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<div class="moz-cite-prefix">Am 16.05.2021 um 10:51 schrieb
Sebastian S.:<br>
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<blockquote type="cite"
cite="mid:4908D829-9A43-47C3-86A8-E4F676DDE68B@consebt.de">
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I recall they Strava heat map, have they fixed the resolution
issue?<br>
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<p>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.<br>
</p>
<p>In any case you can use lots of sources for alignment, including
government maps if available on a suitable licence.</p>
<p>Simon<br>
</p>
<blockquote type="cite"
cite="mid:4908D829-9A43-47C3-86A8-E4F676DDE68B@consebt.de">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.<br>
<br>
<div class="gmail_quote">On 16 May 2021 6:05:16 pm AEST, Little
Maps <a class="moz-txt-link-rfc2396E" href="mailto:mapslittle@gmail.com"><mapslittle@gmail.com></a> wrote:
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div dir="ltr">Hi all, there’s a good primer on how to use the
image offset database in JOSM here…</div>
<div dir="ltr"><br>
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<div dir="ltr"><a
href="https://learnosm.org/en/josm/correcting-imagery-offset/"
moz-do-not-send="true">https://learnosm.org/en/josm/correcting-imagery-offset/</a></div>
<div dir="ltr"><br>
</div>
<div dir="ltr">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.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">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.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Cheers Ian</div>
<div dir="ltr"><br>
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