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<title>Open Street Maps — Usse 1 documentation</title>
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<p class="caption" role="heading"><span class="caption-text">Contents:</span></p>
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="funda.html">Scraping Funda</a></li>
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<li class="toctree-l1"><a class="reference internal" href="googlemaps.html">Google Maps API</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Open Street Maps</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#osrm">OSRM</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#setup">Setup</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#nominatim">Nominatim</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#ip-firewall">IP Firewall</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#tile-server">Tile Server</a></li>
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<section id="open-street-maps">
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<h1>Open Street Maps<a class="headerlink" href="#open-street-maps" title="Permalink to this heading"></a></h1>
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<p>Much like Google Maps, <code class="docutils literal notranslate"><span class="pre">Openstreetmaps</span></code> is a map that allows you to navigate the world.
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The main difference being that OSM is free and can be self hosted.
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However there is not a <em>plug-and-play</em> solution that will host your own maps.
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It turns out that hosting your own maps, including geolocation and calculating distances is quite a big task, especially if you want to suppor the whole world.</p>
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<section id="osrm">
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<h2>OSRM<a class="headerlink" href="#osrm" title="Permalink to this heading"></a></h2>
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<p><strong>O</strong>pen <strong>S</strong>ource <strong>R</strong>outing <strong>M</strong>achine (OSRM) is a project that allows you to calculate distances from a OSM map.
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See more about the project <a class="reference external" href="https://project-osrm.org/">here</a></p>
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<section id="setup">
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<h3>Setup<a class="headerlink" href="#setup" title="Permalink to this heading"></a></h3>
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<p>Setting OSRM up is straightforward, but it requires you to the same docker container several times. In short the commands for the Netherlands are as follows:</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">#</span>Download The Netherlands
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<span class="go">mkdir -p data/</span>
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<span class="go">cd data/</span>
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<span class="go">wget https://download.geofabrik.de/europe/netherlands-latest.osm.pbf</span>
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<span class="go">cd ../</span>
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<span class="go">docker run --name osrm-backend -t -v "${PWD}/data:/data" osrm/osrm-backend osrm-extract -p /opt/car.lua /data/netherlands-latest.osm.pbf</span>
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<span class="gp"># </span>Process the data
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<span class="go">docker run -a osrm-backend -t -v "${PWD}/data:/data" osrm/osrm-backend osrm-contract /data/netherlands-latest.osrm</span>
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<span class="go">docker run -t -v "${PWD}/data:/data" osrm/osrm-backend osrm-partition /data/netherlands-latest.osrm</span>
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<span class="go">docker run -t -v "${PWD}/data:/data" osrm/osrm-backend osrm-customize /data/netherlands-latest.osrm</span>
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<span class="gp"># </span>Finaly run the routing engine
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<span class="go">docker run -t -i -p 5998:5000 -v "${PWD}/data:/data" osrm/osrm-backend osrm-routed --algorithm mld /data/netherlands-latest.osrm</span>
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</pre></div>
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</div>
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<p>Now you can use curl to do requests to port <code class="docutils literal notranslate"><span class="pre">5998</span></code>.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>When using Google Maps coordinates to send requests to OSRM, make sure that the Longitude and Latitude coordinates are not swapped.</p>
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</div>
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</section>
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</section>
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<section id="nominatim">
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<h2>Nominatim<a class="headerlink" href="#nominatim" title="Permalink to this heading"></a></h2>
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<p>As it turns out, <code class="docutils literal notranslate"><span class="pre">OSRM</span></code> is a very good routing engine but it can’t do geolocation. To solve this <code class="docutils literal notranslate"><span class="pre">Nominatim</span></code> was used to resolve postal codes to coordinates.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>cat run_nominatim.sh
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<span class="gp">#</span>! /bin/bash
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<span class="go">docker run -it \</span>
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<span class="go">-e PBF_PATH=/nominatim/data/netherlands-latest.osm.pbf \</span>
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<span class="go">-v "${PWD}/data:/nominatim/data" \</span>
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<span class="go">-e REPLICATION_URL=https://download.geofabrik.de/europe/netherlands-updates/ \</span>
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<span class="go">-p 5999:8080 \</span>
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<span class="go">--name nominatim \</span>
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<span class="go">mediagis/nominatim:4.2</span>
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</pre></div>
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</div>
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<p>This will result in a website that is accessible on port 5999 to which you can send queries.</p>
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</section>
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<section id="ip-firewall">
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<h2>IP Firewall<a class="headerlink" href="#ip-firewall" title="Permalink to this heading"></a></h2>
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<p>Procesing routing data is hard.
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In order to prevent bots from misusing these interfaces a firewall rule was added to only allow incomming traffic from specific ip addresses.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>sudo ufw allow from <ip_addr> to any port <span class="m">5998</span>
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<span class="gp">$ </span>sudo ufw allow from <ip_addr> to any port <span class="m">5999</span>
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</pre></div>
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</div>
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</section>
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<section id="tile-server">
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<h2>Tile Server<a class="headerlink" href="#tile-server" title="Permalink to this heading"></a></h2>
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<p>In order to also serve tiles and be fully independent from <code class="docutils literal notranslate"><span class="pre">Google</span> <span class="pre">Maps</span></code> a tileserver was also started.
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For this the previously donwloaded .pbf file needs to be imported and a postgresql database was used to <em>hopefully</em> speed up the performance.</p>
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<p>First we need to import the data, then start a tileserver.</p>
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<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">Import data</span>
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<span class="gp">$ </span>docker run -v <span class="s2">"</span><span class="si">${</span><span class="nv">PWD</span><span class="si">}</span><span class="s2">/data/netherlands-latest.osm.pbf:/data.osm.pbf"</span> -v openstreetmap-data:/var/lib/postgresql/12/main overv/openstreetmap-tile-server:1.3.10 import
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<span class="go">Run tile server</span>
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<span class="gp">$ </span>docker run -p <span class="m">5997</span>:80 -v openstreetmap-data:/var/lib/postgresql/12/main -d overv/openstreetmap-tile-server:1.3.10 run
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</pre></div>
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</div>
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<p>This will open a map server at port <strong>5997</strong>. When navigating to <em>http://www.herreweb.nl:5997/tile/0/0/0.png</em>, a world map is shown.</p>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>The import step took over 2 hours on a 6-core <em>slow</em> server(Intel Xeon E5-2620 v2). The map server is not fast either, but faster after loading all the map tiles.</p>
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</div>
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