Esri Mapping Center - Ask a Cartographer

Clustering in ArcGIS 10

September 20 2011 | 3 comments
Categories: Map Data

With ArcGIS Server there is an option for Java Script API where we can use clustering representation and create a cluster for points close to each other. You can look at the example here: http://geochalkboard.wordpress.com/2010/09/09/clustering-with-the-arcgis-server-javascript-api/

I was wondering if such thing is possible in ArcGIS 10? Or if there is any way around that can create similar representation of points for normal maps?

Regards.

Mapping Center Answer:

Attached is a tool you can use to perform the type of analysis you are asking about. Hope this helps!

Attachment: Cluster Tool

thanks posted by gerd weitkamp on Mar 19 2013 5:57AM

That is a tool I was looking for. Great. Could you explain how the clustering is calculated exactly? And would it be possible to assign a cluster number to each point from the input layer? Thanks!

Collect Events posted by Aileen Buckley on Mar 19 2013 9:58AM

If you right click the tool in ArcToolbox and click Edit you can see what the model is doing -- essentially it is using the Collect Events tool to do the clustering.

Cluster number posted by Aileen Buckley on Mar 19 2013 10:10AM

I am not quite sure how you could assign a cluster number for the input to the output since the output is going to represent multiple input points, not just one. So how would you make the assignment -- what input point number would get assigned to the output point if, say, 5, input points are represented in the output point? I don't think this is possible, except maybe using a spatial join but then I am not sure what your results would be or what they would mean.

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