Latest Contributions by JaySandhu

I looked at the screen shots and here is what I think is going on: First, your connectivity model is not correct as the local and minor roads are in their own connectivity group and DO NOT connect the major roads, highways, etc. If you want to maintain these two groups, you will have to create a junction feature class and bring that in and have it span the two connectivity groups. I suggest you look at the Paris data in the network analyst tutorials for examples. This would explain why your service area crosses over the highways. That is, they are not connected to the local roads and the service area sovler will not know they are even there. Second, it is not clear how you have defined the restrictions. How is the evaluator set up? Your screen shot on the attributes has a restriction field set to all 1's. Does that mean all roads in that connectivity group are restricted? That would explain why you get the message that facilities are located on non-traversable elements. Third, your network dataset says it is not built. So perhaps you made some changes and have not built it again. Hopefully you can fix the connectivity, build and try again. Jay Sandhu ... View more

There is no out of the box way to sum up capacity but it should be very easy to do. Using Closest Facility, when you load locations to add in the Incidents (forest stands), you can map over the amount of residue at those locations. To do this, create the CF layer, then open the Attribute table for Incidents and add a field called Residue of type double. Now in the NA Window, right-click the Incidents and Load Locations. This brings up the form to choose your forest stands to load from. In the Location Analysis Properties, you will see "Residue" listed. Click on the Field and drop down and pick the appropriate field containing the residues at that location. Load the locations. Now you will have the residue field loaded on the Incidents. Solve the CF layer and now you can Sum up the residue being brought into that facility. You can read more about loading locations with additional properties here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/in_ArcMap/00470000003t000000/ Jay Sandhu ... View more

You are generating 1 minute polygons so they should be small and they look small. I think they are what they should be. To verify the correctness, bring up the service area layer properties and on the line generation tab, turn on lines as well. Re-solve. Now you will see the actual roads traversed in 1 minutes and the polygons should encompass. Since you have trim off, you could turn that on and set tht trim to be smaller distance like 20 meters to see changes in the shape. Regards, Jay Sandhu ... View more

Do try by splitting the data. Can you tell me what version of the ArcGIS software you are using and how much RAM is on that machine? It could be running out of memory. Jay Sandhu ... View more

Location-Allocation will assign each of the 2000 inspection sites to the closest of the three facilities. This may not be the solution you are looking for. Perhaps you can use the Vehicle Problem Solver to solve this. Make your 2000 inspection locations as Orders. Make your three facilities as depots and add three routes, one for each depot. Set each Depot to have a capacity of 667 and solve. You may have to adjust the capcity and relax some constraints but you should have a reasonable solution. Jay Sandhu ... View more

You will have to add a TravelTime attribute and then set it's "Evaluators" to a field with an expression such as:  [LENGTH] / [Speed] ) * 60 This assuming the length is in miles and the speed is in miles per hour. You can change this expression based on the units of length and speed in your data. An example of setting a walk or pedestrian time is in Tutorial 2. Search for the word "PedestrianTime" at the following link to see how to set that up: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00470000005v000000.htm Jay Sandhu ... View more

There are no limitations on the record numbers. Though loading and working with 2 million may take a while. Have you opened the Stops sub layer's attribute table and verified their are only 71,200 records? The NA Window does not allow you to "expand" the stops there as it will take a long time to refresh that window if their are hundred's of things in it. But will show a accurate number of records that were loaded. You could also run the GP tool Add Locations to first compute the network location fields on your input data (both sets) and look at the status field to make sure they are getting "located" on the network. Once you have verified that the data is correct then you can load this data into a route layer's Stops feature class using the network fields (not geometry) and the load will go very fast. Jay Sandhu ... View more

300 minute service area in some parts of the country may fail on 2 GB machines. Since you are running on a 64 bit environment with 6 GB, and if you are running ArcGIS 10.0, then it will be able to use up to 4 GB. It should work with the chunking on. I will suggest that you add a TRIM of 500 to 1000 meters otherwise the polygons will look like blobs. The trim should add couple of extra minutes to each solve but results in much better looking polygons. If it does not work then I will suggest that you run it as background GP process with Solve tool in the network analyst toolbox. Make sure to have created the service area layer AFTER you add the registry keys as that will make that service area layer use the registry settings. Jay Sandhu ... View more

Take a look at the network analyst tutorial dataset on Paris which has pedestrian times set. You may have to install the data from the appropriate DVD. The tutorial exercise 2 will help with this dataset: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Exercise_2_Creating_a_multimodal_network_dataset/00470000005v000000/ Jay Sandhu ... View more

This is easy to do with the Route solver using the ROUTENAME property. This has been described in the forums many times. Search on the ROUTENAME and you will find previous posts. For example: http://forums.arcgis.com/threads/12128-add-origin-amp-destination-locations-from-the-same-row-to-a-route-analysis-layer?highlight=routename Jay Sandhu ... View more

>In my new route attribute table, the total_minute and total_meter is `zero`, how I can correct it? Have you added stops and solved a path? If yes, is there a route that was generated and displayed? Does that look ok? If yes, then is there any kind of length/time attribute generated? if everything looks good then it is possible that you have no values loaded for your minutes and meters attribute that you are trying to accumulate. In that case, what network data are you using and how did you set up the evaluators for these impedance attributes and did you build the network after creating it? So basically many things could go on, but the above list will get you started in diagnosing the problem. >Second question, in new route, there is a hierarchy (for type of roads) but I don�??t know how I can give each one specific limited speed. It depends on what you network dataset you are using and how you created it. If you want to modify the speed at solve time, you have to create a parameterized evaluator and then you can specify the parameter at run time. You can read more about them here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Using_parameters_with_network_attributes/00470000000s000000/ Jay Sandhu ... View more

The route solver already has the capabilities to find the best sequence. This is also called the travelling salesman problem. As documented in the help page: routeParams.findBestSequence=true; routeParams.preserveFirstStop=false; routeParams.preserveLastStop=false; routeParams.returnStops = true; Change the preserverFirstStop and the preserveLastStop to be true and the returnStops to be false so that you start and end at the first and last stop and everything else (best sequence) will be computed by the route solver. Jay Sandhu ... View more

It will be more efficent if you wrote your own network traversal, simillar to service area but now you are in the realm of graph algorithms and yes, arcobject to access the network forward star. I would not recommend this path as it will take longer to write/debug this approach as opposed to the one day run time of the approach outlined previously. In any case, the other approaches will still have to solve for each 30,000 origins to determine the adjacenies. There is no additional information that will say which are the adjacent locations without running a search from each origin location. Jay Sandhu ... View more

Andres, The process you described is probably the best you can do with less programming for the type of adjacency that you descibe. Assuming on an average 3 adjacent locations, 30,000 times 3 is 90,000 solves. And since these routes should be small, individual solves should happen quite quick. So the whole process may finish in a day. Jay Sandhu ... View more

>while trying to model service area, roads that are within 300m of the access point (visible by sight) are not being included, can you suggest some solutions? Are you using detailed polygon option? You may also want to set the trim distance to 10 meters instead of the 100 meters default as you are only doing 300m. If the road are still not being included, then you can bring up the service area layer's properties and on the Line Generation tab and turn on the lines. Solve again. This should show the lines that are allocated to your locations and the polygons should cover them. >While trying to model closest facility, not all postcodes (incidents) are given a route to the nearest facility, even without a cut off of 300m. Then perhaps there is something wrong in the street data that a path can not be found to what you think is the closest facility. Create a Route layer and try to find a path between your location and what you think should be the closest. And see if a path can be found. If not, perhaps you can use the Network Identify tool (second icon from right on the NA toolbar) and click on your edges to see if they appear to connect to each other properly. Jay Sandhu ... View more