<div dir="ltr">I intend to take a spin around the linked roundabouts this evening and try to capture a trace or two...<div><br></div><div>Regards,</div><div><i>Paul</i></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 13 Feb 2019 at 21:00, Warin <<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 14/02/19 03:42, Ed Loach wrote:<br>
> Paul wrote:<br>
><br>
>> Jerry,<br>
>><br>
>> No worries. I think I'll still pop down for a survey anyway because I now want to<br>
>> try the GPS + car trick and see how it turns out. We'll compare changesets later :)<br>
> Much of Clacton was originally mapped using that method, when there was no imagery covering the area.<br>
> <a href="https://www.openstreetmap.org/user/EdLoach/traces/page/79" rel="noreferrer" target="_blank">https://www.openstreetmap.org/user/EdLoach/traces/page/79</a><br>
> When imagery and OS opendata became available it was usually pretty close. I was using (and still use) a Locosys GT-31.<br>
><br>
> I have seen areas where the uploaded traces and the OSM roads seem to follow the pavement in the imagery and suspect it was mapped by a walker who hadn't adjusted for not walking down the middle of the road (I'm not talking a constant offset here as it depended which side of the roads they were walking).<br>
<br>
Same applies for car traces. Best to average multiple trips in both directions.<br>
<br>
><br>
> Accuracy will depend on the receiver and signal reception.<br>
<br>
Yep. Multiple trips can help with everything but reception problems caused by local obstructions (buildings, cliffs etc.<br>
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</blockquote></div>