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    <div class="moz-cite-prefix">Hi Alexandre,<br>
      <br>
      this is a bit explained in:<br>
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      <a
        href="https://github.com/graphhopper/graphhopper/wiki/Developers">https://github.com/graphhopper/graphhopper/wiki/Developers</a><br>
      <br>
      barriers are just OSM barriers. tower nodes are the nodes which
      will end up in the graph and which are necessary for routing.
      pillar nodes are nodes which have only a degree of 2 and are only
      necessary to calculate distance and for proper displaying of the
      final route. Those nodes end up in the wayGeometry only. This
      separation speeds up routing, reduces import time and reduces
      graph storage size. But causes some problems which will be finally
      solved in the next release: <br>
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      <a href="https://github.com/graphhopper/graphhopper/issues/27">https://github.com/graphhopper/graphhopper/issues/27</a><br>
      <br>
      Regards,<br>
      Peter.<br>
      <br>
      <br>
    </div>
    <blockquote
cite="mid:CAC0z2bSFSsOqu_WN6-SxaYY3VO9qQXLcMKdXhcP3du4g01dMVQ@mail.gmail.com"
      type="cite">
      <div dir="ltr"><span
          style="font-family:arial,sans-serif;font-size:12.800000190734863px">hi
          all</span>
        <div
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        </div>
        <div
          style="font-family:arial,sans-serif;font-size:12.800000190734863px">
          thanks for the creator of graphhopper for this awesome work.</div>
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        </div>
        <div
          style="font-family:arial,sans-serif;font-size:12.800000190734863px">
          I am just beging to dig in Graphhopper'code and I would like
          to know if there is a description of the graph schema (what
          are the edges and the nodes towards osm objects?). I get a bit
          confused by TowerNodes, Barriers, Pillar Nodes etc).</div>
        <div
          style="font-family:arial,sans-serif;font-size:12.800000190734863px">Thanks
          in advance</div>
        <div><br>
        </div>
        -- <br>
        <div dir="ltr"><span style="color:rgb(136,136,136)">-- </span><br
            style="color:rgb(136,136,136)">
          <div dir="ltr" style="color:rgb(136,136,136)">
            <div>
              <div style="font-size:small;font-family:arial">Dr
                Alexandre Vallette, PhD</div>
            </div>
            <div style="font-size:small;font-family:arial">co-founder</div>
            <br style="font-size:small;font-family:arial">
            <span style="font-size:small;font-family:arial">+ 33 (0) 6
              71358943</span><br
              style="font-size:small;font-family:arial">
            <font><a moz-do-not-send="true"
                href="mailto:alexandre.vallette@snips.net"
                style="color:rgb(17,85,204)" target="_blank">alexandre.vallette@snips.net</a></font><br
              style="font-size:small;font-family:arial">
            <span style="font-size:small;font-family:arial">skype:
              vallettea</span></div>
          <div dir="ltr" style="color:rgb(136,136,136)">linkedIn: <a
              moz-do-not-send="true"
              href="http://fr.linkedin.com/in/vallettea/" title="View
              public profile" name="SafeHtmlFilter_webProfileURL"
              style="margin:0px 10px 0px 0px;padding:0px 0px 0px
              19px;border:0px;outline:0px;font-size:11px;font-family:Helvetica,Arial,sans-serif;vertical-align:middle;text-decoration:none;color:rgb(0,115,178);line-height:13.1875px;display:inline-block;zoom:1;background-image:url(http://s.c.lnkd.licdn.com/scds/common/u/images/apps/profile/sprite/sprite_profile_top_card_v7.png);background-color:rgb(246,246,246);background-repeat:no-repeat
              no-repeat" target="_blank">fr.linkedin.com/in/vallettea/</a><br
              style="font-size:small;font-family:arial">
            <span style="font-size:small;font-family:arial">twitter:
              @vallettea</span><br>
          </div>
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      <pre wrap="">_______________________________________________
GraphHopper mailing list
<a class="moz-txt-link-abbreviated" href="mailto:GraphHopper@openstreetmap.org">GraphHopper@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="http://lists.openstreetmap.org/listinfo/graphhopper">http://lists.openstreetmap.org/listinfo/graphhopper</a>
</pre>
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