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Thanks Jay Sandhu, yes that solved the problem! Most of the errors related to "one-way" restrictions on the Route Layer which was easily corrected. However, I had a tough time trying to save results and had to repeat the procedure several times before I could manage to do it. The file size increased from 180MB to about 550MB. I have about 70,000 stops, and more than 30,000 routes. Is that normal? I agree, ideally I should have mastered this extension before I made this an important part of my dissertation. Its an important, but small part.... hoping to learn along the way, and these ArcGIS forums are very useful! Thanks again for the help! Regards, Sweta
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08-31-2011
12:38 PM
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If I understand your objective correctly, you want to find the driving distance from one specific origin to one specific destination, not from all origins to all destinations. This is important because, at first glance, you might think the OD cost matrix solver would work best, but actually it's probably best to do the following using a route layer instead: 1. On your dataset, create a new field named RouteName and calculate its value so that it is the same value as your current ID field. 2. Add your origins to ArcMap as a layer. (Tip: File > Add Data > Add XY Data.) Only specify the origin X and Y fields. 3. Rename the output layer that appears in the table of contents to something like Origins. 4. Add your destinations to ArcMap as a layer. Only specify the destination X and Y fields. 5. Rename the output layer to Destinations. 6. Make a Route layer using the Network Analyst toolbar (or a GP tool). 7. Load the Origins layer into the Stops class. (Tip: Right-click Stops in the Network Analyst window and choose Load Locations.) Make sure the RouteName field is mapped to the RouteName field you created. 8. Load the Destinations layer into the Stops class using the same method. 9. Solve By specifying the route name when loading, the stops are grouped together and routes are calculated only for the stops that are in the same group, which in your case is limited to a single origin and destination pair. You can open, and optionally export, the Routes class, which contains the calculated shortest-path driving distances. The Name field values will match the values of your original IDs. Hi, thank you Robert Garrity and Jay Sandhu for step-by-step guidance to this query. I followed it, but for some reason only some of the O-D pairs are solved. My data set has more than 35,000 trips, or pairs or OD points, but only 5700 were solved. I get two kinds of error warnings, the samples are below: 1. Warning: Location "Location 11" in "Stops" is on a non-traversable network element position. 2. Warning: No route for "9901" from location "Location 9902" to location "Location 47260" What is want to do is find the shortest route between each pair of O-D points on each of these trips. The data has been obtained from a travel survey using GPS that gives X,Y coordinates for each origin and each destination for each trip. I think in my case, all the street center-lines have been identified as edges, however, all OD points not falling directly on the edges are showing up as errors and not able to snap to closest edge/street. Any help will be appreciated! I am new to Network Analysis and this forms a critical part of my doctoral thesis! Thanks, Sweta
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08-25-2011
03:00 PM
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Hi all, I have a similar query. I need to calculate the shortest network distance (driving distance) between a set of Origins and a set of destinations from a travel survey. I need to also built in constraints like one-way, no U-turns except on dead ends, speed limits, etc. Please let me know how this can be done. I have more than 10,000 trips for which I need to calculate driving distances. This is part of my dissertation research. Any help and tips would be appreciated! Thanks, Sweta Byahut
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07-10-2011
07:27 AM
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Hi, I am new to Spatial Analyst but have to use it extensively for my dissertation research. I am using ArcGIS 10. I have a query. I have about 2600 buffer areas of half mile each, most of which overlap, in one shape file (each buffer area is a polygon) and I have another layer with different land use classifications. I want to generate a table with detailed land use areas for each of the buffer areas, something like this: AG COM SF MU MF IN HI ..... ...... buffer area1 buffer area2 buffer area3 .... ... ... buffer area2600 Any help and suggestions will be appreciated! Sweta
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03-10-2011
06:46 AM
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