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I am trying to generate polygons around a series of lines to create a sort of coverage area for each separate group of lines. I've merged all the lines into a single feature for each category but all my experiments with converting them to graphics then to polygons fail.

Does anyone know a way to generate something like this?

Even if they are not perfect it would speed drawing a lot.

Line features

Below is my old manually created one. I am hoping there is a way to generate or get close to something like this to make updating it easier.

This is my old manually created one

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    Look at minimum bounding geometry tool, convex hull but set group by option to your category field. Commented Jul 8 at 17:30
  • You can also try Dissolving by your group attribute, then buffer the resulting multilines. Then you'll have to find a way of removing overlaps between groups Commented Jul 8 at 17:41
  • I'd use cost allocation Commented Jul 8 at 21:52

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What will probably work for this is creating Voronoi Polygons, also known as Thiessen Polygons, around your lines. This creates lines that go hallway between each group of lines, which are then used to create polygons. Here is the process for performing this operation in ArcGIS Pro.

  1. In Analysis -> Tools search for Generate Points Along Lines (Data Management Tools) and enter the input variables. For distance, be aware that smaller values result in more points, making the final lines more detailed but also more complex
  2. In Analysis -> Tools, search for Create Thiessen Polygons (Analysis Tools > Proximity) and generate polygons
  3. In Tools, search for Dissolve. Select the attribute feature to merge all adjacent polygons that share the same attribute value.
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