Latest Contributions by JaySandhu

As I mentioned previously: "So you could select all the highways and then select all the junctions that fall on them and use that as your destinations" In ArcMap, top level menu there is a Selection drop down that has the option to "Select by Attributes" and "Select by Location". So add both the street and the junctions to Arcmap. Use the "Select by Attributes" and select the streets of type highways from the streets attribute table. Then use the "Select by Location" and do a spatial selection of selecting from the junctions that "intersect the source layer" of selected highways (click on the Use Selected features option). Jay Sandhu ... View more

To get to a highway, which is a polyline, you have to get to the closest end of that line. The ends are point feature class and available in the system junction feature class that is automaically created when you create/build your own network dataset. So you could select all the highways and then select all the junctions that fall on them and use that as your destinations for finding the distance from multiple origins to the closes highway. Jay Sandhu ... View more

When you save locations to disk, they are saved with the location information for that particular network dataset. These network location fields have information on the edige id's, percent along, etc. When you re-load them again later the default is to load them using existing network locations. This is much faster but it assumes that you are still using the same network dataset and have not edited or re-built it. To avoid this problem, Click on the "Use Geometry" instead of the "Use Network Location Fields" on the Load Locations menu and things should work fine. Jay Sandhu ... View more

When you create a network dataset, the wizard looks at the attributes present and if it detects some time or speed information, it will add a drive time attribute as well. You can add your own and they will show up with the name you give it. For example you could have DriveTime, TravelTime, Minutes, etc as three different time based impedances and you can choose from one of them when solving. To answer the question of where is it comming from, you can bring up the properties of the network dataset and click on the attributes tab. It will show you the name of all the attributes present in your network dataset. Click on the Evaluators button on the right side and then select the drive time attribute from the drop down at the top. The "Value" column will show where the information is comming from. It may be a field or an expression. If it is an expression then click on the first row to select it and then click on the "Evaluator Properties" button on the right to bring up the Field evalutator and you will see how the driveime expression was derived. Jay Sandhu ... View more

The problem is the polylineZ. Arcmap returns back a 2-d coordinate on the screen where you clicked and Z is 0. Since it is trying to locate that on a real 3-d line it finds one with a "lower" elevation closer to it. So that is why it appears to locate somewhere else. For 10.1 we have changed this behavior to make a better decision on where to locate. In the meantime, workarounds in 10.0 SP3: Change/convert your input street data to 2D by dropping the Z coordinate and rebuild your network. Or, Use real 3D point coordinates in a feature class and then use the AddLocation tool to add them to the route layer as stops. Jay Sandhu ... View more

It could be a problem with the spatial reference or spatia index, etc. What is the coordinate system of the data and units? What is the format of the data: shape file or geodatabase? If you use regular Identify and Select tools, do they work correctly? Also, is the street data in polylineZ or 3d format? You can open the attribute table and see in the shape column if it is 3d or not. Jay Sandhu ... View more

Unfortunately there is no way to call that .net addin button from arcpy. For 10.1 we have added a new GP tool called Copy Traversed Source Features and that can then be called from arcpy. You can consider joining the beta program for 10.1 if you need to use that functionality. Jay Sandhu ... View more

Can network analyst actually do anything, instead of just trace? Network Analyst can do a lot of things BUT it does not perform trace. You have this forum, dedicated to the Network Analyst extension, confused with geometric network and utility network analysis such as trace. Try posting your question in the geodatabase forums and you may get a better response. Jay Sandhu ... View more

i am trying to just create a network from a streets file i have from clatsop county and add the distances. Are you trying to use the Streetmap data as is (it has a network already built) or are you creating your own? And what does it mean to "add the distances"? Jay Sandhu ... View more

Its not clear from your last post if the slow down on the larger case (30 million) was during the solve or in writing out the results to disk. Solving the OD is quite fast but populating the OD lines feature class with 30 million rows can take some time! Generally if you are doing very large OD, then you should consider solving it via a standalone .net/arcobjects program to solve and not generate the OD lines but directly access the OD matrix object and write the distances to a disk file. Jay Sandhu ... View more

The geometric network needs to have a geometric network added to ArcMap to be active. It is not a licensed toolbar and has nothing to do with the Network Analyst extension. The Network Analyst extension works with Network Datasets primarily for transportation problems. The geometric network is for utility (electric, sewer, pipeline) type of applications and you use the Utility Network Analysis toolbar with them. Read more on them here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/What_are_geometric_networks/002r00000001000000/ Jay Sandhu ... View more

What version of the StreetMap USA are you using? Jay Sandhu ... View more

You can use the Copy Rows tool in the Data Management Table toolbox to write out rows to a new table. Jay Sandhu ... View more

What is the size of your Lines in the OD layer? That can give an indication to how long it may kae to write it out. But 9 hours does seem quite long. As you wait for the write to happen, is the layer file size growing? That is, is something being written out? The other choices you have to write things out is that you can save the Lines to a feature class (shape file or gdb) or you can also open the attribute table and save that (dbase or in a gdb, etc). Jay Sandhu ... View more

Since the error message states that no destinations were found for the origin points that means you have connectivity issues with your network. These can be due to topology problems with the data, restrictions, barriers or unpopulated impedance attributes. Have you tried running a Route between two locations to see if you can find a path? What is the source of your network? Jay Sandhu ... View more