topic Create polygons that group certain number of points in ArcGIS in Geoprocessing Questions

Create polygons that group certain number of points in ArcGIS

SlobodanKomatina1 — Tue, 12 Jun 2018 12:13:01 GMT

I have about 20000 points and I want to create polygons where each polygon contain 200 points, so there should be 20000/200=100 polygons. I want to do that with ArcGIS 10.4.

Re: Create polygons that group certain number of points in ArcGIS

DanPatterson_Retired — Tue, 12 Jun 2018 12:19:03 GMT

What rules are you using for the grouping?

some possibilities...

split the points based on sequential number
spatially sort the points then group by sorted idea
group based on a distance (this is difficult because getting 200 exactly is nearly impossible, so you would have to iterate and subdivide.

Re: Create polygons that group certain number of points in ArcGIS

SlobodanKomatina1 — Tue, 12 Jun 2018 12:34:19 GMT

I just want these groups to contain 200 points and to touch boundaries like on the example bellow.

Re: Create polygons that group certain number of points in ArcGIS

SlobodanKomatina1 — Tue, 12 Jun 2018 12:53:49 GMT

So I guess that this idea is that what I need:

spatially sort the points then group by sorted idea

Re: Create polygons that group certain number of points in ArcGIS

DanPatterson_Retired — Tue, 12 Jun 2018 12:55:43 GMT

The quickest way to do that is to use the selector tool, highlight a selection that you have done, use the field calculator to put in a 'key' value (ie week1, week 2 etc).

In any event, you are going to have to draw the boundary. If you had to reuse this boundary, then you could produce the boundary layer, then do a select by attribute or spatial join.

If you need them as separate files, then use the Split layer tool if you and advance license... or since you are using an old arcmap Split Layer By Attribute works for all license levels

Re: Create polygons that group certain number of points in ArcGIS

DanPatterson_Retired — Tue, 12 Jun 2018 13:01:35 GMT

as for sorting, a standard spatial sort isn't going to help.

A radial sort around area centroids might help you identify the closest, but given your layout of the zones you are working with... you would be done doing it manually before you finished fine-tuning that.

I do have tools for radial sort but they are for ArcGIS Pro

This sounds similar to one of your other unclosed threads

https://community.esri.com/thread/206712-how-to-merge-adjacent-polygons-to-one-which-sum-of-attribute-values-is-between-10000-and-20000000

Re: Create polygons that group certain number of points in ArcGIS

XanderBakker — Tue, 12 Jun 2018 13:07:21 GMT

This related post might contain some additional relevant info: https://community.esri.com/message/687863-re-group-every-near-50-points-together?commentID=687863#comment-687372

Re: Create polygons that group certain number of points in ArcGIS

JoshuaBixby — Tue, 12 Jun 2018 13:40:59 GMT

Might be worth looking at Creating Polygons Based on Point Count in ArcGIS for Desktop? - Geographic Information Systems Stack Exchange

Re: Create polygons that group certain number of points in ArcGIS

SteveLynch — Tue, 12 Jun 2018 13:46:46 GMT

Generate Subset Polygons was launched in ArcGIS Pro 2.1

Re: Create polygons that group certain number of points in ArcGIS

SlobodanKomatina1 — Tue, 12 Jun 2018 14:00:54 GMT

Great! That works. Now I just want to create polygons that contain points based on attribute value of each point. Also I need these polygons just to touch boundaries, not to overlap each other.

Re: Create polygons that group certain number of points in ArcGIS

JoshuaBixby — Tue, 12 Jun 2018 14:17:50 GMT

Nice, I wasn't aware of that addition, will have to check it out soon.

Re: Create polygons that group certain number of points in ArcGIS

SteveLynch — Tue, 12 Jun 2018 14:43:42 GMT

also look at Mapping Clusters tools

Re: Create polygons that group certain number of points in ArcGIS

DanPatterson_Retired — Tue, 12 Jun 2018 23:36:49 GMT

sadly... 10.4 is being used

Re: Create polygons that group certain number of points in ArcGIS

KevinTaylorSpire — Thu, 03 Nov 2022 21:21:48 GMT

I think I found exactly what you're wanting. Generate subset polygons lets you set minimum and maximum constraints for number of points per polygon. They draw crazy and have almost no spatial connection, but it will divide up your points into polygons of equal number.