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Service area generation with OSM shapefile

JavadRouzafzoon

Hello,

I need to create a network dataset for generating service areas based on Kilometres and Travel time.

I am using ArcMap10.5, Educational licence. I have downloaded two shapefiles for two countries from

GEOFABRIK // Downloads

Then, I used Merge tool and output was a feature class. So, I exported it to Single shapefile. I created a network dataset and for "Length" attribute, I chose "Shape" as "Value" in "Elevators" window.

When I create service areas, they are not correctly generated.

Do I have to do anything with the shapefile before creating network datasets?

Thank you!

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JoeBorgione

Often times free, online data is great for making maps and little else. In your case the data is not of high enough quality to perform the desired task. I suggest you gain some basic skills such as database and feature class creation and especially editing and then move on to tackling more advanced issues like network analyst. By the way, you are not using a Geometric Network, so to answer you question, no, Dan did not mean the Geometric Network Editing tool bar.

With a street centerline network, the biggest problem is connectivity or lack there of. Take a look at this thread: Topology AddIn Guinea Pig wanted . My friend and colleague Tim Witt‌ developed a terrific tool that finds dangles in feature classes post haste. I suggest that you use it on a small subset of your data and get a feel for what it takes to build a solid network.

Before you go too much further though, start here: About the ArcGIS Network Analyst extension tutorial—Help | ArcGIS for Desktop

MedianHHIncome.jpg

JavadRouzafzoon

Hi Melinda,

I tried to install the tool, but unfortunately, I got this error when opening ArcMap.

"Could not open the specified file "

I googled it, I could not find a solid solution.

DanPatterson_Retired

You can't... there is no geometry associated with them. Find out which features they are supposed to be and see if they are within your study area. If you were using a featureclass or shapefile, I would suggest that you use Check Geometry then Repair Geometry to see what is left that is good

Melinda Morang

Try using this tool to clean up the OSM data prior to turning it into a network dataset.

ArcGIS Editor for OpenStreetMap | Overview

JavadRouzafzoon

I faced these errors, but I thought they should not have a major impact.

SourceName: SwedenFinlandRoutes, ObjectID: 109550, The feature's geometry has zero length.
SourceName: SwedenFinlandRoutes, ObjectID: 149600, The feature's geometry has zero length.
SourceName: SwedenFinlandRoutes, ObjectID: 653582, The feature's geometry has zero length.
SourceName: SwedenFinlandRoutes, ObjectID: 990506, The feature's geometry has zero length.
SourceName: SwedenFinlandRoutes, ObjectID: 2011469, The feature's geometry has zero length.

Can I fix them somehow?

DanPatterson_Retired

Then there is a big break in the network and/or other possible errors during the build process

JavadRouzafzoon

I tried the test.

The route does not solve.

How can I correct the data?

Is there any other open route source data available?

Should I try with other file types from the OpenStreetMap?

Thanks

DanPatterson_Retired

Did the suggested test work?

Any file used for network analysis really needs to be cleaned up for this purpose. I am sure if it has worked for others, then it is probably pretty good. If the suggested test passes, then there is something wrong with your parameters used to set up the network. If it fails, then the network file has 'issues'. Do the test before worrying about anything else.

JavadRouzafzoon

Data is directly from OpenStreetMap, Is there any modification in OpenStreetMap shapefile required before using it in Network Analyst?

Thanks

JoeBorgione

...but only one very small service area is created...

Try this: create a route interactively by adding a stop point at one of you preferred locations, and another at a spot outside the service area shown. If the route does not solve, get ready for some major editing in your source data. If it does solve, your set up is the problem.

JavadRouzafzoon

Hi,

Here are images of the creation process and result.

As it can be seen, I chose to have three 50, 100, and 150 Km service areas, but only one very small service area is created.

Also, if I choose the location by search tab instead of " Add Network Locations" button, no polygon even is created. Generated Network Dataset Defining Service areas Service area result

DanPatterson_Retired

show an image of the result. It may not be what you expect... or did you get an error?

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