https://community.esri.com/t5/arcgis-network-analyst-questions/service-area-split-dissolve-differ-using-one/m-p/1639915#M9105 <P>Hi,</P><P>why is the network analyst producing different results when calculating the service area in <STRONG>overlap</STRONG> or <STRONG>dissolve</STRONG> compared to <STRONG>split</STRONG> mode (all high precision) using only one facility and the same network data?</P><P>See the screenshots for illustration.</P><P>Cheers,<BR />Merlin</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Merlin_1-1754554485096.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/138016i428FD92B5BE2C4AE/image-size/medium?v=v2&amp;px=400" role="button" title="Merlin_1-1754554485096.png" alt="Merlin_1-1754554485096.png" /></span></P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 07 Aug 2025 08:15:39 GMT Mer-lin 2025-08-07T08:15:39Z https://community.esri.com/t5/arcgis-network-analyst-questions/service-area-split-dissolve-differ-using-one/m-p/1639915#M9105 <P>Hi,</P><P>why is the network analyst producing different results when calculating the service area in <STRONG>overlap</STRONG> or <STRONG>dissolve</STRONG> compared to <STRONG>split</STRONG> mode (all high precision) using only one facility and the same network data?</P><P>See the screenshots for illustration.</P><P>Cheers,<BR />Merlin</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Merlin_1-1754554485096.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/138016i428FD92B5BE2C4AE/image-size/medium?v=v2&amp;px=400" role="button" title="Merlin_1-1754554485096.png" alt="Merlin_1-1754554485096.png" /></span></P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 07 Aug 2025 08:15:39 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/service-area-split-dissolve-differ-using-one/m-p/1639915#M9105 Mer-lin 2025-08-07T08:15:39Z https://community.esri.com/t5/arcgis-network-analyst-questions/service-area-split-dissolve-differ-using-one/m-p/1639996#M9106 <P>The Service Area polygon generation algorithm for split polygons is different from the polygon generation algorithm used for overlapping and dissolved polygons, so some small discrepancies are expected.&nbsp; Note that we are overhauling and improving the split polygon algorithm for the forthcoming Pro 3.6 release, so the results will be more similar to the overlapping case for high precision polygons.</P><P>Split polygons don't make sense for Service Areas with only a single facility and may be slower to generate, so if you have only one facility, you should choose Overlap.</P> Thu, 07 Aug 2025 14:06:50 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/service-area-split-dissolve-differ-using-one/m-p/1639996#M9106 MelindaMorang 2025-08-07T14:06:50Z