Access to facilities

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03-26-2011 09:53 AM
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New Contributor
Hi,
We are trying to model access to greenspace using a road network, for postcodes within 300m of access points to the greenspace. Firstly, would Service Area polygons be the most appropriate method or would you recommend Closest Facility? We have tried both methods, while trying to model service area, roads that are within 300m of the access point (visible by sight) are not being included, can you suggest some solutions? While trying to model closest facility, not all postcodes (incidents) are given a route to the nearest facility, even without a cut off of 300m.

Any guidance on this topic would be greatly appreciated!

Many thanks

charlie
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>while trying to model service area, roads that are within 300m of the access point (visible by sight) are not being included, can you suggest some solutions?

Are you using detailed polygon option? You may also want to set the trim distance to 10 meters instead of the 100 meters default as you are only doing 300m. If the road are still not being included, then you can bring up the service area layer's properties and on the Line Generation tab and turn on the lines. Solve again. This should show the lines that are allocated to your locations and the polygons should cover them.

>While trying to model closest facility, not all postcodes (incidents) are given a route to the nearest facility, even without a cut off of 300m.

Then perhaps there is something wrong in the street data that a path can not be found to what you think is the closest facility. Create a Route layer and try to find a path between your location and what you think should be the closest. And see if a path can be found. If not, perhaps you can use the Network Identify tool (second icon from right on the NA toolbar) and click on your edges to see if they appear to connect to each other properly.

Jay Sandhu
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