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<p>An algorithm for computing a distance metric which is an approximation to the Hausdorff <a class="el" href="classgeos_1_1algorithm_1_1Distance.html" title="Functions to compute distance between basic geometric structures. ">Distance</a> based on a discretization of the input <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>.
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<p><code>#include <<a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>></code></p>
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<tr class="memitem:a691035954eb6881c7124b9d55716bfa0"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a691035954eb6881c7124b9d55716bfa0">DiscreteHausdorffDistance</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &p_g0, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &p_g1)</td></tr>
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<tr class="separator:a691035954eb6881c7124b9d55716bfa0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a83c84f436933402aae360a3115336416"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a83c84f436933402aae360a3115336416">setDensifyFraction</a> (double dFrac)</td></tr>
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<tr class="memitem:a7089843f2a6cdcf015509b4dba1d8d42"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a7089843f2a6cdcf015509b4dba1d8d42">distance</a> ()</td></tr>
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<tr class="separator:a7089843f2a6cdcf015509b4dba1d8d42"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a520ffe124732bb78c7fcf53f8a837bd4"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a520ffe124732bb78c7fcf53f8a837bd4">orientedDistance</a> ()</td></tr>
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<tr class="memitem:a967ff354d3827af9100e36bdd0cf5a1a"><td class="memItemLeft" align="right" valign="top">const std::array< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>, 2 > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a967ff354d3827af9100e36bdd0cf5a1a">getCoordinates</a> () const </td></tr>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:abfe80c59bd22ce6617af00c37be98348"><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#abfe80c59bd22ce6617af00c37be98348">distance</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &<a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a434b0a3504600af240b06e3bb0f339d3">g0</a>, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &<a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#aa722ddab0619dbac0bed81f867f30486">g1</a>)</td></tr>
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<tr class="memitem:aebc8cecc70327b0c19e75c87a64be699"><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#aebc8cecc70327b0c19e75c87a64be699">distance</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &<a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a434b0a3504600af240b06e3bb0f339d3">g0</a>, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &<a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#aa722ddab0619dbac0bed81f867f30486">g1</a>, double <a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a1c590ce8beb97d43640f6f7aaaa199e7">densifyFrac</a>)</td></tr>
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Private Member Functions</h2></td></tr>
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<tr class="memitem:a428ab7f8452ef062aae509758824ae26"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a428ab7f8452ef062aae509758824ae26">compute</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &p_g0, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &p_g1)</td></tr>
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<tr class="memitem:aefed03f035f99633cc285bd3ebf36011"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#aefed03f035f99633cc285bd3ebf36011">computeOrientedDistance</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &discreteGeom, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> &geom, <a class="el" href="classgeos_1_1algorithm_1_1distance_1_1PointPairDistance.html">PointPairDistance</a> &<a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a19241129e23cb5666b78292807754016">ptDist</a>)</td></tr>
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<tr class="separator:aefed03f035f99633cc285bd3ebf36011"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7f508ed084457d1d5f5e0c9ba22f12d3"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a7f508ed084457d1d5f5e0c9ba22f12d3">DiscreteHausdorffDistance</a> (const <a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html">DiscreteHausdorffDistance</a> &other)=delete</td></tr>
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<tr class="memitem:a5bd1dae7730905c71b945a7797e210bc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html">DiscreteHausdorffDistance</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a5bd1dae7730905c71b945a7797e210bc">operator=</a> (const <a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html">DiscreteHausdorffDistance</a> &rhs)=delete</td></tr>
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Private Attributes</h2></td></tr>
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<tr class="memitem:a434b0a3504600af240b06e3bb0f339d3"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a434b0a3504600af240b06e3bb0f339d3">g0</a></td></tr>
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<tr class="separator:a434b0a3504600af240b06e3bb0f339d3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa722ddab0619dbac0bed81f867f30486"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#aa722ddab0619dbac0bed81f867f30486">g1</a></td></tr>
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<tr class="separator:aa722ddab0619dbac0bed81f867f30486"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a19241129e23cb5666b78292807754016"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1PointPairDistance.html">PointPairDistance</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a19241129e23cb5666b78292807754016">ptDist</a></td></tr>
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<tr class="memitem:a1c590ce8beb97d43640f6f7aaaa199e7"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html#a1c590ce8beb97d43640f6f7aaaa199e7">densifyFrac</a></td></tr>
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<tr class="memdesc:a1c590ce8beb97d43640f6f7aaaa199e7"><td class="mdescLeft"> </td><td class="mdescRight">Value of 0.0 indicates that no densification should take place. <a href="#a1c590ce8beb97d43640f6f7aaaa199e7">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>An algorithm for computing a distance metric which is an approximation to the Hausdorff <a class="el" href="classgeos_1_1algorithm_1_1Distance.html" title="Functions to compute distance between basic geometric structures. ">Distance</a> based on a discretization of the input <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>. </p>
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<p>The algorithm computes the Hausdorff distance restricted to discrete points for one of the geometries. The points can be either the vertices of the geometries (the default), or the geometries with line segments densified by a given fraction. Also determines two points of the Geometries which are separated by the computed distance.</p>
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<p>This algorithm is an approximation to the standard Hausdorff distance. Specifically, </p><pre>
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for all geometries a, b: DHD(a, b) <= HD(a, b)
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</pre><p> The approximation can be made as close as needed by densifying the input geometries. In the limit, this value will approach the true Hausdorff distance: </p><pre>
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DHD(A, B, densifyFactor) -> HD(A, B) as densifyFactor -> 0.0
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</pre><p> The default approximation is exact or close enough for a large subset of useful cases. Examples of these are:</p>
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<ul>
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<li>computing distance between Linestrings that are roughly parallel to each other, and roughly equal in length. This occurs in matching linear networks.</li>
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<li>Testing similarity of geometries.</li>
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</ul>
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<p>An example where the default approximation is not close is: </p><pre>
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A = LINESTRING (0 0, 100 0, 10 100, 10 100)
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B = LINESTRING (0 100, 0 10, 80 10)</pre><pre> DHD(A, B) = 22.360679774997898
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HD(A, B) ~= 47.8
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</pre>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00100">100</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00109">109</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00237">237</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname">double geos::algorithm::distance::DiscreteHausdorffDistance::distance </td>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00138">138</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname">const std::array<<a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>, 2> geos::algorithm::distance::DiscreteHausdorffDistance::getCoordinates </td>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00152">152</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1DiscreteHausdorffDistance.html">DiscreteHausdorffDistance</a>& geos::algorithm::distance::DiscreteHausdorffDistance::operator= </td>
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<td class="memname">double geos::algorithm::distance::DiscreteHausdorffDistance::orientedDistance </td>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00145">145</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname">void geos::algorithm::distance::DiscreteHausdorffDistance::setDensifyFraction </td>
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<p>Sets the fraction by which to densify each segment. Each segment will be (virtually) split into a number of equal-length subsegments, whose fraction of the total length is closest to the given fraction.</p>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00127">127</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<p>Value of 0.0 indicates that no densification should take place. </p>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00255">255</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>& geos::algorithm::distance::DiscreteHausdorffDistance::g0</td>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00248">248</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">geom::Geometry</a>& geos::algorithm::distance::DiscreteHausdorffDistance::g1</td>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00250">250</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<td class="memname"><a class="el" href="classgeos_1_1algorithm_1_1distance_1_1PointPairDistance.html">PointPairDistance</a> geos::algorithm::distance::DiscreteHausdorffDistance::ptDist</td>
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<p>Definition at line <a class="el" href="DiscreteHausdorffDistance_8h_source.html#l00252">252</a> of file <a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="DiscreteHausdorffDistance_8h_source.html">DiscreteHausdorffDistance.h</a></li>
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