geometryEngine.union creates slivers

JamesCrandall

Any obvious reason why a dissolve of selected polygons (by way of geometryEngine.union()) is creating slivers in between the coincident input polygons?

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>

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JamesCrandall

Robert has answered this in another post HERE.

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>