[talk-au] Hi all ...

[Ross Scanlon]

>> The benefit I see is from law of averages, to a point, if you get 50
>> people tracing out the same ways, you average the points and neglect
>> any spurious data and you should have a very accurate plotting.

Yes but how many places have you seen with 50 traces there.  Additionally
if you are tracing the gps trace and not using the nodes from the gps
trace then you are introducing another error.  It's rare that these traces
are more than 5m apart anyway and most of that is operator induced eg
overtaking another vehicle, going arround a pothole in the road.

> Have to agree about 200% with Delta on this one, I've seen way too many
> cases of people who have obviously used their 1 gpx track to move and
> existing surveyed way to follow it when if they'd used theirs and the
> 20+ traces that were available on osm (and uploaded theirs so the next
> person would have 21+ to use) they'd realise their track was a off that
> day. I've also seen too many cases myself where I do a first trace
> down a road to get a path then put together 3 or 4 over a period of
> time and realise the first trace was off.

But as my first post said don't change anything that is tagged as
source=survey unless you have a really good reason, eg road has been
moved.

> The moral of the story is never ever ever use a GPS trace in isolation
> if there's any others available in the area, and make you traces
> available so the next person working in the area can benifit from your
> input also.

I guess it comes down to 99% of the ways I've mapped I've been the first
one there.

-- 
Cheers
Ross