Latest Contributions by JaySandhu

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

How many faciliies do you have in your service area layer? I am wondering if it is running out of memory. Jay Sandhu ... View more

Hi, while creating drivetime polygons, the Network Analyst gave me the error above. What does this mean? Thanks. This error message is masking the real problem. Most likely the service area failed due to some reason such as being too large or no edges traversed. What are your break values and what are the settings for the polygon generation. Perhaps you can turn on the Line Generation as see if any edges are getting traversed and then try to figure out why the service area failed. Jay Sandhu ... View more

Thank you so much for your help, Jay and Deelesh! I have another question though. I am using OD Cost Matrix for my task and I find out once you load your locations into either origins and destinations, they are assigned new attributes, which have nothing in common with the original points. I am just wondering is there any way I can keep some if not all attributes from the original point layer. I know on the map, they are two separated layers, I am thinking I could use spatial join, but I am afraid it would not help much. When you do a Load Locations, you have the option to map in some fields such as NAME. So you could map in a field to NAME and later use that to do a JOIN. However another thing you can do is after you create the OD Cost Matrix layer, open the attribute table of the Origins (or destinations) and Add Fields that you want to bring over from the original point layer. Now when you do a Load Locations, you will see your new fields listed on the analysis proprties and now you can map in these fields from the original point layer and load them as part of loading the point locations. Regards, Jay Sandhu ... View more

Your network seems ok. Though it is not clear what is "intersection". Is it a attribute that you added to the network? Perhaps you can use the "network identify tool", second icon from right on the network analyst toolbar to identify the edges and junctions. Also it is not clear what is "What I eventually want to produce" table. Can you describe what you want? Jay Sandhu ... View more