Polygons Boundaries

Pierre-LucBoivin — Tue, 02 Aug 2011 13:53:15 GMT

Hi,

I would like to create boundaries from a polyline shapefile and have only the exterior limit of this area. I made a buffer to convert my polyline to polygon but I'm not able to clean all the holes and gaps in it.

I've try many apps like Hawth's Tool, Et GEoWizard but I didn't found the function to be able to do what I want. The only extensions I have is Network Analyst

Here some screenshots of my steps and the result I'd like to have.

Thanks for your help

Re: Polygons Boundaries

DanLee — Mon, 08 Aug 2011 23:01:15 GMT

If you have ArcGIS 10 and an ArcInfo license, you can try the Eliminate Polygon Part tool (Data Management toolbox - Features toolset), which allows you to remove contained parts/holes.

Also, Feature To Polygon tool (Data Management toolbox - Features toolset) produces polygons from lines and/or polygons. Since your final polygons represent some classifications, you can try the following:
1. Select the lines or buffer polygons of the same class;
2. Run Feature To Line to get polygons (spaces surrounded by lines or polygons will become polygons);
3. Run Dissolve tool to remove interior boundaries.
4. Repeat 1 - 3 for each class. Then Merge or Append them together.

It might be necessary to write a script or build a model to do this in a loop/iteration. You may still end up having holes/spaced between classes. I am not sure which class those spaces should belong to. You will need sort that out.

Hope the above helps to some degree.

Regards,

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Polygons Boundaries

Re: Polygons Boundaries