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      <div class="header" role="banner"><img class="rightlogo" src="../_static/pgrouting.png" alt="Logo"/><h1 class="heading"><a href="../index.html">
          <span>pgRouting Manual (2.1.0)</span></a></h1>
        <h2 class="heading"><span>Table of Contents</span></h2>
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  <div class="section" id="table-of-contents">
<span id="index"></span><h1>Table of Contents<a class="headerlink" href="#table-of-contents" title="Permalink to this headline"></a></h1>
<p>pgRouting extends the <a class="reference external" href="http://postgis.net">PostGIS</a>/<a class="reference external" href="http://postgresql.org">PostgreSQL</a> geospatial database to provide geospatial routing and other network analysis functionality.</p>
<p>This is the manual for pgRouting 2.1.0 (b38118a master).</p>
<img alt="Creative Commons Attribution-Share Alike 3.0 License" class="align-left" src="../_images/ccbysa.png" />
<p>The pgRouting Manual is licensed under a <a class="reference external" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-Share Alike 3.0 License</a>. Feel free to use this material any way you like, but we ask that you attribute credit to the pgRouting Project and wherever possible, a link back to <a class="reference external" href="http://pgrouting.org">http://pgrouting.org</a>. For other licenses used in pgRouting see the <a class="reference internal" href="src/introduction/introduction.html#license"><span>License</span></a> page.</p>
<div class="section" id="general">
<h2>General<a class="headerlink" href="#general" title="Permalink to this headline"></a></h2>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="src/introduction/introduction.html">Introduction</a><ul>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/introduction.html#license">License</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/introduction.html#contributors">Contributors</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/introduction.html#inside">Inside</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/introduction.html#more-information">More Information</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="src/installation/index.html">Installation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="src/installation/index.html#download">Download</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/installation/index.html#installing-in-the-database">Installing in the database</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/installation/index.html#upgrading-the-database">Upgrading the database</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="src/installation/build.html">Build Guide</a><ul>
<li class="toctree-l2"><a class="reference internal" href="src/installation/build.html#dependencies">Dependencies</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/installation/build.html#configuration">Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/installation/build.html#building">Building</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/installation/build.html#installation-and-reinstallation">Installation and reinstallation</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="src/introduction/support.html">Support</a><ul>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/support.html#reporting-problems">Reporting Problems</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/support.html#mailing-list-and-gis-stackexchange">Mailing List and GIS StackExchange</a></li>
<li class="toctree-l2"><a class="reference internal" href="src/introduction/support.html#commercial-support">Commercial Support</a></li>
</ul>
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</ul>
</div>
</div>
<div class="section" id="tutorial">
<h2>Tutorial<a class="headerlink" href="#tutorial" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="src/tutorial/index.html#tutorial1"><span>Tutorial</span></a></p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="src/tutorial/tutorial.html#tutorial"><span>Getting started</span></a></li>
<li><a class="reference internal" href="src/tutorial/topology.html#topology"><span>Routing Topology</span></a> for an overview of a topology for routing algorithms.</li>
<li><a class="reference internal" href="src/tutorial/analytics.html#analytics"><span>Graph Analytics</span></a> for an overview of the analysis of a graph.</li>
<li><a class="reference internal" href="src/tutorial/custom_query.html#custom-query"><span>Dictionary of columns &amp; Custom Query</span></a> that is used in the routing algorithms.</li>
<li><a class="reference internal" href="src/tutorial/performance.html#performance"><span>Performance Tips</span></a> to improve your performance.</li>
<li><a class="reference internal" href="src/developer/sampledata.html#sampledata"><span>Sample Data</span></a> that is used in the examples of this manual.</li>
<li><a class="reference internal" href="src/recipes/index.html#recipes"><span>User&#8217;s Recipes List</span></a></li>
</ul>
</div></blockquote>
<div class="toctree-wrapper compound">
</div>
<p>For a more complete introduction how to build a routing application read the <a class="reference external" href="http://workshop.pgrouting.org">pgRouting Workshop</a>.</p>
</div>
<div class="section" id="version">
<h2>Version<a class="headerlink" href="#version" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="../src/common/doc/utilities/version.html#pgr-version"><span>pgr_version</span></a> - to get pgRouting&#8217;s version information.</p>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="data-types">
<h2>Data Types<a class="headerlink" href="#data-types" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="../src/common/doc/types/index.html#data-types"><span>pgRouting Data Types</span></a></p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="../src/common/doc/types/cost_result.html#type-cost-result"><span>pgr_costResult[]</span></a> -  A set of records to describe a path result with cost attribute.</li>
<li><a class="reference internal" href="../src/common/doc/types/cost_result.html#type-cost-result3"><span>pgr_costResult3[]</span></a> - A set of records to describe a path result with cost attribute.</li>
<li><a class="reference internal" href="../src/common/doc/types/geom_result.html#type-geom-result"><span>pgr_geomResult</span></a> - A set of records to describe a path result with geometry attribute.</li>
</ul>
</div></blockquote>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="topology-functions">
<h2>Topology functions<a class="headerlink" href="#topology-functions" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="../src/common/doc/functions/index.html#topology-functions"><span>Topology Functions</span></a></p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="../src/common/doc/functions/create_topology.html#pgr-create-topology"><span>pgr_createTopology</span></a> -  to create a topology based on the geometry.</li>
<li><a class="reference internal" href="../src/common/doc/functions/create_vert_table.html#pgr-create-vert-table"><span>pgr_createVerticesTable</span></a> - to reconstruct the vertices table based on the source and target information.</li>
<li><a class="reference internal" href="../src/common/doc/functions/analyze_graph.html#pgr-analyze-graph"><span>pgr_analyzeGraph</span></a>  - to analyze the edges and vertices of the edge table.</li>
<li><a class="reference internal" href="../src/common/doc/functions/analyze_oneway.html#pgr-analyze-oneway"><span>pgr_analyzeOneway</span></a> - to analyze directionality of the edges.</li>
<li><a class="reference internal" href="../src/common/doc/functions/node_network.html#pgr-node-network"><span>pgr_nodeNetwork</span></a>  -to create nodes to a not noded edge table.</li>
</ul>
</div></blockquote>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="routing-functions">
<h2>Routing functions<a class="headerlink" href="#routing-functions" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="../src/index.html#routing-functions"><span>Routing Functions</span></a></p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="../src/apsp_johnson/doc/index.html#pgr-apsp-johnson"><span>pgr_apspJohnson</span></a>- All Pairs Shortest Path, Johnson’s Algorithm</li>
<li><a class="reference internal" href="../src/apsp_warshall/doc/index.html#pgr-apsp-warshall"><span>pgr_apspWarshall</span></a> - All Pairs Shortest Path, Floyd-Warshall Algorithm</li>
<li><a class="reference internal" href="../src/astar/doc/index.html#pgr-astar"><span>pgr_astar</span></a> - Shortest Path A*</li>
<li><a class="reference internal" href="../src/bd_astar/doc/index.html#bd-astar"><span>pgr_bdAstar</span></a> - Bi-directional A* Shortest Path</li>
<li><a class="reference internal" href="../src/bd_dijkstra/doc/index.html#bd-dijkstra"><span>pgr_bdDijkstra</span></a> - Bi-directional Dijkstra Shortest Path</li>
<li><a class="reference internal" href="../src/dijkstra/doc/index.html#pgr-dijkstra"><span>pgr_dijkstra</span></a> - Shortest Path Dijkstra</li>
<li><a class="reference internal" href="../src/driving_distance/doc/index.html#pgr-driving-distance"><span>pgr_driving_distance</span></a> - Driving Distance</li>
<li><a class="reference internal" href="../src/kdijkstra/doc/index.html#pgr-kdijkstra"><span>pgr_kDijkstra</span></a> - Mutliple destination Shortest Path Dijkstra</li>
<li><a class="reference internal" href="../src/ksp/doc/index.html#pgr-ksp"><span>pgr_ksp</span></a> - K-Shortest Path</li>
<li><a class="reference internal" href="../src/trsp/doc/index.html#trsp"><span>pgr_trsp</span></a> - Turn Restriction Shortest Path (TRSP)</li>
<li><a class="reference internal" href="../src/tsp/doc/index.html#pgr-tsp"><span>pgr_tsp</span></a> - Traveling Sales Person</li>
</ul>
</div></blockquote>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="pre-processing-or-post-processing-helping-functions">
<h2>Pre processing or post processing helping functions<a class="headerlink" href="#pre-processing-or-post-processing-helping-functions" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="../src/driving_distance/doc/index.html#pgr-driving-distance-post"><span>Driving Distance post-processing</span></a></p>
<blockquote>
<div><ul class="simple">
<li><a class="reference internal" href="../src/driving_distance/doc/dd_alphashape.html#pgr-alphashape"><span>pgr_alphaShape</span></a> - Alpha shape computation</li>
<li><a class="reference internal" href="../src/driving_distance/doc/dd_points_as_polygon.html#pgr-points-as-polygon"><span>pgr_pointsAsPolygon</span></a> - Polygon around set of points</li>
</ul>
</div></blockquote>
</div>
<div class="section" id="experimental-and-proposed-functions">
<h2>Experimental and Proposed functions<a class="headerlink" href="#experimental-and-proposed-functions" title="Permalink to this headline"></a></h2>
<dl class="docutils">
<dt>This section contains new experimental or proposed signatures for any of the following sections:</dt>
<dd><ul class="first last simple">
<li>topology functions</li>
<li>routing functions</li>
<li>vehicle routing functions</li>
<li>pre / post procesing helper functions</li>
</ul>
</dd>
</dl>
<p>We are including them so that the pgRouting community can evaluate them before
including them as an official function of pgRouting.</p>
<p>Some of them are unsupported like the GSoC functions.</p>
</div>
<div class="section" id="experimental-functions-proposed-by-steve-woodbridge">
<h2>Experimental functions: Proposed by Steve Woodbridge<a class="headerlink" href="#experimental-functions-proposed-by-steve-woodbridge" title="Permalink to this headline"></a></h2>
<dl class="docutils">
<dt><a class="reference internal" href="../src/common/doc/convenience/index.html#convenience-functions"><span>Convenience Functions</span></a></dt>
<dd><ul class="first last simple">
<li><a class="reference internal" href="../src/common/doc/convenience/point_to_edgenode.html#pgr-point-to-edgenode"><span>pgr_pointToEdgeNode</span></a> - convert a point geometry to a <code class="docutils literal"><span class="pre">vertex_id</span></code> based on closest edge.</li>
<li><a class="reference internal" href="../src/common/doc/convenience/flip_edges.html#pgr-flip-edges"><span>pgr_flipEdges</span></a> - flip the edges in an array of geometries so the connect end to end.</li>
<li><a class="reference internal" href="../src/common/doc/convenience/text_to_points.html#pgr-text-to-points"><span>pgr_textToPoints</span></a> - convert a string of <code class="docutils literal"><span class="pre">x,y;x,y;...</span></code> locations into point geometries.</li>
<li><a class="reference internal" href="../src/common/doc/convenience/points_to_vids.html#pgr-points-to-vids"><span>pgr_pointsToVids</span></a> - convert an array of point geometries into vertex ids.</li>
<li><a class="reference internal" href="../src/common/doc/convenience/points_to_dmatrix.html#pgr-points-to-dmatrix"><span>pgr_pointsToDMatrix</span></a> - Create a distance matrix from an array of points.</li>
<li><a class="reference internal" href="../src/common/doc/convenience/vids_to_dmatrix.html#pgr-vids-to-dmatrix"><span>pgr_vidsToDMatrix</span></a> - Create a distance matrix from an array of <code class="docutils literal"><span class="pre">vertix_id</span></code>.</li>
<li><a class="reference internal" href="../src/common/doc/convenience/vids_to_dmatrix2.html#pgr-vids-to-dmatrix2"><span>pgr_vidsToDMatrix</span></a> - Create a distance matrix from an array of <code class="docutils literal"><span class="pre">vertix_id</span></code>.</li>
</ul>
</dd>
</dl>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="experimental-functions-by-gsoc">
<h2>Experimental functions: by GSoC<a class="headerlink" href="#experimental-functions-by-gsoc" title="Permalink to this headline"></a></h2>
<dl class="docutils">
<dt>The following functions are experimental</dt>
<dd><ul class="first simple">
<li>They may lack documentation,</li>
<li>Were created by GSoC students.</li>
<li>they are unsupported.</li>
</ul>
<blockquote class="last">
<div><ul class="simple">
<li><a class="reference internal" href="../src/vrp_basic/doc/index.html#pgr-vrp-basic"><span>pgr_vrpOneDepot</span></a> - VRP One Depot</li>
<li><a class="reference internal" href="../src/vrppdtw/doc/index.html#pgr-gsocvrppdtw"><span>pgr_vrppdtw - Pickup and Delivery problem</span></a> -  Pickup and Delivery problem</li>
</ul>
</div></blockquote>
</dd>
</dl>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="proposed-functions-proposed-by-zia-mohammed">
<h2>Proposed functions: Proposed by Zia Mohammed<a class="headerlink" href="#proposed-functions-proposed-by-zia-mohammed" title="Permalink to this headline"></a></h2>
<dl class="docutils">
<dt>About this proposal:</dt>
<dd><ul class="first last simple">
<li>Author: Zia Mohammed.</li>
<li>Status: Needs a lot of testing. I am working on that.</li>
<li>I did not add automated test.</li>
<li>Temporary name: pgr_labelGraph</li>
<li>Need: I need feedback from the community.</li>
<li><a class="reference internal" href="../src/label_graph/doc/analyze_brokengraph.html#pgr-labelgraph"><span>pgr_labelGraph</span></a> - Analyze / label  subgraphs within a network</li>
</ul>
</dd>
</dl>
<div class="toctree-wrapper compound">
</div>
<div class="toctree-wrapper compound">
</div>
</div>
<div class="section" id="discontinued-functions">
<h2>Discontinued Functions<a class="headerlink" href="#discontinued-functions" title="Permalink to this headline"></a></h2>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="src/developer/discontinued.html">Discontinued Functions</a></li>
</ul>
</div>
</div>
<div class="section" id="developer">
<h2>Developer<a class="headerlink" href="#developer" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="../src/common/doc/utilities/index.html#developer-functions"><span>Developers&#8217;s Functions</span></a></p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">In V3.0 This function are going to be discontinued. Use the already available underscored version instead.</p>
</div>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last"><a class="reference internal" href="../src/common/doc/utilities/index.html#developer-functions"><span>Developers&#8217;s Functions</span></a> documentation is going to be deleted from the pgRouting documentation in V3.0</p>
</div>
<dl class="docutils">
<dt>The following functions are used internaly the topology functions.</dt>
<dd><ul class="first last simple">
<li><a class="reference internal" href="../src/common/doc/utilities/get_column_name.html#pgr-get-column-name"><span>pgr_getColumnName</span></a> - to get the name of the column as is stored in the postgres administration tables.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/get_table_name.html#pgr-get-table-name"><span>pgr_getTableName</span></a> - to retrieve the name of the table as is stored in the postgres administration tables.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/is_column_indexed.html#pgr-is-column-indexed"><span>pgr_isColumnIndexed</span></a> - to check if the column is indexed.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/is_column_in_table.html#pgr-is-column-in-table"><span>pgr_isColumnInTable</span></a> - to check only for the existance of the column.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/point_to_id.html#pgr-point-to-id"><span>pgr_pointToId</span></a> -to insert/get the id of the inserted point in a vertices table.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/quote_ident.html#pgr-quote-ident"><span>pgr_quote_ident</span></a> - to quotes the input text to be used as an identifier in an SQL statement string.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/versionless.html#pgr-versionless"><span>pgr_versionless</span></a> - to compare two version numbers.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/start_point.html#pgr-start-point"><span>pgr_startPoint</span></a> - to get the start point of a (multi)linestring.</li>
<li><a class="reference internal" href="../src/common/doc/utilities/end_point.html#pgr-end-point"><span>pgr_endPoint</span></a> - to get the end point of a (multi)linestring.</li>
</ul>
</dd>
</dl>
<div class="toctree-wrapper compound">
<ul>
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<p><a class="reference internal" href="src/changelog/index.html#change-log"><span>Release Notes</span></a></p>
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<li><a class="reference internal" href="src/changelog/2_1_0.html#changelog-2-1-0"><span>pgRouting 2.1.0 Release Notes</span></a></li>
<li><a class="reference internal" href="src/changelog/2_0.html#changelog-2-0"><span>pgRouting 2.0 Release Notes</span></a></li>
<li><a class="reference internal" href="src/changelog/1_x.html#changelog-1-x"><span>pgRouting 1.x Release Notes</span></a></li>
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