Use Hierarchy

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04-23-2012 08:35 AM
jp
by
New Contributor II
Hi,

I am performing network analysis with the ESRI streetmap North America network dataset. If I change settings like the cost attributes or restrictions or any other Attributes the performance is fine. But when I uncheck 'Use Hierarchy' and run the analysis it runs for a while and gives error message 'Error - Out of memory'.

When I test with network datasets that don't have hierarchy the tool runs fine.

Any suggestions?

Thanks!
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13 Replies
jp
by
New Contributor II
Thanks Jay. I get better results with ArcGIS 10 data when compared to 9.3 and they match with google maps distances too.

I have another question.
Should the distance calculated by Route Analysis layer and OD Matrix layer match?

I've compared the results and gradually there is difference from 1000 mile routes on-wards.
With 9.3 data the variation starts from 200 mile routes.


Any thoughts?

Let me ask again: what version of the free streetmap data are you using?

Make sure you are using the version that came with ArcGIS 10. these files should be dated from 2010. You should not see this kinds of route with it. The older versions may not have good hierarchy information and you may sometimes get odd results.

You can always compare routes with "better" data. For example, in ArcMap, on the standard toolbar with the zoom in/out icons, there is a Find Route tool. You can use this tool to solve routes using data/service hosted on ArcGIS online using better street data. Help on this tool is here:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//007z00000002000000.htm


Jay Sandhu
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JaySandhu
Esri Regular Contributor
The results should match. Make sure you have the direction of the Route start and end in the same way as the origin to destination to compare the path length.
And also make sure the hierarchy is on or off in the same way between the route and OD solve and are using the same network dataset.

Jay Sandhu
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jp
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New Contributor II
I have checked all the settings and make sure all the properties match for route analysis and OD matrix analysis.

Any other suggestions?

Thanks
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JaySandhu
Esri Regular Contributor
If the network data, software, settings, locations are all the same between the Route and OD and you are getting such large differences then I suggest the next step is to contact Esri technical support and have them reproduce the issue.

Jay Sandhu
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