Latest Contributions by JaySandhu

Network Analyst will provide driving directions for a route that you solve. However you need to make sure the data for the streets and your bus routes (intermediate stops) needs to be available. I will suggest that you install the Network Analyst tutorial data and run through the tutorial exercises to get famillar with these capabilities. Jay Sandhu ... View more

Given that error message, check if you have any stops loaded for that route context. Jay Sandhu ... View more

Finding an OD for 1650 points should be very doable. When does it fail? Any error messages? How much memory do you have in the machine? How far apart are the points and do you have hierarchy in the network and using that? If it is running into memory issues, then I would suggest reading this article: http://resources.arcgis.com/content/kbase?fa=articleShow&d=30637 Set an OriginChunkSize of 200 for your case and re-run it. Regards, Jay Sandhu ... View more

Martin, Given that you are trying to set up a distribution system, a minimum spanning tree would be the best solution. You can always export the output routes of the closest facility solver into a feature class, use topology to create vertices where the lines cross each other and then build a network dataset on that with anypoint connectivity. Perhaps that might give you what you need. There is no MST solution in the core ArcGIS product, but you could write your own. Perhaps this user contributed script could help as well: http://arcscripts.esri.com/details.asp?dbid=15121 Regards, Jay Sandhu ... View more

Cedric, I think TD here is not generating all nodes to all nodes OD. I believe he has discrete locations that he wants to use as input. So comuting distances from any location to any location is not as straight-forward as all nodes to all nodes type of algorithms you see in CS books. Also, as the Network Analyst already has this solver implemented why re-invent the wheel but concentrate on other things.  Your point on clustering is well taken as 40k by 40 k matrix will be very large and MATLAB will not be able to take the whole thing in. But then TD has not specified if he wants to use the whole matrix or some small part of it for further data mining. Jay Sandhu ... View more

Given your needs, I am not sure if you need a minimum spanning tree. You have a central station and consumers and want you want to route from the station to all consumers. Can you be more specific? Is this one route that starts at the station and visits the consumers or is one route per consumer from the station. If you want to do the first, that is, start at the station and visit the consumers in the best possible way, then the solution is called a travelling salesman problem. You can use the Route solver (in Network Analyst), load you station as the first stop, your consumers as next set of stops and then bring up the route layer properties and on the Analysis tab, Click ON the "Reorder stops to find optimal Route" and un-check the preserve last stop. Solve. If you need to do the second option, i.e. paths from station to consumers, use the Closest Facility Solver, load your station as the facility and the consumers as incidents and solve. You will get one path per consumer to station. You can set the travel direction from the facility or to the facility as needed. Jay Sandhu ... View more

There is no "clean" coverage processing tool in ArcGIS as now the native format is a geodatabase. You can use "topology" to "clean" your data. Also you may find the following article helpful: http://resources.arcgis.com/content/white-papers?fa=viewPaper&PID=87&MetaID=1068 Regards, Jay Sandhu ... View more

The service area solver does not have such an option. You could use the GP overlay tools such as erase or intersect get the desired polygons after computing the service area. Jay Sandhu ... View more

Creating a geodatabase: Start ArcCatalog. Navigate to the location you want to create the geodatabase. Right-click in the folder and choose New and then File Geodatabase. Give it a name. May I ask what will you be doing with the 1.6 Billion distance pairs you plan to compute? Jay Sandhu ... View more

Adding a location from a multi-point for a Service Area Layer only loads in the first point. It does not load all the points in the multi-point. If you need to load multiple points, then load them from a point feature class with multiple point features. Jay Sandhu ... View more

40,000 by 40,000 is quite large. One way to tackle this is to create an OD Matrix Layer, set the output shape type to none (why bother creating straight lines is all you want is distance) and load these 40,000 locations as destinations. Then in a loop do the following: select the first 100 destinations, load them as origins, Solve, Write out the results to a file geodatabase table. Remove the 100 origins and repeate this for the next 100. So basically do a 100 by 40000, 400 times. You maybe able to 200 by 40000. If you have the ArcGIS 10 pre-release, you could run this on a machine with at least 4 GB of RAM and 64 bit OS (windows 7 or vista) then you can run larger problems. Also in ArcGIS 10, if you upgrade your network dataset and dissolve it with a new tool, you will get better performance. Regards, Jay Sandhu ... View more

There is no way to join sub networks into a bigger network without copying the underlying features into a new feature dataset and building the entire network. As Joe mentioned, in version 10, there is capability to track edits by dirty areas and then the build will do an incremental re-build of the network. Also the network build algorithm has been improved to be much faster than before. To use these new capabilities, you will have to upgrade the network dataset to a newer format. There are tools to do this upgrade. Regards, Jay Sandhu ... View more

You can open the streetmap mxd and then click on the + or ADD button. Browse to where the streetmap data is stored, scroll to the bottom and you will see a Streets network. Add that to ArcMap. Now the network analyst toolbar will be active. If you go into the streetmap folder with explorer, you will see a Streets.RS file that contains the definations of the network dataset based on SDC data and the streets.rsx folder contains the binary files for the network. So there is no "NDS" file for SDC data. Hope this will be enough to get you started. Regards, Jay Sandhu ... View more

Why can you not use the streetmap network directly with Network Analyst to create the service areas? There is no need to "cut" the data into smaller areas and then try to create network datasets on it. Simply add the streetmap network to ArcMap, create a service area layer, bring up it's properties and on the Analysis tab switch to Length in miles instead of the time in minutes, add your location and solve. If you have extracted the data and want to add a length field, then you can use the field calculator. See more on this at: http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Making_field_calculations Jay Sandhu ... View more

with 45 minute service area around 50 to 60 facilities you are most likely running out of memory. I would suggest that you either reduce the number of facilities OR use "chunking", that is solving the problem in chunks by setting a registry key to instruct the software to do this. You can get the details on how to enable this by the following article: http://resources.arcgis.com/content/kbase?fa=articleShow&d=30760 Regards, Jay Sandhu ... View more