Latest Contributions by JaySandhu

‎04-25-2023

One of the main reasons loading locations can be slow is that the road feature class does not have a spatial index or the index needs to be rebuilt. In the Catalog pane, find the roads feature class that is part of your network dataset, and right-click to bring up its properties. On the indexes tab, expand the Spatial index and either Create or Recalculate the index. More info here: Modify a spatial index—ArcGIS Pro | Documentation Other reasons could be that the road data is on an external slow drive and it is taking a while to find the closest roads. Jay Sandhu

‎04-18-2023

Yes, it is possible but there are some caveats on Editing. You can read all the details on licensing here: Licensing and the ArcGIS Network Analyst extension—ArcGIS Pro | Documentation Jay Sandhu

‎04-12-2023

If you are using ArcGIS Pro, you can use the Explore Network tool (on the data tab once your network dataset is the active layer in the TOC). Examine the edge and see if all the values on it agree with what you have set. Jay Sandhu

‎04-07-2023

The SPEEDLIMIT field is being used. The speed_limit = 25 line is a fail safe in case some road does not have a limit defined. The issue I believe is the scale factor. You are getting 7 minutes. If you multiply it by 1.25 you will get 8.75 which is close to what you should have gotten. So, I think it was the scale factor that was making your travel time coming back more than the posted speed limit. Jay Sandhu

‎04-07-2023

What exactly was the process used? Did you load the filtered facilities into a service area analysis layer and then solve? In this case only the facilities loaded into the SA layer will have results. Jay Sandhu

‎04-06-2023

I am assuming you are using ArcGIS Pro. Some questions to ask about your network. What is the name of the travel time attribute? I assume it is minutes. How were the values calculated for it from your 35 miles per hour speed? Just having a field called speed limit by itself not do anything. Its values have to be used to compute the Minutes field which should then be loaded into the network during the build phase. You can check the values stored in the network as follows: If you have added the network dataset to the map, then you can bring up the Data tab and click on the Explore Network tool. Now click on a network edge and see what information is stored on the network in terms of the impedance values. Jay Sandhu

‎04-06-2023

When you run the OD analysis, it does not generate the actual shortest path that was taken. So you cannot sum up the edge lenght/minutes that were travelled on. So, what you can do is, take that one OD pair that you are looking at, one with the 8.8 minutes, I believe the origin 1 to destination 8 and solve a route on that. That is, create a route layer, load the 1 and 8 as the two stops and solve. Do you still get the same answer? Now, you can run the GP tool, Copy Traversed Source Features on the resulting route layer. This will create edges, junctions and turn feature classes that contain all the features that were traversed in the shortest path. Now you can add up the edge lengths/travel times and see if they all add up. Regards, Jay Sandhu

‎04-05-2023

Transportation planning generally deals with changing populations and the impact on roads in terms of traffic and planning for the future, i.e., where to add new roads/lanes. ArcGIS Network Analyst deals mostly with routing, logistics, location analysis, not the transportation planning as described above. Dan's suggestion above of starting with the tutorials is an excellent place to start with learning about NA. You can also watch some of the User Conference presentations. E.g., Esri Videos: GIS, Events, ArcGIS Products & Industries Jay Sandhu

‎04-01-2023

Please read my previous post on using service area lines from the six incidents to see where the connectivity is still an issue. Jay Sandhu

‎03-30-2023

What is the source of your data? What is the connectivity policy that you are using? For example, End Point or Any Vertex. If your connectivity policy is End Point then every street feature connects at its end point to another street feature. If there is a gap then the roads are not connected. If your data is from Open Streetmap then you may want to set it as Any Vertex. On the Network Analyst ribbon, the second from the left icon is the Network Identify tool. You can add a network dataset to the Map and use this tool to see how things are connected. It can help diagnose problems. You can read more about connectivity here: Understanding connectivity—ArcMap | Documentation (arcgis.com) Jay Sandhu

‎03-30-2023

What is the source of your road data for Kansas? It is likely the roads are NOT connected and thus you cannot find paths between all your hospitals and accidents. My first suggestion was that you should try to solve a shortest route using the Route analysis layer. Create a new route layer, add one of the hospitals as a stop and then add one of the incidents that did not find a closest as a second stop. Solve. Do you get a path? If not then the road connectivity or some attribute like a one way restriction might be causing the problem. If you do not get a path above, then I suggest that you create a service area layer, load in one of those incidents, and set a service area to solve for 60 minutes break. Make sure to turn on generating the lines on the Lines Generation tab of the service area properties. Solve, and see if you are getting 60 minutes drivetimes. This might help pinpoint the areas where the network is disconnected. Jay Sandhu

‎03-30-2023

What network dataset are you using? It is possible that there are no paths from all the incidents to the facilities. You can take one of the incidents that did not have a facility and put it in a route layer with one of the hospitals and see if you can find any path. This may help diagnose if it is a network data issue. Jay Sandhu

‎01-04-2023

There are probably some logical issues on how the various modes connect that you are not able to find the "shortest" path and are finding a longer path. If you can identify one of the OD pairs, use the start location in a Service Area layer and generate polygons and lines using multiple breaks. Perhaps the shape of the resulting polygons will show you where the problems are occurring. Jay Sandhu

‎01-04-2023

If your network dataset has been built, you can add it a map in ArcGIS Pro and use the Network Dataset Layer, Data tab to bring up the Explore Network tool. Use that tool to look at the connectivity of the edges. This might help find potential issues with the network connectivity. Explore Network—ArcGIS Pro | Documentation Jay Sandhu

‎12-22-2022

Sounds like you want to create shortest path routes between pairs of points. You can do this with the Route solver, not Closest Facility. You can load in the starting points and then map the ID field to the ROUTENAME property. Then load the ending points and map the ID field to the ROUTENAME property. Solve the route layer. This will create routes between each set of unique routename IDs. You can read more on the routename property here: Route analysis layer—ArcGIS Pro | Documentation Jay Sandhu

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My Ideas

Latest Contributions by JaySandhu

Re: Loading Incidents/Facilities is very slow

Re: It´s possible to use extension in Arcgis Desktop Basic single use?

Re: When developing a network with weight restrictions per specific travel modes, the results are not consistent. For example, if I have a travel mode

Re: Checking math in OD Cost Matrix

Re: Service Area - facilities layer not honoring definition query filter

Re: Checking math in OD Cost Matrix

Re: Checking math in OD Cost Matrix

Re: Network Analyst Extension - ArcGIS PRO

Re: Closest Facility: Only Few (Partial) Incidents are solved for the Closest Facility.

Re: Closest Facility: Only Few (Partial) Incidents are solved for the Closest Facility.

Re: Closest Facility: Only Few (Partial) Incidents are solved for the Closest Facility.

Re: Closest Facility: Only Few (Partial) Incidents are solved for the Closest Facility.

Re: How can I build the topology in a multimodal network dataset to successfully find the shortest routes between OD pairs?

Re: Route solver does not find a route

Re: Closest Facility - Have Incidents route to a specified Facility (not just the closest)

Re: Creating a maximum walkshed around each point

Re: Closest Facility - Remove Facilities and Incid...

Re: Polygons for Best Dump Site By Site Cost and T...

Re: Delay in routes

Re: Delay in routes