topic Re: How to turn polylines into polygons (arcmap 10.2) in Mapping Questions

How to turn polylines into polygons (arcmap 10.2)

SimonLaughton — Fri, 10 Aug 2018 09:50:24 GMT

I am hoping some expert here can save me a lot of time!

I have been supplied some mapping which was created in CAD and exported to dwg.

We are working with ArcMap 10.2.

I have added the dwg file in, however quite a number of what should be polygons have come in a Polylines. They look like Polygons, but on zooming in I can see they is a tiny area on each which isn't quite complete.

For my purposes I need them to be Polygons. I have had a google and can see that there is a method to convert lines to polygons, but I think this only applied in newer versions of arcmap.

To save me tracing each polyline (there is a lot!) is there a way I can turn these polylines into polygons, autocompleting the small section that is missing?

Thank you!

PS - I attach an image with a red circle to show the issue!

Re: How to turn polylines into polygons (arcmap 10.2)

CarmelConnolly — Fri, 10 Aug 2018 13:36:23 GMT

Hi Simon,

The function Construct Polygons looks like it's available in 10.2 - ArcGIS Help (10.2, 10.2.1, and 10.2.2)

Is this the tool you're referencing or different?

If you've got an Advanced license, the Feature to Polygon might help too: ArcGIS Help (10.2, 10.2.1, and 10.2.2)

Carmel

Re: How to turn polylines into polygons (arcmap 10.2)

SimonLaughton — Mon, 13 Aug 2018 08:36:55 GMT

Thank you for your reply.

It looks like the Construct Polygon tool only works for line features which are already fully complete (ie no gaps). All of the polylines I need to turn into polygons have tiny gaps and so are not complete.

I almost need an “autocomplete to polygon” tool.

Over the weekend we upgraded from 10.2 to 10.4, but I do not seem to have the Feature to Polygon tool. Perhaps I do not have a licence advanced enough for that.

Thank you!

Simon Laughton

Graphic Designer

01626 215765

Simon.laughton@teignbridge.gov.uk<mailto:Simon.laughton@teignbridge.gov.uk>

PLEASE NOTE MY WORKING HOURS AT 8AM to 1PM, MON, WED, THUR, FRI.

Re: How to turn polylines into polygons (arcmap 10.2)

CarmelConnolly — Mon, 13 Aug 2018 09:45:50 GMT

Hi Simon,

Another workflow is suggested here: convert line to polygon in ArcGIS - Geographic Information Systems Stack Exchange although the Feature Vertices To Points—Data Management toolbox | ArcGIS Desktop tool requires an Advanced License also.

If you don't have an Advanced License, you could use Generate Points Along Lines—Data Management toolbox | ArcGIS Desktop instead (Make sure to use an appropriate distance that will help keep the line/polygon shape). This tool create points along each line and associated the ID of the line to them.

Then run Points To Line—Data Management toolbox | ArcGIS Desktop and in the Line Field use choose the ID field. #

Then you can proceed to the Construct Polygon tool.

Carmel