Latest Contributions by JaySandhu

The route solver will sum the length of all the features (and prorated length of the partial features at begining and end of the route) and return the sum. It cannot be any different than the length field that is being used in the evaluator. Are you absolutely sure that the evaluator in the network dataset is pointing to the same length fields? You can use the network identify tool (second icon from right on the NA toolbar) to inspect the values of individual edge elements. Check if the values being returned are same as the length field that you have. ALSO, do you have some scaled cost barriers or turn delays or junction impedances, etc that could add to the overall length of the path? If everything is ok, then you have to use the Copy Traversed Source Features tool to generate the lines, junctions and turns that make up the route. If it all looks ok, then I suggest you contact tech support for them to look at your data. Jay Sandhu ... View more

hi, Did you first export the routes layer to be a separate layer ? because routes layer is temporary and running calculate geometry may lead to misleading results. Also as i see, calculated length is always less than route length, so it suggests that calculate geometry may not be doing it for the whole route. just check again after exporting the routes to a permanent file. regards, Routes may be "temporary"...but they are real features. They are in-memory. And you can run calculate geometry on them. If you know of any cases where you get misleading results then please let Esri tech support know so that we can fix such an issue. And calculate length cannot do partial feature lenghts. If it encounters problems then it should give some warning or error message. Regards, Jay Sandhu ... View more

The route is computed by minimizing an impedance attribute and then returning the sum of that impedance. What is the impedance attribute that you are using the solve the route? Is it based on the same length field that will be used when you calculate geometry? Do note that the calculate geometry is based on the current projection of the data. One way you can double check is to calculate geometry on the original street feature class and then compare it to the legnth impedance attribut you used. Are they the same? Most likely they will not be the same. Another thing you can do is to run the first route pair, then use the GP tool (assuming you are using 10.1) CopySourceTraversedFeatures and it will generate a new line feature class from the route that shows all the individual streets and their length impedances. Also I am a bit confused where you say you want to generate multiple paths between 1000 OD pairs and then you are using the route solver on the first set...are you trying to find all paths, that is 1000 by 1000 matrix? If yes, then you can use the OD Cost Matrix solver to do that. Jay Sandhu ... View more

You can do a couple of things: Select only the streets for levels 1 to 3. Create a feature layer from the selection. Now symbolize each layer with different color and see if you can visually see some gaps between the lines Use Nicole's suggestion, but first write out the selected level 1 to 3 lines to a new feature class, make a network on it and then run the service area for a large value with the Lines option (not polygons). Does the service area cover all the lines? Jay Sandhu ... View more

Most likely the streets coded as level 1 to 3 are not fully connected. According to the online help at: http://resources.arcgis.com/en/help/main/10.1/#/About_network_analysis_with_hierarchy/004700000057000000/ It states:[INDENT]If the highway is disconnected, the route solver does not descend to the local street and connect. Instead, an error is returned. ArcGIS assumes that the highest order of hierarchy is connected. [/INDENT] Also note that hierarchy is useful for long distance routes in very large networks. If you do not have a large street network then you should not add or use hierarchy. Jay Sandhu ... View more

What is grayed out? the BA extension? The network analyst Make route analysis layer type of tools? If it is the latter, you need to add some street network dataset like the streetmap to ArcMap to make them active. Jay Sandhu ... View more

From the NA toolbar, make sure the NA window is active. Create a new route analysis layer. In the NA window, right-click the Stops to Load Locations to load your points. Bring up the properties of the route layer and on the analysis tab click on the Reorder Stops to find optimal route. Solve. I will really suggest that you use the NA tutorials to learn more about NA. Especially the following: http://resources.arcgis.com/en/help/main/10.1/#/Exercise_3_Finding_the_best_route_using_a_network_dataset/00470000005w000000/ Jay Sandhu ... View more

Thank you very much for you answer. Now i have next question for you. Can i use tihis expession  [SLength]*60/3000 in this analyses Where 3000 is pedestrian walks 3km/h Best Regards Alesger The expression is fine. But as Srirama pointed out, 3 Km / hour may be slow unless you know that is the speed at which your pedestrians are walking. Normal walking is 3 miles an hour or 4.8 Km per hour. So you could change the 3000 to 4800. Jay Sandhu ... View more

yes, you can use speeds from 2.5 to 4 km/hr.  the 1 mile/hr seems to me is for a crowded area. regards The previous expression was 3 miles per hour and NOT 1 mile per hour. Note it was multipled by 3. Jay ... View more

Your data is not projected.  So follow these steps: Add this data to ArcMap. Then, right-click on the Layers in the table of contents and choose properties. Click on the Coordinate System tab and then choose an appropriate projection for your data. (e.g. Asia South Albers Equal Area). Click OK. Now right-click on the data layer and open the attribute table. Right-click on the FT_METERS field and choose Calculate Geometry. Now you can pick Length and Meters unit, click Ok.  This will update the FT_METERS with the length in meters for each edge. Do the same with the TF_METERS. Now you can use the Field Calculator to update the FT_Minute and TF_Minute by using the FT_METERS and additional information such as speed limits, etc. Also note, your data looks like Open StreetMap data, so make sure to use the AnyVertex connectivity when you create your network dataset. Jay Sandhu ... View more

I want to ask you, what does it mean this number 26.8224 in this expression ? Looks like an expression to set up walk times. That number, 26.8224 is the number of meters you can walk in 1 minutes if you are walking at a rate of 1 mile per hour. That is, one mile is 1609.34 meters and then divide by 60 will give you 26.8224 So the expression  [SLength] / (3 * 26.8224) is calculating the walk time if you can walk 3 miles an hour where the SLength happens to be in meters. Jay Sandhu ... View more

What operation are you doing and when and what error message do you get? Jay Sandhu ... View more

The OD Cost matrix does NOT give direct/aerial distances. It computes the network shortest paths. But, for performance, it does not return back the route geometries of the path taken and simply draws a straight line to indicate the pair for which the network cost is computed. It is designed to return a matrix of distances. If you need to get the route geometries as well then use the Closest Facility solver. It does what OD does but also returns the route shapes. Make sure to set the number of facilities to find to the number you have (destinations) as the default is to find 1. Jay Sandhu ... View more

You can use the OD Cost Matrix to compute distances between two sets of locations. Here is a link to a tutorial that you can run through to see how to use Network Analyst for that purpose: http://resources.arcgis.com/en/help/main/10.1/#/Exercise_5_Calculating_service_areas_and_creating_an_OD_cost_matrix/004700000060000000/ Jay Sandhu ... View more

You should model it as a parameterized restriction. At solve time you can set the height of the vehicle and then the restrictions will be used appropriately. Read more about it here in the section titled "Parameters for modeling vehicle characteristics": http://resources.arcgis.com/en/help/main/10.1/index.html#/Using_parameters_with_network_attributes/00470000000s000000/ You can also look at how this is done in the tutorial network dataset for San Diego which has a height as well as length restriction with parameters. Jay Sandhu ... View more