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Posted by Alfred E Newman on December 6, 2005, 2:09 pm
Please log in for more thread options Routeware is a very good place to start. Read, Read, Read.
After that, read everything yu can find on ESRI.
@f14g2000cwb.googlegroups.com:
> Hi,
>
> I need to digitize/vectorize a street network from a scanned raster in
> ArcGIS, I have some queries regarding the way I should mark road
> centerline polylines so that it stays topologically correct and can be
> used by a routing algorithm.
>
> 1) what rules govern creation of an entirely new polyline object or
> just adding points when there is an intersection with 'another'
> link/street. I mean if you have 'abc road' which is a spans a distance
> of 200 metres, but is contributed to by some minor streets at 3-4
> places from both the left and right side it. Should I create seperate
> polyline objects, all called abc roads...? ( I hope I'm not being
> rather vague..) I understand that my problem is not unique and there
> must be some resource on the net which can explain the process with
> some real examples?
>
> 2) what is the best way to store attribute information such as
> direction of flow of traffic (if the road is 2 way or one way..) should
> different layers be used for this or the same layer with attribute data
> attached to it?
>
> I've been referring to GDF specification and trying to get a hang of
> how 'real' road networks work..but I will be glad if i am pointed to
> some more resources on this.
>
> Thanks
> Suraj
>
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