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<div class="moz-cite-prefix"><i>>"I don't understand why it is
being claimed that facebook ... is not using Openstreetmap
data."</i><br>
</div>
<div class="moz-cite-prefix"> The original claim was not about
facebook "using" OSM data, it was that a specific dataset was
"derived" from OSM data. To use the cooking analogy, a cake is
derived from flour, oil, sugar, etc. It is not derived from
spoons, bowls, pans or flour-sifters. In this case, OSM data was
used as a sifter to decide which of their data to subtract from
their data. <br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"> <i>>"I can create a polygon data
set of the Earth surface (a simple rectangle in EPSG:4326) and
subtract an OSM derived data set of the Earth land masses from
that to get a data set of the oceans."</i></div>
<div class="moz-cite-prefix"> This might make sense in autocad
which has cutting operations, but makes no sense in OSM. The
operation described would require <b>adding</b> all lines
tagged in OSM as "natural=coastline" to your dataset. Facebook
is not inferring the shape of their streets based on OSM data. <br>
</div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">As far as the licensing, it appears
to me to only apply to the software (RapiD) not the data. But it
should be more explicit.<br>
</div>
<div class="moz-cite-prefix"><a
href="https://github.com/facebookmicrosites/Open-Mapping-At-Facebook">https://github.com/facebookmicrosites/Open-Mapping-At-Facebook</a></div>
<div class="moz-cite-prefix"><a
href="https://github.com/facebookmicrosites/Open-Mapping-At-Facebook/blob/master/LICENSE.md">https://github.com/facebookmicrosites/Open-Mapping-At-Facebook/blob/master/LICENSE.md</a></div>
<div class="moz-cite-prefix">The license summary says that it only
requires preservation of copyright and license notices.<span
style="color: rgb(88, 96, 105); font-family: -apple-system,
BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
sans-serif, "Apple Color Emoji", "Segoe UI
Emoji"; font-size: 12px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps: normal;
font-weight: 400; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color: rgb(255,
255, 255); text-decoration-style: initial;
text-decoration-color: initial; display: inline !important;
float: none;"></span></div>
<p><a
href="https://github.com/facebookmicrosites/Open-Mapping-At-Facebook/wiki/FAQ">https://github.com/facebookmicrosites/Open-Mapping-At-Facebook/wiki/FAQ</a></p>
<p>The real question should be: When the RapiD software is used to
add their street data to OSM does it tag the street with
copyright and license notices?</p>
<p>For the record, I do not like facebook. I have never had a
facebook account and never will.</p>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 11/15/2019 8:03 AM, Nuno Caldeira
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAK5cRsrLyttsmXaqSV5V8V-mdhGqJRqFok93zBq05+mFb=mSug@mail.gmail.com">
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<div><span style="font-family:sans-serif">Well it's quite
obvious to me that for adding or subtracting you need OSM
data, so I have no doubts. it's like a cook recipe, if you
don't have use it, you won't get the end result without it,
adding or subtracting. </span><br
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<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 15 Nov 2019, 11:41
Christoph Hormann, <<a href="mailto:osm@imagico.de"
moz-do-not-send="true">osm@imagico.de</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
This realization (of there being no fundamental difference
between <br>
subtracting and adding) is - as Rory already explained -
not dependent <br>
on specific details of the ODbL or the law but derives
from elementary <br>
logic.<br>
<br>
-- <br>
Christoph Hormann<br>
<a href="http://www.imagico.de/" rel="noreferrer
noreferrer" target="_blank" moz-do-not-send="true">http://www.imagico.de/</a><br>
<br>
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