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Thread: Create Routes Problem

  1. #1

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    Default Create Routes Problem

    I've been trying, without success, to create a set of routes from a bunch of line segments. The CreateRoute tool will read the line segment shape file and create a route layer however the routes which are created are a bit of a mess. The original line segments are discontinuous and occasionally at one of these discontinuities in the created route the route will change direction - I assume it's reverting to the digitised direction of the original line segment, though I'm not sure.

    I don't have any measure field for the line segments so I'm allowing ArcGis to use the length as the measure source and specifying the coordinate priority. The length is also strange. For example, when I created a point route event layer I was able to create and plot points at lengths of over 20 km on a line which was only 17.5 km long. The Event at 8 km also appeared approximately 200 metres away form the Event at 2 km.

    Anybody have any idea what's going on? Because I'm stumped. Usually I have clean data sets to work with but this one landed on my desk as a pile of MapInfo files and I'm getting nowhere with it.

  2. #2
    Grant Hopkins
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    Default Re: Create Routes Problem

    [QUOTE=RayMcGowan;110568]I've been trying, without success, to create a set of routes from a bunch of line segments. The CreateRoute tool will read the line segment shape file and create a route layer however the routes which are created are a bit of a mess. The original line segments are discontinuous and occasionally at one of these discontinuities in the created route the route will change direction - I assume it's reverting to the digitised direction of the original line segment, though I'm not sure.

    I don't have any measure field for the line segments so I'm allowing ArcGis to use the length as the measure source and specifying the coordinate priority...QUOTE]

    Hi there,
    I think I can speak to your first issue with the Create Routes tool. When using this tool it won’t necessarily take into consideration your digitized direction. Instead it will either use the From and To Measure sources (Measure Source = Two Fields) OR the Coordinate Priority (Measure Source = Length) as where to start the route and end it.

    So as a work around I believe you will either have to have From and To measures for each line segment and make sure they are accumulating for each proposed route.

    OR

    You could run the Dissolve tool and dissolve on the route ID, then create a From and To field on this intermediate layer. Use field calculator and make all the From measures = 0 and make all the To measures = [Shape_Length]. It is important that your digitized directions are in the order you want for each line segment for this intermediate step. Now take this layer and create a route from it using the Two Fields option. NOTE* This process will work for discontinuous roads/segments provided they share a start and end node. I can’t figure out how to make this work for multipart routes (i.e. roads that end at a cross section and then start up after a short jog to the left or right down a cross road).

    I hope this helps,
    Grant

    P.S. Any input from you or anyone would be appreciated.

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