[talk-au] Snapping Major regional roads to GPS traces

[Simon Poole]

Am 16.05.2021 um 10:51 schrieb Sebastian S.:
> I recall they Strava heat map, have they fixed the resolution issue?

The "resolution issue" is on purpose (goes back to the scandal with the 
US armed forces) and the hacks around it are at best tolerated by Strava.

In any case you can use lots of sources for alignment, including 
government maps if available on a suitable licence.

Simon

> Last time I've tried to use it the high resolution or the heatmap 
> required Strava log in and JOSM was not able to do that.
>
> On 16 May 2021 6:05:16 pm AEST, Little Maps <mapslittle at gmail.com> wrote:
>
>     Hi all, there’s a good primer on how to use the image offset
>     database in JOSM here…
>
>     https://learnosm.org/en/josm/correcting-imagery-offset/
>     <https://learnosm.org/en/josm/correcting-imagery-offset/>
>
>     Bob, I doubt that the existing offset database will help you in
>     central Qld, as there probably aren’t enough mappers who have used
>     it in that region. I’ve tried to use the database in south-central
>     NSW and I’ve never come across a saved offset for any imagery. If
>     you don’t have an accurate base map like the NSW base map
>     available, then, in the absence of any absolute measure of
>     location accuracy, it’s difficult to know which imagery is best
>     aligned, so you can’t really move the imagery and then upload the
>     offset as you don’t know how good it really is. Vicious circle.
>
>     I’ve found the Strava heat map a really useful overlay for
>     aligning imagery as the number of users (and hence traces) can
>     often be orders of magnitudes greater than that in the OSM gpx
>     collection. To clarify, I don’t use it to map anything but instead
>     use it to align the available imagery and then map from the
>     imagery. But, once again, in very remote areas even this source
>     may not provide much useful data.
>
>     Cheers Ian
>
>
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