topic geometryEngine.union creates slivers in ArcGIS JavaScript Maps SDK Questions https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/geometryengine-union-creates-slivers/m-p/731562#M67794 <HTML><HEAD></HEAD><BODY><P>Any obvious reason why&nbsp;a dissolve of selected polygons (by way of geometryEngine.union()) is creating slivers in between the coincident input polygons?</P><P></P><P></P><PRE class="lia-code-sample line-numbers language-none"><CODE>dissolveSelectedPolygons<SPAN class="punctuation token">:</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> <SPAN class="keyword token">var</SPAN> graphicsToDissolve <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>parcelLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getSelectedFeatures</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> geometriesToDissolve <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN> geometriesToDissolve<SPAN class="punctuation token">.</SPAN><SPAN class="token function">push</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>clientSideScratchLayer<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> newGeometry <SPAN class="operator token">=</SPAN> geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">union</SPAN><SPAN class="punctuation token">(</SPAN>geometriesToDissolve<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>clientSideScratchLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">clear</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>clientSideScratchLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">createGraphicFromGeometry</SPAN><SPAN class="punctuation token">(</SPAN>newGeometry<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN> ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE></BODY></HTML> Sun, 12 Dec 2021 07:13:55 GMT JamesCrandall 2021-12-12T07:13:55Z geometryEngine.union creates slivers https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/geometryengine-union-creates-slivers/m-p/731562#M67794 <HTML><HEAD></HEAD><BODY><P>Any obvious reason why&nbsp;a dissolve of selected polygons (by way of geometryEngine.union()) is creating slivers in between the coincident input polygons?</P><P></P><P></P><PRE class="lia-code-sample line-numbers language-none"><CODE>dissolveSelectedPolygons<SPAN class="punctuation token">:</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> <SPAN class="keyword token">var</SPAN> graphicsToDissolve <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>parcelLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getSelectedFeatures</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> geometriesToDissolve <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN> geometriesToDissolve<SPAN class="punctuation token">.</SPAN><SPAN class="token function">push</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>clientSideScratchLayer<SPAN class="punctuation token">.</SPAN>graphics<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>geometry<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> newGeometry <SPAN class="operator token">=</SPAN> geometryEngine<SPAN class="punctuation token">.</SPAN><SPAN class="token function">union</SPAN><SPAN class="punctuation token">(</SPAN>geometriesToDissolve<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>clientSideScratchLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">clear</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN>clientSideScratchLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">createGraphicFromGeometry</SPAN><SPAN class="punctuation token">(</SPAN>newGeometry<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN> ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE></BODY></HTML> Sun, 12 Dec 2021 07:13:55 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/geometryengine-union-creates-slivers/m-p/731562#M67794 JamesCrandall 2021-12-12T07:13:55Z Re: geometryEngine.union creates slivers https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/geometryengine-union-creates-slivers/m-p/731563#M67795 <HTML><HEAD></HEAD><BODY><P>Robert has answered this in another post <A _jive_internal="true" href="https://community.esri.com/thread/185765-union-geometry-not-accurate" target="_blank">HERE</A>.</P><P></P><PRE class="lia-code-sample line-numbers language-none"><CODE>yourFeatureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">setMaxAllowableOffset</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> yourFeatureLayer<SPAN class="punctuation token">.</SPAN><SPAN class="token function">setAutoGeneralize</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">false</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE></BODY></HTML> Sun, 12 Dec 2021 07:13:58 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/geometryengine-union-creates-slivers/m-p/731563#M67795 JamesCrandall 2021-12-12T07:13:58Z