Latest Contributions by JaySandhu

Why not use OD Cost Matrix? If you load your locations as origins and destinations and then solve for two closest. Ignore the first as that is itself and the second closest will be be closest among all others. Jay Sandhu ... View more

Aman, Location-Allocation is used for site selection. For example, where to place fire stations so everyone in the city can be covered in 3 minutes. Or where to place warehouses to service stores. You need the locations (population, houses, stores, etc) to server and a set of locations where you can build/open your facilities. You can read more about it online: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Location_allocation_analysis/004700000050000000/ Jay Sandhu ... View more

The utility network toolbar does not require a license. It is included with the base product. But it does require a "geometric" network to work with. It does not work with network datasets that the Network Analyst works with. Perhaps that is what you are missing. Jay Sandhu ... View more

A 400 to 50 OD is not large for the OD solver. So that should not be an issue. Can you give an example of what you are solving on (time) and accumulating on? And examples of the values coming back and what you were expecting? Perhpahs another thing you can do is to run the Closest Facility Solver. Here you map the Origins as Incidents and Destinations. Set to solve for all 50 facilities and turn on the accumulations. You should get the same results as the OD. Now if the accumulations are wrong, you can inspect the associated "route" for that OD pair and see/add up the individual edge values to see why/where the accumulations are wrong or perhaps that will pinpoint some bad data. Regards, Jay Sandhu ... View more

By "All" do you mean the point would located on all nearby edges? Or are you trying to locate on edges of a certain kind that are not the "closest". If that is the case, you can specify a query which can be executed during the location to avoid certain edges. You can read more on the "Snapping environment with Build Query" here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/What_are_network_analysis_objects/00470000003n000000/ Jay Sandhu ... View more

Nick, You are trying to describe a behavior on how the solver should work to solve your problem. But you are not describing your problem in detail. So I am going to guess that what you are trying to do is solve "The Transportation Problem". That is, you have a set of supply locations, a set of demand locations, capacity on the road network and the goal is to minimize shipping costs of moving a given amount of goods through the capacitated network. If this sounds like what you are trying to do and you are not famillar with "The Transportation Problem", I would suggest doing a web search. A way to sovle it with linear programming is described here: http://extension.oregonstate.edu/catalog/pdf/em/em8779-e.pdf If this is what you were trying to do, then you can use the above methodology to use the OD Cost matrix to compute the travel costs, export them to an appropriate LP and solve. An example of this is here: http://resources.arcgis.com/gallery/file/geoprocessing/details?entryID=C4E79AE3-1422-2418-88B2-008CC5F9D24F The above demonstrates how to use the LP approach for School allocation. You will have to modify it to solve your problem instance. Regards, Jay Sandhu ... View more

You can use the Add Locations tool to load "stops" into a route analysis layer. I will suggest that you look at the tutorial on how to do route analysis with mode builder here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Exercise_6_Creating_a_model_for_route_analysis/004700000061000000/ Regards, Jay Sandhu ... View more

Network Analyst finds paths my minimizing the cummulative path length. Based on your description, I was not able to understan what you are trying to achieve. Perhaps you can elaborate... Jay Sandhu ... View more

You can do this by a simple process: First solve the shortest path between the two locations. Save/export the results. Now in the NA Window, right click on the Line Barriers and select Load Locations In the "Load From:", pick the existing route layer's Routes sub layer and click OK. The current shortest path will now be loaded in as restriction! Double-click on the newly added line restriction to open it's properties. Change the "BarrierType" from Restriction to Scaled Cost and in the next column, some thing like Attr_Time (or what ever your impedance attribute was), change the value to be 1.2 Solve. You should get a new path. Save/export this. Now repeate the above process to load the new path as a scaled cost restriction and solve again. The 1.2 means you are penalizing the current path by 20 percent. So it may find another path. You can change the penalty factor as needed for your area. e.g., 1.1 may work better. 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. Regards, Jay Sandhu ... View more

Can you describe what would be an acceptable second or third shortest path for your application? Jay Sandhu ... View more

To help narrow down the problem, create a route analysis layer and turn on the accumulations as in the OD Cost matrix and run a path between two known locations and examine the accumulations. Do they appear right? Alternatively you can use the Network Identify button (second from right on the NA toolbar) and click on a network edge and examine the values of the impedances that you are accumulating. Do they appear to be correct? Jay Sandhu ... View more

You can "drape" the road feature class that makes up the network dataset and convert to 3D. And then you can build a network dataset from it. For converting 2D data to 3D, see the following: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Deriving_the_existing_features_heights_from_a_surface/00q80000005m000000/ Jay Sandhu ... View more

Aman, Can you describe what are you trying to achieve? Is this for visualization? Is to create 3d networks? And when you say: "but it's not succeeded and found a rigorous problem in this work" Can you say what you tried and problem did you find? Regards, Jay Sandhu ... View more

Everything what I found is in a Load Location window Attr_Lenght, where I can set one number for all selected streets segments, which does not satisfy my constrains. Does anybody know how to use scaled cost line barrier using as a cost values from a field? . On the Load Location menu, where you see Attr_Length, the next column is the "Field" column. You can click in there and see the drop down list of fields that you can map to the Attr_Length property. The next column is the Default Value column where you can type in a single number. So use the middle column to map your field as the cost attribute. You can read more about it here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00470000003t000000.htm Jay Sandhu ... View more

You need to add a network data set to ArcMap with the add data dialog. Once a network is added, the options in NA toolbar will no longer be gray. Jay Sandhu ... View more