topic Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations, in ArcGIS Network Analyst Questions

ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JamalNUMAN — Sat, 02 May 2020 19:59:31 GMT

ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

Despite the fact that running “Location-Allocation” model in ArcMap manages to allocate potential destination for each demand point, Pro leaves two of these demands with no such potential destination knowing that all the assumptions are identical in both ArcMap and Pro

What could be the issue here?

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

DavidPike — Sat, 02 May 2020 20:07:17 GMT

Is there some snapping tolerance which is different? e.g snap to nearest network edge / maximum distance etc/

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JaySandhu — Mon, 04 May 2020 15:45:42 GMT

It could be few different reasons. The first is that the settings are not identical. They appear to be. But most likely the network dataset settings such as restrictions could be different. Pro works with a travel mode (custom in your case) and ArcMap works on some defaults if they are set. So check these settings in Pro. Another is that Pro has a slightly different snapping model. So the locations could be snapped to a different edge if there are restrictions present in that area. You could open the attribute table of the demand points and look at the network location fields (e.g. SourceOID) and see if they are the same between ArcMap and Pro, assuming you are using the same network dataset.

Jay Sandhu

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JamalNUMAN — Fri, 08 May 2020 08:46:17 GMT

Thank you guys for the input

I’m getting the same issue when analyzing another network with “service area”. The results in ArcMap is different from those in Pro despite the fact that the settings are identical.

The impedance is “length”

The cutoff: 10000, 12000, 15000

The data is attached

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

DavidPike — Fri, 08 May 2020 08:55:24 GMT

It looks very much like a one-way restriction is applied in your Pro service area.

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JamalNUMAN — Fri, 08 May 2020 09:17:32 GMT

Thanks David

I double checked the direction configuration and found out that both in ArcMap and Pro are bidirectional as in the screenshots below

What other issues should I consider?

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

DavidPike — Fri, 08 May 2020 09:36:12 GMT

On your tool window on the RHS it is set to 'overlap'. change this to split or dissolve.

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JamalNUMAN — Fri, 08 May 2020 18:51:16 GMT

Neither “dissolve” nor “split” gets the “service area” matched with the result in ArcMap

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

MelindaMorang — Fri, 08 May 2020 18:58:37 GMT

Service Area in ArcGIS Pro uses a different polygon generation algorithm than ArcMap, so the results are not expected to look identical. The new polygon generation algorithm creates service areas that look more "bubbly" or more like clean buffers around streets, and it avoids the strange spikes you would occasionally see in ArcMap.

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JaySandhu — Fri, 08 May 2020 19:00:24 GMT

Thanks for including the data. So the issue is that Service Area polygon generation code was improved quite a bit both in performance as well as output polygon quality some years ago. To enable this new behavior, you need to turn on the service area index and rebuild the network. In ArcMap, this is on the network dataset property page under the optimizations tab. If you do this, then ArcMap will generate the same polygons you are seeing in Pro.

In Pro, we enabled these optimizations by default. So even if the network dataset does not have the service area index built, it will build it on the fly and use it. That is why you are seeing different results from ArcMap and Pro.

Now, in your screen shot, the quality of the output polygons does not look nice in Pro (and will not look nice in ArcMap after the index is added). This is because by default the polygon trim is set to 100 meters and you have service area breaks in much larger numbers like 10000 meters. So in ArcMap, change the trim to 1000 meter and solve it again. You will get better and more realistic output. In Pro, the trim can be set when you first make the layer (it is not in the UI yet). So use the GP tool Make Service Area Analysis Layer and set the trim to 1000 meters in the output geometry section (you can see it in the screenshot below with the updated polygon output).

Jay Sandhu

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JaySandhu — Fri, 08 May 2020 19:10:47 GMT

And here is the output from ArcMap with the Service Area Index and same trim settings. It matches Pro.

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JamalNUMAN — Sat, 09 May 2020 15:38:46 GMT

Thank you guys for the prompt help and support.

I’m still getting the same issue for the location-allocation. Same settings in Pro and ArcMap lead to different results. The data is attached (Facilities: Pharmacies, Demand: Zones)

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JaySandhu — Sun, 10 May 2020 17:18:54 GMT

Jamal,

I tried your data and I do not see the results you are seeing. In Pro, I get the same results as in ArcMap.

You could try creating a new project, re-add the data and re-create the Location-Allocation layer and solve. If you still see the different results, then click on the Share tab, and choose the left most option "Project" and then follow the instructions to package the whole project and share it back here and I can take a look at it again.

Jay Sandhu

Re: ArcGIS Pro 2.5: Running “Location-Allocation” model leaves two demands points with no potential facility destinations,

JamalNUMAN — Sun, 10 May 2020 19:03:04 GMT

Many thanks Jay for the prompt help and support.

Correct. I tried it from scratch and I got the same result as in ArcMap