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405 lines
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<title>GEOS: geos::noding::snap::SnappingNoder Class Reference</title>
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<li class="navelem"><a class="el" href="namespacegeos.html">geos</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1noding.html">noding</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1noding_1_1snap.html">snap</a></li><li class="navelem"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html">SnappingNoder</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<a href="#pri-attribs">Private Attributes</a> |
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<a href="classgeos_1_1noding_1_1snap_1_1SnappingNoder-members.html">List of all members</a> </div>
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<div class="title">geos::noding::snap::SnappingNoder Class Reference</div> </div>
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<p><code>#include <<a class="el" href="SnappingNoder_8h_source.html">SnappingNoder.h</a>></code></p>
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Inheritance diagram for geos::noding::snap::SnappingNoder:</div>
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Collaboration diagram for geos::noding::snap::SnappingNoder:</div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a6cbef831d9dadfa551bb578ad4681d57"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#a6cbef831d9dadfa551bb578ad4681d57">SnappingNoder</a> (double p_snapTolerance)</td></tr>
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<tr class="separator:a6cbef831d9dadfa551bb578ad4681d57"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a215583e51f7562c2f22ef46133b57f05"><td class="memItemLeft" align="right" valign="top">std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#a215583e51f7562c2f22ef46133b57f05">getNodedSubstrings</a> () const override</td></tr>
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<tr class="separator:a215583e51f7562c2f22ef46133b57f05"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:af1cfc5fae753fc583151d47464000297"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#af1cfc5fae753fc583151d47464000297">computeNodes</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > *inputSegStrings) override</td></tr>
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<tr class="memdesc:af1cfc5fae753fc583151d47464000297"><td class="mdescLeft"> </td><td class="mdescRight">Computes the noding for a collection of <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentStrings</a>. <a href="#af1cfc5fae753fc583151d47464000297">More...</a><br /></td></tr>
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<tr class="separator:af1cfc5fae753fc583151d47464000297"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_classgeos_1_1noding_1_1Noder"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgeos_1_1noding_1_1Noder')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classgeos_1_1noding_1_1Noder.html">geos::noding::Noder</a></td></tr>
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<tr class="memitem:a51af7a896051686b867d1e6aac6f8387 inherit pub_methods_classgeos_1_1noding_1_1Noder"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1Noder.html#a51af7a896051686b867d1e6aac6f8387">~Noder</a> ()</td></tr>
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<tr class="separator:a51af7a896051686b867d1e6aac6f8387 inherit pub_methods_classgeos_1_1noding_1_1Noder"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-methods"></a>
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Private Member Functions</h2></td></tr>
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<tr class="memitem:aa3f84e97b0847ee5be6307714b648451"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#aa3f84e97b0847ee5be6307714b648451">snapVertices</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &segStrings, std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &nodedStrings)</td></tr>
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<tr class="separator:aa3f84e97b0847ee5be6307714b648451"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac8d64d72df6e8cdff136c186bccc330d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#ac8d64d72df6e8cdff136c186bccc330d">snapVertices</a> (<a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> *ss)</td></tr>
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<tr class="separator:ac8d64d72df6e8cdff136c186bccc330d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a123df8639227fcec327c7de559e40dde"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#a123df8639227fcec327c7de559e40dde">snap</a> (<a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *cs)</td></tr>
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<tr class="separator:a123df8639227fcec327c7de559e40dde"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1cc117497c0c8fea4519e720a162a79a"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#a1cc117497c0c8fea4519e720a162a79a">snapIntersections</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &inputSS)</td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-attribs"></a>
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Private Attributes</h2></td></tr>
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<tr class="memitem:a901bdb5d73a1a4a20d2dd9fd2afb0752"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#a901bdb5d73a1a4a20d2dd9fd2afb0752">snapTolerance</a></td></tr>
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<tr class="separator:a901bdb5d73a1a4a20d2dd9fd2afb0752"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac193c8030febb4980be9e5ab5454a499"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingPointIndex.html">SnappingPointIndex</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#ac193c8030febb4980be9e5ab5454a499">snapIndex</a></td></tr>
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<tr class="separator:ac193c8030febb4980be9e5ab5454a499"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6fd7032f0dd6aac5d21446caf0eab3f9"><td class="memItemLeft" align="right" valign="top">std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html#a6fd7032f0dd6aac5d21446caf0eab3f9">nodedResult</a></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
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Additional Inherited Members</h2></td></tr>
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<tr class="inherit_header pro_methods_classgeos_1_1noding_1_1Noder"><td colspan="2" onclick="javascript:toggleInherit('pro_methods_classgeos_1_1noding_1_1Noder')"><img src="closed.png" alt="-"/> Protected Member Functions inherited from <a class="el" href="classgeos_1_1noding_1_1Noder.html">geos::noding::Noder</a></td></tr>
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<tr class="memitem:a44ae3fde11fa58e6f3637ebd67f6571e inherit pro_methods_classgeos_1_1noding_1_1Noder"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1Noder.html#a44ae3fde11fa58e6f3637ebd67f6571e">Noder</a> ()</td></tr>
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<tr class="separator:a44ae3fde11fa58e6f3637ebd67f6571e inherit pro_methods_classgeos_1_1noding_1_1Noder"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Nodes a set of segment strings snapping vertices and intersection points together if they lie within the given snap tolerance distance. Vertices take priority over intersection points for snapping. Input segment strings are generally only split at true node points (i.e. the output segment strings are of maximal length in the output arrangement).</p>
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<p>The snap tolerance should be chosen to be as small as possible while still producing a correct result. It probably only needs to be small enough to eliminate "nearly-coincident" segments, for which intersection points cannot be computed accurately. This implies a factor of about 10e-12 smaller than the magnitude of the segment coordinates.</p>
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<p>With an appropriate snap tolerance this algorithm appears to be very robust. So far no failure cases have been found, given a small enough snap tolerance.</p>
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<p>The correctness of the output is not verified by this noder. If required this can be done by <a class="el" href="classgeos_1_1noding_1_1ValidatingNoder.html">noding::ValidatingNoder</a>. </p>
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<p>Definition at line <a class="el" href="SnappingNoder_8h_source.html#l00066">66</a> of file <a class="el" href="SnappingNoder_8h_source.html">SnappingNoder.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::noding::snap::SnappingNoder::SnappingNoder </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>p_snapTolerance</em></td><td>)</td>
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<p>Creates a snapping noder using the given snap distance tolerance. </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">p_snapTolerance</td><td>points are snapped if within this distance </td></tr>
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<p>Definition at line <a class="el" href="SnappingNoder_8h_source.html#l00099">99</a> of file <a class="el" href="SnappingNoder_8h_source.html">SnappingNoder.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::noding::snap::SnappingNoder::computeNodes </td>
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<td>(</td>
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<td class="paramtype">std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > * </td>
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<td class="paramname"><em>segStrings</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">override</span><span class="mlabel">virtual</span></span> </td>
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<p>Computes the noding for a collection of <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentStrings</a>. </p>
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<p>Some Noders may add all these nodes to the input SegmentStrings; others may only add some or none at all.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">segStrings</td><td>a collection of <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>s to node The caller remains responsible for releasing the memory associated with the container and its elements. </td></tr>
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<p>Implements <a class="el" href="classgeos_1_1noding_1_1Noder.html#a42da20658cf8a969a1cbb15fd2de725d">geos::noding::Noder</a>.</p>
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<td class="memname">std::vector<<a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>*>* geos::noding::snap::SnappingNoder::getNodedSubstrings </td>
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<dl class="section return"><dt>Returns</dt><dd>a Collection of NodedSegmentStrings representing the substrings </dd></dl>
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<p>Implements <a class="el" href="classgeos_1_1noding_1_1Noder.html#a47dfe5a95741c2c9809d94f8ba39fa89">geos::noding::Noder</a>.</p>
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<td class="memname">std::unique_ptr<std::vector<<a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>> > geos::noding::snap::SnappingNoder::snap </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> * </td>
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<td class="memname">std::unique_ptr<std::vector<<a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>*> > geos::noding::snap::SnappingNoder::snapIntersections </td>
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<td>(</td>
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<td class="paramtype">std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > & </td>
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<p>Computes all interior intersections in the collection of <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>s, and returns their <a class="el" href="">Coordinate</a>s.</p>
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<p>Also adds the intersection nodes to the segments.</p>
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<dl class="section return"><dt>Returns</dt><dd>a list of Coordinates for the intersections </dd></dl>
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<td class="memname">void geos::noding::snap::SnappingNoder::snapVertices </td>
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<td class="memname"><a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>* geos::noding::snap::SnappingNoder::snapVertices </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * </td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">std::vector<<a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>*>* geos::noding::snap::SnappingNoder::nodedResult</td>
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<p>Definition at line <a class="el" href="SnappingNoder_8h_source.html#l00073">73</a> of file <a class="el" href="SnappingNoder_8h_source.html">SnappingNoder.h</a>.</p>
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<td class="memname"><a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingPointIndex.html">SnappingPointIndex</a> geos::noding::snap::SnappingNoder::snapIndex</td>
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<p>Definition at line <a class="el" href="SnappingNoder_8h_source.html#l00072">72</a> of file <a class="el" href="SnappingNoder_8h_source.html">SnappingNoder.h</a>.</p>
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<td class="memname">double geos::noding::snap::SnappingNoder::snapTolerance</td>
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<p>Definition at line <a class="el" href="SnappingNoder_8h_source.html#l00071">71</a> of file <a class="el" href="SnappingNoder_8h_source.html">SnappingNoder.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="SnappingNoder_8h_source.html">SnappingNoder.h</a></li>
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