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<div class="moz-cite-prefix">On 2019-03-13 19:04, Volker Schmidt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALQ-OR4b_B5_tJKN7kmq5bkoTnaNo4epUE9E7R6VM6qR+cxOEQ@mail.gmail.com">
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<div dir="ltr">On Wed, 13 Mar 2019 at 15:45, Sergio Manzi <<a
href="mailto:smz@smz.it" moz-do-not-send="true">smz@smz.it</a>>
wrote:<br>
<div class="gmail_quote">
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<div class="gmail-m_-1238826230792829217moz-cite-prefix">Have
mappers walked along the whole world coastlines? Have
they descended all world's rivers by canoe? </div>
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</blockquote>
<div>No, these are examples where imports make sense as these
are feature that change slowly (normally) <br>
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<div class="gmail-m_-1238826230792829217moz-cite-prefix">Have
all Mumbay, New York, Rome, Shanghai, etc., streets and
alleys been walked by volunteers mapping their location
and names? </div>
</div>
</blockquote>
<div>No, but many have been photographed and the photographs
are available with open license (Mapillary and
OpenStreetCam) and many raods have been recorded with GPX
tracks. This allows armchair mapping with high quality
results, where the mapper does not need to be the
photographer.</div>
<div><a
href="https://openstreetcam.org/map/@40.73919689890453,-73.96898232070473,13z"
moz-do-not-send="true">New York on OpenStreetCam</a>, <a
href="https://www.mapillary.com/app/?focus=map&lat=52.37459220767326&lng=4.898735500000043&z=11.451877849993338"
moz-do-not-send="true">Amsterdam on Mapillary</a></div>
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<div class="gmail-m_-1238826230792829217moz-cite-prefix">All
the peaks escalated? </div>
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</blockquote>
<div>Again classical data that change slowly, where imports
are justified.<br>
</div>
<div><br>
</div>
<div>But when you start importing trees or buildings or hotels
or petrol stations or shops or crops than you are importing
perishable data which are maintained outside OSM, and hence
need frequent updates, with the obvious cost that they need
to be updated in the external source database and in the OSM
database in synchronism.</div>
<div><br>
</div>
<div>Volker<br>
</div>
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</blockquote>
<p><br>
</p>
<p>Fair enough, Volker, I agree on all your points. But let's recap,
if you don't mind.</p>
<p>My objection was to Tom Pfeifer assertion "<i>I think you
misunderstand. OSM is <b>based </b><b>on locally sourced,
handcrafted data</b>. That creates the high quality.</i>"</p>
<p>To me "<i>based on</i>" means the bulk of data which constitues
OSM foundation.</p>
I also have to admit that as far as concern myself, I'm very much
more interested in what you call "<i>data that changes slowly</i>"
and I see that as the OSM foundation:
<ul>
<li>natural terrain with all its features like hills, mountains,
rivers and lakes, forests and land cover in general<br>
</li>
<li>man made features like highways, canals, buildings, bridges,
etc.</li>
<li>persistent and generally useful information like street
numbers</li>
</ul>
<p>The above, slowly changing information, is what I think represent
OSM "base" information, and I don't believe the bulk of the above
is "locally sourced, handcrafted data", but I'm ready to change my
mind if proved wrong.</p>
<p>I also think that, as you correctly pointed out, both me and
Peter, (<i>I guess...</i>)
forgot about "armchair mapping" which is neither "import" nor
"locally sourced" and probably represent a huge amount of data in
OSM.<br>
</p>
<p>----</p>
<p>As far as regards Giovanni's import, my position is that I'm
pretty sure that the work he has done is of high quality, probably
much better than many "locally sourced" information (<i>you
probably have an idea of the quantity of "locally sourced" crap
I see here in Venice, mainly self-defined hotels and B&B
which are... nothing... just the address of people renting their
rooms/apartment</i> and stick a name on it).</p>
<p>Personally I would be much happier if OSM would limit itself to
its "base layer" and let other data aggregators handle different
kind of information: if I want an Hotel or a room I can go to
Tripadvisor or to Airbnb (<i>not endorsing those </i><i><u>in any
way</u></i><i>, just an example...</i>), see if it accepts my
pet and my credit card and then use OSM to navigate to the
address.</p>
<p>Unhappily things are not like this and we are mapping hotels. In
this regard I strongly tend to trust Giovanni import much more
than the "locally sourced" data.</p>
<p>Cheers,</p>
<p>Sergio<br>
</p>
<p><br>
</p>
<p><br>
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<p><br>
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