topic Re: Polygon Boundaries Edges Issue in ArcGIS Pro Questions

Polygon Boundaries Edges Issue

deleted-user-1_r2dgYuILKY — Thu, 02 May 2019 18:17:36 GMT

So I have a public schools boundaries feature. The boundary of one polygon has a sharp, roughly a 90 degree angle edge. The adjacent boundary has a rounded edge. This seems to be happening mostly within street intersections. I'm left with a little pyramid in between that isn't inside any boundary. Is there a good programmatic topological method to force the rounded edges to snap to the sharp edges and get rid of the gaps? There are thousands of instances of this in my data.

Re: Polygon Boundaries Issue

deleted-user-1_r2dgYuILKY — Fri, 24 May 2019 19:07:04 GMT

Still trying to figure this out.

Re: Polygon Boundaries Edges Issue

KoryKramer — Fri, 24 May 2019 20:06:13 GMT

Have you looked into using the Integrate tool? https://pro.arcgis.com/en/pro-app/tool-reference/data-management/integrate.htm

Caution:

This tool modifies the input data. See Tools that do not create output datasets for more information and strategies to avoid undesired data changes.

Re: Polygon Boundaries Edges Issue

deleted-user-1_r2dgYuILKY — Fri, 24 May 2019 21:38:52 GMT

I tried using the integrate tool. It worked to close the gaps between the boundaries, but it also shifted the feature class by about a foot and a half, which is the distance of the gap between boundaries. I have the integrated copy stacked on top of the original as illustrated in the photos.

Before Integrate:

After Integrate:

Re: Polygon Boundaries Edges Issue

KoryKramer — Fri, 24 May 2019 23:46:00 GMT

Are these features all in the same feature class? Is there any way to split out those with the rounded corner from those with the square corner? That way, you should be able to leverage the rank to specify that the rounded corner should move to snap to the square corner.

Re: Polygon Boundaries Edges Issue

deleted-user-1_r2dgYuILKY — Tue, 28 May 2019 15:58:16 GMT

Yes, it's all one feature class that we later dissolve into elementary, middle and high school boundaries. Is it normal for the integrate tool to bump features?

Re: Polygon Boundaries Edges Issue

KoryKramer — Tue, 28 May 2019 18:58:26 GMT

Yes, in the Usage section of that documentation I sent (https://pro.arcgis.com/en/pro-app/tool-reference/data-management/integrate.htm)

If there are any input features selected, this tool will execute only on those selected features.
This tool performs the same kind of work as a topology in that it moves features within an x,y tolerance and inserts vertices where features intersect. Consider using a topology to perform this type of operation because a topology allows you to specify rules and conditions about how features relate to each other.

It says that the tool will execute only on selected features - would there be any way for you to select just the features with rounded corners?

Re: Polygon Boundaries Edges Issue

deleted-user-1_r2dgYuILKY — Wed, 29 May 2019 21:14:06 GMT

I tried only selecting the feature with the curved boundary, and it still moved the selected feature about 1.5 feet away from the coincident boundary:

Re: Polygon Boundaries Edges Issue

JoeBorgione — Wed, 29 May 2019 21:25:43 GMT

What if you use Map Topology to make sure all the edges are properly shared? Integration has always been a 'buyer beware' sort of operation for me....

Re: Polygon Boundaries Edges Issue

deleted-user-1_r2dgYuILKY — Wed, 29 May 2019 21:36:33 GMT

I don't have much experience using topology. Can I only fix one error at a time? There are thousands of instances of this in the data, which would take hundreds of hours to fix manually. I need a way to snap all of the curved edges to the 90 degree edges all at once.

Re: Polygon Boundaries Edges Issue

JoeBorgione — Wed, 29 May 2019 22:04:06 GMT

Well.... I guess it's up to you as to whether or not you want your boundaries topologically correct. I didn't realize you had so many errors, but the only way to get experience in something is to give a try. Just be sure you back everything up before hand. (I assume you did that before experimenting with integrate, right?)

At any rate, you can build a set of topology rules such that your polygons not have gaps or overlaps; often times if you set your tolerances right, the validation process takes care of a lot of errors. Start here and good luck

Re: Polygon Boundaries Edges Issue

deleted-user-1_r2dgYuILKY — Wed, 29 May 2019 22:19:36 GMT

Yeah, I messed around with setting up a topology for this. I could identify and fix errors, but only one by one. If there isn't a way to fix muItiple errors at once, we're going to have to just live with them or completely redraw them from scratch, which is less than ideal. I have no idea where these errors came from, because I'm dealing with boundaries that were created and edited long before I took this position.

Re: Polygon Boundaries Edges Issue

JoeBorgione — Wed, 29 May 2019 22:26:18 GMT

It's all a balance: how critical is topology for these features? At what scale are the errors noticeable? Will the errors send a student to the wrong school? How many districts are you talking about re-creating? How long will it take? These are questions only you can answer....