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This is my first question, but I solved problems before thanks to this great community!

It is also my first time working with a network analysis (ArcMap 10) and there are some problems which haven't been solved until now. Maybe you can help!

I have bus stops and Streets (with length, slope, time from-to for a pedestrian (2.5 km/h)).

I want to figure out from which point a person in a village can reach the bus stop within 5, 10 and 15 min. ( I did an ESRI tutorial about this topic, and actually it shouldn't be so difficult, but the tutorial data was well prepared) At first I don't want to add slope restrictions. I just want to generate polygons around the bus stops with 5,10 and 15 min.

The result is quite weird. It seems that some streets have been analysed but others haven't been. (see screen)

All roads are connected and they have no further restrictions so i wonder why they are not displayed in analysis.

Thanks for your help and ideas!

enter image description here

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Are the streets one-way? – dmahr Jan 31 '12 at 19:43
no they aren't! But see below, maybe its solved! – Hannes Bl Jan 31 '12 at 22:21

1 Answer

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Is your streets layer planarized? Meaning that there is a node at every intersection of a road? If not Network Analyst will not recognize that a turn can be made from one road to another. Make sure your roads are planarized and then rebuild your network dataset.

Hope this helps,

Tyler

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Wow thanks for the quick answer! It took me some time to planarize, but i think it helped! What is more, I fixed an calculating-error concerning the pedestrian_time. See the screenshot - I think the problem is solved! Maybe. I will analyse the result tomorrow in detail. Thanks a lot! Hannes students.uni-marburg.de/~Blitza/busstop_solved_maybe.jpg – Hannes Bl Jan 31 '12 at 22:20

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