Problem dealing with service area analysis

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09-11-2017 04:58 AM
G_shashiReddy
New Contributor II

Dan_Pattersonmitchh3001_jianhttps://community.esri.com/community/gis/analysis/network-analyst?sr=search&searchId=4adf3259-df94-4...

Can any one help me with this problem

I was performing Service area analysis, but I am facing this problem, the buffer is getting created along only one street. So plz help me solve this problem.

Adding to this I am also facing another problem saying

Warning: Location Facilities" is on a non-traversable network element position.@

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19 Replies
DanPatterson_Retired
MVP Esteemed Contributor

Buffer is small, so not unexpected

What are the restrictions on the routes and intersections?

Are some overpasses?

I suspect if you unravel the above, the error will be revealed

G_shashiReddy
New Contributor II

sir, The buffer I gave is of 2000mts, sir if there are any overpasses, then is it good to take them off.

Sir, Do you think whether there is any problem related to making a Network dataset. 

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JoeBorgione
MVP Esteemed Contributor

 Location Facilities" is on a non-traversable network element position

Your answer is in the error itself:  check the network connectivity of the line segment on which the facility has been placed.  It's probably not connected.  It appears to be on a freeway or some sort of limited access highway: when building a network, the underlying data on such features can be problematic.  Oneway values and connectivity issues will kill an analysis quicker than than anything else.

That should just about do it....
G_shashiReddy
New Contributor II

Sir I doing this for Bus Rapid transit, where the buses are in the middle of the road. So can you give me any suggestion for it. 

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JoeBorgione
MVP Esteemed Contributor

Start here:  Network elements—Help | ArcGIS Desktop ;  it goes on to:Understanding connectivity—Help | ArcGIS Desktop 

Don't forget this:  Designing the network dataset—Help | ArcGIS Desktop 

Finally;  download this tool from Tim Witt‌ : https://community.esri.com/thread/193584-topology-addin-guinea-pig-wanted   It will make discovering dangles in your network easier to find.

That should just about do it....
ChrisDonohue__GISP
MVP Frequent Contributor

It is most likely the lack of connectivity. I'd run topology to see what is going on.

Also, another potential issue is it appears there are spaces in some of the folders and file names.  Use underscores or get rid of the spaces, otherwise processes may fail (and unfortunately in these cases there is no error message that directly refers to the spaces).

"Network Analysis = 1% Analysis + 99% Data Cleanup"

Chris Donohue, GISP

JoeBorgione
MVP Esteemed Contributor

"Network Analysis = 1% Analysis + 99% Data Cleanup"

^^^^This along with a quote that Vince Angelo‌ likes to use,   The nice thing about standards is that you have so many to choose from.are pretty much are life rules to live by.....

That should just about do it....
G_shashiReddy
New Contributor II

Sir I doing this for Bus Rapid transit, where the buses are in the middle of the road. So can you give me any suggestion for it. As you all mentioned I tried with a fewer number of roads, but the result is same. Can you please suggest me a method where I can work.

JaySandhu
Esri Regular Contributor

You say buses are in the middle of the road. What does that mean?

The reason you are getting a small polygon is because your facility is located on a non-traversable edge (as reported in the warning). THIS means that the edge on which you placed your facility is NOT connected to any other edge. So you are getting a buffer along the road edge on which you placed the facility. Reducing the number of edges will not do anything. You have to fix your data. Looking at the included picture I see the word "OSM". So I am assuming you are using Open Streetmap data. Did you create the network dataset with Anyvertex connectivity as OSM data is not the default edge connectivity?

I will suggest that you use the OSM toolbox to create the network dataset:

https://www.arcgis.com/home/item.html?id=4533407decd94428817a228cb36964cf 

Jay Sandhu