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Thx Jay, I think I have located it....let me do this again at my end and will write back if I have further questions. Deb
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09-15-2011
11:48 AM
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Joe, Thanks a ton for taking a look at my data. I know that vast majority of the roads have 0 minutes but the roads surrounding the county centroids have some value in the minutes field. If you just try with 5 minutes then you will see that most of the county centroids have a service area around them except for Caldwell and Hayes. Hayes is not on the network so lets ignore it. For Caldwell, it is generating the service area across whole of Texas. And as you pointed out, is it because of the edges with zero minutes?? I just saw a few of them near to the County Centroid named Caldwell. Do you know of any road network dataset for Texas which will have the minutes for all the edges?? Then I can use that to get the service area with time as impedence. Once again, thanks for your inputs.....:) Deb
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09-14-2011
07:01 PM
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Joe, thx for your insights...i agree that the service area will not be circular in the true sense but what i meant by concentric circles is basically a region around the centroid with a travel time of 5, 10 or 15 min. But if you see the attached diagram, a 15 min travel time selects the whole of Texas. Am not sure where am i going wrong...i have followed the standard steps as in the Tutorial. I am new to Network Analyst and am not sure where to start checking.....I can guess there is some problem with the network data but don't know what..:).... thx Deb
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09-14-2011
08:42 AM
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Hi All, I am having some similar problem: 1) I need to find the service area within 5, 10, 15 minutes of the county centroids. When i solve that with the create new service area tool of network analyst it doesn't give the correct answer (it selects the whole state of Texas for some of the points which is wrong. It should create concentric circles around the county centroids with regions at 5, 10, 15 minutes from those points). 2) I am having the same issue with the cities too. When I try to create a service area within 3 hours from San Antonio, Austin, Houston and Dallas it selects the whole of Texas. In fact it should create a circle around the city with areas within 3 hrs from it. The data is at the following site: http://kbdi.tamu.edu/SHRP2/Projected/deb.zip I am attaching a screenshot for this. i would greatly appreciate if you could kindly look into the matter and get back to me at the earliest.
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09-14-2011
05:59 AM
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