topic Re: Second shortest path in ArcGIS Network Analyst Questions https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2766#M29 <HTML><HEAD></HEAD><BODY><SPAN>As a second/third shortest path I mean a route between my points, which is a little longer than the standard shortest path. I would like to be able to prepare 3 possible routes connecting my points, where I can say something like: you can go from point A to point B by route 1 and this will take 5 minutes, by route 2 and this will take 6 minutes or by a route 3 and this will take 7 minutes.</SPAN></BODY></HTML> Tue, 22 Mar 2011 15:19:43 GMT JoannaLaroussi 2011-03-22T15:19:43Z Second shortest path https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2764#M27 <HTML><HEAD></HEAD><BODY><SPAN>Is any option in Network Analyst to create not only the shortest path between points, but also second and third shortest path?</SPAN></BODY></HTML> Tue, 22 Mar 2011 14:58:42 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2764#M27 JoannaLaroussi 2011-03-22T14:58:42Z Re: Second shortest path https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2765#M28 <HTML><HEAD></HEAD><BODY><SPAN>Can you describe what would be an acceptable second or third shortest path for your application?</SPAN><BR /><BR /><SPAN>Jay Sandhu</SPAN></BODY></HTML> Tue, 22 Mar 2011 15:05:34 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2765#M28 JaySandhu 2011-03-22T15:05:34Z Re: Second shortest path https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2766#M29 <HTML><HEAD></HEAD><BODY><SPAN>As a second/third shortest path I mean a route between my points, which is a little longer than the standard shortest path. I would like to be able to prepare 3 possible routes connecting my points, where I can say something like: you can go from point A to point B by route 1 and this will take 5 minutes, by route 2 and this will take 6 minutes or by a route 3 and this will take 7 minutes.</SPAN></BODY></HTML> Tue, 22 Mar 2011 15:19:43 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2766#M29 JoannaLaroussi 2011-03-22T15:19:43Z Re: Second shortest path https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2767#M30 <HTML><HEAD></HEAD><BODY><SPAN>You can do this by a simple process:</SPAN><BR /><SPAN>First solve the shortest path between the two locations.</SPAN><BR /><SPAN>Save/export the results.</SPAN><BR /><SPAN>Now in the NA Window, right click on the Line Barriers and select Load Locations</SPAN><BR /><SPAN>In the "Load From:", pick the existing route layer's Routes sub layer and click OK.</SPAN><BR /><SPAN>The current shortest path will now be loaded in as restriction!</SPAN><BR /><SPAN>Double-click on the newly added line restriction to open it's properties.</SPAN><BR /><SPAN>Change the "BarrierType" from Restriction to Scaled Cost and in the next column,</SPAN><BR /><SPAN>some thing like Attr_Time (or what ever your impedance attribute was), change the value to be 1.2</SPAN><BR /><SPAN>Solve. You should get a new path. Save/export this.</SPAN><BR /><SPAN>Now repeate the above process to load the new path as a scaled cost restriction and solve again.</SPAN><BR /><BR /><SPAN>The 1.2 means you are penalizing the current path by 20 percent. So it may find another path.</SPAN><BR /><SPAN>You can change the penalty factor as needed for your area. e.g., 1.1 may work better.</SPAN><BR /><BR /><SPAN>So what we did was to use the existing shortest path to penalize the underlying roads a little bit and force the solver to find an alternate solution.</SPAN><BR /><BR /><SPAN>Regards,</SPAN><BR /><SPAN>Jay Sandhu</SPAN></BODY></HTML> Tue, 22 Mar 2011 15:45:39 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2767#M30 JaySandhu 2011-03-22T15:45:39Z Re: Second shortest path https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2768#M31 <HTML><HEAD></HEAD><BODY><SPAN>Thank you. I hoped for some out of the box solution, but this will also work for me.</SPAN></BODY></HTML> Tue, 22 Mar 2011 16:07:05 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/second-shortest-path/m-p/2768#M31 JoannaLaroussi 2011-03-22T16:07:05Z