is all
> based on GDA94, so in theory all of the GPX traces will be offset by
> about 1.63 m
>
> I have done a best-fit and moved the town about 11 m to the west.
> There are some things (e.g. the rail line near the sale yards) that
> need to be better traced. I will have a look at these later.
>
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