topic Re: Converting a polyline feature class to a polygon feature in ArcGIS Pro Questions

Converting a polyline feature class to a polygon feature

BrekenDavis — Wed, 11 Jan 2023 21:58:03 GMT

So I've been scouring the web and I can't seem to find out if there is a solution to a problem I'm currently trying to work around.

For some context, I am trying to utilize a service provider that has a mapping system built into their website. I thought that the service would be able to accept any type of shapefile upload into their mapping system, but it turns out they ONLY accept polygons and I've come to a road block.

The files I have are points and polylines and I am trying to see if there is any way to reconfigure them into a polygon feature class without having to completely recreate these lines and points from scratch.

Any suggestions?

Thanks

Re: Converting a polyline feature class to a polygon feature

DougGreen — Wed, 11 Jan 2023 22:41:23 GMT

You could use the buffer tool. It is going to create all sorts of overlaps though. You could use the buffer tool in the editing tools that allows for leaving square ends or only buffering to one side.

Re: Converting a polyline feature class to a polygon feature

BrekenDavis — Wed, 11 Jan 2023 22:56:31 GMT

Would this change the feature class so that when I save it, a file system will register it as a polygon (Shape type=5)?

Re: Converting a polyline feature class to a polygon feature

DougGreen — Thu, 12 Jan 2023 18:36:28 GMT

Well I'm not sure the file system would detect it but any software that consumes a shapefile would be able to recognize it.

Re: Converting a polyline feature class to a polygon feature

GregoryElwood1 — Thu, 12 Jan 2023 18:45:49 GMT

Hello Breken!

Buffers seem like they would work. Can you clarify what you mean by "service provider"? Does that mean service like a utility (gas, electricity) or an online, hosted Service like and ESRI AGOL Service?

Gregory

Re: Converting a polyline feature class to a polygon feature

BrekenDavis — Thu, 12 Jan 2023 19:24:16 GMT

Hi Greg!! Long time no see! Service as in Locator Logix, a Dig alert ticket management website.

Re: Converting a polyline feature class to a polygon feature

DougGreen — Thu, 12 Jan 2023 19:59:24 GMT

Oh ok. We have Digline in Idaho. What they want is one polygon to show any area within 50 ft of a utility such as the water system. In this case, I simply use the buffer geoprocessing tool with the "dissolve all" option so it produces one polygon.

Re: Converting a polyline feature class to a polygon feature

BrekenDavis — Thu, 12 Jan 2023 20:45:58 GMT

So I tried the buffer tool and set it to dissolve, then I used Feature to Polygon and Feature to Shapefile. It produced a new error stating "There are 1 invalid complex/self-intersecting polygons in the shape file."

So I used Repair Geometry and now I'm back to an error of "Unsupported ShapeType 25", but I've removed the M and Z values already.

Am I doing anything wrong?

Re: Converting a polyline feature class to a polygon feature

GregoryElwood1 — Thu, 12 Jan 2023 21:39:20 GMT

Sounds like you're doing it correctly. When I've had geometry or other errors when generating dissolved buffers I've done one of two things:

1. If possible, run the buffers on separate, individual portions of the existing geometry, then merge them.

2. Really drilled down in to the buffer polygon and look for small loops, crossovers and concentrations of vertices that get generated by the buffer geoprocessing tool and *hand edit* all those nasty little buggers out of the polygon. Takes forever but you can end up with a buffer polygon that's clean. The Buffer Geoprocessing tool doesn't correct for any less-than-ideal geometry in the source Feature Classes or shapefiles and in some cases can pass along or amplify geometric aberrations that may be present.

Re: Converting a polyline feature class to a polygon feature

BrekenDavis — Wed, 18 Jan 2023 17:38:46 GMT

So I think I finally figured it out and I can't thank you both enough for helping with your recommendations.

What seemed to work for me as a crude fix was Merging all the lines together before creating the Buffer. Then selecting only the Buffer outline and saving that as its own shapefile. Then I used the Feature to Polygon to finish it off. Unfortunately, I did lose the individual line data, but thankfully I don't need that information for this particular objective. This will certainly work for the near future while I wait for the Logix team to update their software.

You gotta love those 24 hour problems that take just 2 minutes to fix. 😅