Latest Contributions by JaySandhu

‎04-20-2012

Few things to do: Are you running ArcGIS 10.0? If you have a machine with 64 bit OS then you can use ArcGIS 10.0 on that for it to use up to 4 GB RAM. As far as the 13,000 OD even with 2.5 mile cutoff can be quite large, how about solving this in smaller chunks? Divide the origins into four sets of 3250 each and then solve four 3250 by 13000 OD's and combine the results? If that is still too large, divide further! Jay Sandhu

‎04-20-2012

Is this the entire code or is there more? Does the m_objRouter object exist by the time you are calling the NetAttributeName method on it? Jay Sandhu

‎04-20-2012

You could be running of memory. You can bring up the task manager and see how memory is being consumed to see if that is an issue. How far apart are your facilities and incidents and how many are you solving for. Do you have the hierarchy turned on? Can you split the problem into two and solve? That is, load in only have the incidents and solve. export the results and then load the second half of the incidents and solve, export and combine the results? Jay Sandhu

‎04-20-2012

First of all there is no way to tell the OD compute one-half of the matrix, that is, just A to B. Second, how many origins and destinations do you have for this solve? By any chance, does your network datset have hierarchy and it is set ON by default, then, if you are usinga 2 mile cutoff, set the hierarchy to OFF and the performance will increase. Note that hierarchy helps when you have long distance routes, but not when you have small cutoff's like 2 miles. Jay Sandhu

‎04-05-2012

Make sure you followed the instructions here when setting up the registry keys for ArcGIS 10.0 http://support.esri.com/en/knowledgebase/techarticles/detail/38426 If the keys are in the right plance and they have not worked, then set the PolygonChunkSize to 1 and re-run. This will tell it to solve each facility and write out results befoe moving on the the next one. Jay Sandhu

‎04-03-2012

Since you are doing a simultaneous 60 minute service area from 150 locations with the Merge option, that means it has to generate all the 150 service areas to merge them together. In that case the registry entries to chunk them in polygons of 5 will not work. You could choose the overlapping option and then merge the polygons later if needed (e.g., using Dissolve tool). Jay Sandhu

‎04-03-2012

First, what version of the software are you using and how much RAM do you have on the machine. Second, are you solving a 60 minute drive time from one location or multiple locations? Generally speaking, larger service areas may not work due to memory limitations but 60 minutes is not that large and should succeed. Also, what settings do you have on the polygon generation: generalized/trim/merge/etc. Also what DWORD did you change/edit using regedit? Jay Sandhu

‎03-26-2012

How do you create the VRP layer? Also, if you bring up the properties of the VRP layer what is the impedance attribute set to? Jay Sandhu

‎03-26-2012

If the goal is to find a shortest path without any restrictions, turns, etc, you could build a geometric network and then use the utility network toolbar to find a path. Do note that the main purpose of this solver for trace tasks in the utility industry but it will get you a shortest path without using network analyst. More info here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Finding_the_shortest_path/002r00000037000000/ Jay Sandhu

‎03-26-2012

Is the solve not working on particular set of locations? Do other locations work? How long does it run before you get the solve failed? For example does it take a while and perhaps runs out of memory for some reason? Jay Sandhu

‎03-22-2012

It's not straight forward to do this as you in a real marathon course, you need to have permissions on roads to close, have enough width, avoid certain places, go by some historic landmarks, avoid interstates, etc. Given that, you can imagine plopping down some points in a circle of circumference 26 miles (or a circle of radius 4 miles) and on the route layer properties turn on "Reorder stops to find optimal route" and un-check the preserve first and last stop and solve. Look at the length of the route returned and if not 26.2 miles, add some more stops to get the desired length. Jay Sandhu

‎03-22-2012

Generally the maximum speed is handled by computing the travel time of a road based on its specified max speed. So the route solver minimizes the overall travel time. If you have a vehicle that travels at 5 miles per hour even on a 35 MPH road, than you can compute the travel time on all the roads in the network based on 5 miles per hour and then solve the path. Or you could set up a parameterized attribute where at run time you specify the speed of the vehicle and the travel time for each edge is computed at solve time (slow performance). You can read more about parameterized attributes here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Network_analysis_with_parameterized_attributes/00470000005m000000/ Jay Sandhu

‎03-22-2012

A number of geographical analysis such as for transportation planning (demand forecasting), spatial interaction, accessability studies also known as gravity models depend on first computing distances between a set of locations. OD is the first step for such analysis. A number of analytical tools such as the Traveling Salesman Problem, Vehicle Routing Problem, Location-Allocation also start with first computing the OD and then look for a solution. OD can be computed and exported for use in third party Linear Programming packages for solving any type of optimizing problem. One such demonstration is the Allocation Tool that you can access here: http://resources.arcgis.com/gallery/file/Geoprocessing-Model-and-Script-Tool-Gallery/details?entryID=C4E79AE3-1422-2418-88B2-008CC5F9D24F Jay Sandhu

‎02-08-2012

If you use the GUI to solve then generally messages are displayed in the status area (bottom left) of ArcMap. Other thing you can do is to make sure to turn on all message reporting. To do that, use the Network Analyst toolbar drop down and selet Options and click on All Messages. Now messages may be shown in a popup window after the solve. You can see how to set the options here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Network_Analyst_options/004700000044000000/ Jay Sandhu

‎02-07-2012

Most likely you have connectivity issues. To check that, create a service area solver and bring up its properties. On the Line Generation tab, turn on Generate Lines and on the Polygon Generation tab, turn off Generate Polygons. Now place a facility location where you have your first stop in the route and solve. It will show where the connectivity issues occur. Jay Sandhu

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Date Last Visited	‎05-29-2026 01:54 PM

My Ideas

Latest Contributions by JaySandhu

Re: Economizing OD Cost Matrix when A->B = B->A

Re: Routing Problem

Re: Closest Facility Won't Draw Routes?

Re: Economizing OD Cost Matrix when A->B = B->A

Re: No Service Area Polygons Generated for Larger Areas

Re: No Service Area Polygons Generated for Larger Areas

Re: No Service Area Polygons Generated for Larger Areas

Re: A question regarding an error message

Re: Shortest route

Re: Solve Failed?

Re: ESRI streetmap data for distance calculation.

Re: Max Speed

Re: OD Cost Matrix Analysis Applications

Re: Solve Failed?

Re: Can't find route when there are overlapping lines (which are valid)

Re: Creating a maximum walkshed around each point

Re: Closest Facility - Remove Facilities and Incid...

Re: Polygons for Best Dump Site By Site Cost and T...

Re: Delay in routes

Re: Delay in routes