topic Re: Create Polygon from Features in ArcMap Questions

Create Polygon from Features

AmeliaNewsam — Fri, 24 Apr 2020 19:39:22 GMT

I'm trying to create a polygon from a continuous line feature, I've tried both Pro and ArcMap without success. Sometimes it says that it successfully created the poly, but it did not (nothing in Attribute table). Sometimes it says it failed. I've tried different tolerances and checked for any breaks in the line. Any ideas would be appreciated.

thanks.

Re: Create Polygon from Features

JoeBorgione — Fri, 24 Apr 2020 19:53:45 GMT

Can you elaborate with a few more details of your work flow?

Re: Create Polygon from Features

AmeliaNewsam — Fri, 24 Apr 2020 20:30:58 GMT

Hi Joe -- So I just upgraded to 10.8, and I was able to get one of the polys to happen, and I'm guessing the other one has topology issues. I tried to find Data Reviewer (On the main menu, click Customize > Toolbars > Data Reviewer.) but it doesn't appear in my toolbar search. I'm not super clear on how to run topology after the feature has been created... seems you have to set up the rules beforehand?

Anyway, here is a snapshot of the polylines, with the inner polygon having been successfully created. I really only need the donut poly, but couldn't get that to happen so thought I'd try to make two and then cut the bigger one with the smaller one.

Here's the error message: (I'm not sure what the part about overlapping the polygons means... ?)

Re: Create Polygon from Features

JoeBorgione — Fri, 24 Apr 2020 20:43:44 GMT

Data Reviewer is an add on extension; do you have a license for it? If so, you'll need to activate the extension in your arcmap session.

Are these contour lines or are you digitizing them by hand? Are you selecting existing lines and then converting them into a polygon? If that's the case, they must not be continuous. In ArcMap/ArcCatalog topologies are built in a feature dataset.

Re: Create Polygon from Features

AmeliaNewsam — Fri, 24 Apr 2020 21:02:59 GMT

I see, then I will add that on, thanks. I believe I do have authorization.

They were a mess of digitized lines, lots of little pieces that I had to edit and merge.

I'm confused by "they must not be continuous." I thought they had to be continuous? Also, the inner continuous line was successful... ?

Re: Create Polygon from Features

JoeBorgione — Fri, 24 Apr 2020 22:08:06 GMT

Arrgh! My BAD! Friday afternoon typo! Please accept my apologies!

Yes, you are correct; all the lines must be continuous. Are you absolutely 100% sure that the lines creating the outer polygon meet that criteria?

Can you try this: create the each polygon in a different session and without the inner present? That is, create a whole new feature class for the outer one. If your goal is a doughnut, you could then use the inner to erase the outer.

Re: Create Polygon from Features

AmeliaNewsam — Fri, 24 Apr 2020 22:18:03 GMT

No worries, I do it all the time.

No, I'm not absolutely sure they are continuous, which is why I was looking into the Data Reviewer tool. I will add that in and use it on the polyline, and then I will also try your suggestion of exporting into a new shapefile by itself.

Thanks for your help!

Re: Create Polygon from Features

AnalieArmendariz — Fri, 24 Apr 2020 22:24:54 GMT

Hey! a polygon is a vector file and you mentioned that your data is continuous. I would recommend using the raster to vector tool then creating your new feature class polygons!

Re: Create Polygon from Features

AmeliaNewsam — Sat, 25 Apr 2020 19:35:08 GMT

Hi Analie,

Oops, sorry, I guess I wasn't using the term correctly. I thought Joe meant continuous as in no breaks in the line. The input feature is a polyline.