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    <div class="moz-cite-prefix">On 2019-03-13 15:44, Sergio Manzi
      wrote:<br>
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      <div class="moz-cite-prefix">On 2019-03-13 15:27, Mateusz
        Konieczny wrote:<br>
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        <div style="16px" text-align="left">Mar 13, 2019, 12:53 PM by <a
            class="moz-txt-link-abbreviated" href="mailto:smz@smz.it"
            moz-do-not-send="true">smz@smz.it</a>:<br>
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          <div class="">On 2019-03-13 12:15, Tom Pfeifer wrote:<br>
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          <blockquote type="cite">I think you misunderstand. OSM is
            based on locally sourced, handcrafted data. That creates the
            high quality. <br>
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          <p>That's totally inaccurate.<br>
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          <p>The reality is that OSM is based on imported data,
            augmented by locally sourced information (<i>of </i><i><i>sometimes
              </i>questionable quality</i>).<br>
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          <p>Sergio<br>
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        <div style="16px" text-align="left">[citation needed]<br>
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        <div style="16px" text-align="left">It may be true in some rare
          regions, in many cases real mapping requires deletion of
          substandard<br>
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        <div style="16px" text-align="left">imports dumped into OSM (see
          TIGER mess in USA, low quality landcover in Slovakia making <br>
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        <div style="16px" text-align="left">mapping a horrible
          experience).<br>
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        <div style="16px" text-align="left">Describing OSM as "imported
          data, augmented by" is as far as I known complete
          misrepresenting the<br>
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        <div style="16px" text-align="left">situation.</div>
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      <p>I haven't said that OSM *is* imported data, but that it is
        *based on* imported data: that's different. And I never said
        that the "augmentation" contributed by mappers is of irrelevant
        importance (<i>even if sometime the quality is sub-par</i>).<br>
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      <p>Have mappers walked along the whole world coastlines? Have they
        descended all world's rivers by canoe? Have all Mumbay, New
        York, Rome, Shanghai, etc., streets and alleys been walked by
        volunteers mapping their location and names? All the peaks
        escalated?</p>
      <p>Sergio<br>
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    <p>... an example of massively imported data (<i>which I agree with,
        btw...</i>):
<a class="moz-txt-link-freetext" href="https://blogs.bing.com/maps/2018-06/microsoft-releases-125-million-building-footprints-in-the-us-as-open-data">https://blogs.bing.com/maps/2018-06/microsoft-releases-125-million-building-footprints-in-the-us-as-open-data</a><br>
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