topic Re: How to batch match polygon edge? in Geoprocessing Questions

How to batch match polygon edge?

XingboChen — Wed, 07 Jun 2017 15:01:24 GMT

Here's an example, the two polygons below have no gaps or overlaps, but the nodes on the shared edges are not exact the same, how can I make them have same nodes? And I've got like more than 50 thousands polygons in a feature class like that, is there any tools to get it done?

Re: How to batch match polygon edge?

AbdullahAnter — Wed, 07 Jun 2017 16:22:59 GMT

The main problem here that there are many uncritical vertices in most edges.

So I think you can try use Simplify Polygon tool (Arc toolbox > cartography tools > Generalization >Simplify Polygon ). And make Simplification Algorithm is POINT_REMOVE.

POINT_REMOVE—Keeps the so-called critical points that depict the essential shape of a polygon and removes all other points. This is the default.

Re: How to batch match polygon edge?

DuncanHornby — Thu, 08 Jun 2017 13:51:48 GMT

I explored your approach and it does not work, see example below. Whilst keeping the shape and removing some of the vertices it does not remove all of them.

A similar question was asked on GIS SE here. There is a generalize tool on the topology toolbar, you can select up all polygon edges and click on that, it worked very well on my simple test data, but not sure how it would fare with 50,000 polygons?

Re: How to batch match polygon edge?

AbdullahAnter — Thu, 08 Jun 2017 18:03:04 GMT

Duncan, you find another method good job. But I wondered that you said that Simplify Polygon doesn't work. and your link is approve this tool too. did you read carefully ?. may be that you don't defined Simplification Tolerance well. I think you defined small tolerance so not all vertices deleted.

Re: How to batch match polygon edge?

DanPatterson_Retired — Thu, 08 Jun 2017 18:50:56 GMT

Run an experiment... run a Check Geometry on the file that you have shown with your pattern... then export that to a new file and report if there are any differences. What you are seeing is the result of merging polygons from different data sources or not using the 'autocomplete polygon' tool when creating the polygon pair in the first place

Re: How to batch match polygon edge?

AbdullahAnter — Thu, 08 Jun 2017 20:47:31 GMT

Yes , Dan I agree with you except 'autocomplete polygon' , because it will be the first place if there one , two or three polygons , but Xingbo Chen says :

And I've got like more than 50 thousands polygons in a feature class like that

Re: How to batch match polygon edge?

DanPatterson_Retired — Thu, 08 Jun 2017 21:28:44 GMT

Abdullah... I was just pointing out the source of the error... in case they have to create their own data at some stage.

Re: How to batch match polygon edge?

XingboChen — Fri, 09 Jun 2017 06:10:23 GMT

Yes, I got it. But I'm not the one who produced the data and I need to fix the error.

Re: How to batch match polygon edge?

XingboChen — Fri, 09 Jun 2017 06:16:12 GMT

Thank you very much, Simplify Polygon works, I set a very very small tolerance like 0.00001 meter.

Re: How to batch match polygon edge?

XingboChen — Fri, 09 Jun 2017 06:23:39 GMT

The tool Abdullah Anter mentioned is in the arctoolbox, the tool you mentioned is on the advanced edting toolbar (Arcgis 10.4). And both of them work by setting a very very small tolerance like 0.0001 meter, I got what I wanted. But I prefer the one in the arctoolbox since I've got too much polygons.

Re: How to batch match polygon edge?

XingboChen — Fri, 09 Jun 2017 06:28:04 GMT

Here's my earlier example after I run the tool.

Re: How to batch match polygon edge?

DuncanHornby — Fri, 09 Jun 2017 09:25:55 GMT

Abdullah, I tried setting the tolerance to very small, even what Xingbo used (0.00001 meter) but I still get some vertices left after the Simplify Polygon has been run. The tool on the toolbar seems to work for me, removing all vertices except for the ones that the boundaries share. I was able to select all polygons and run the tool on them, but my sample is much smaller than Xingbo's. Anyway Xingbo seems happy!

Re: How to batch match polygon edge?

XanderBakker — Fri, 09 Jun 2017 12:15:34 GMT

Just an additional suggestion... did you look at the Integrate—Help | ArcGIS Desktop tool?

Re: How to batch match polygon edge?

XanderBakker — Fri, 09 Jun 2017 12:30:48 GMT

Just did a simple test on a very messy sample dataset:

In my case I used a large tolerance (25m):

...and that does not only change the matching borders, but also the rest of the polygon.