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I have round plots that include forest areas inside them (the picture is an example of one plot). I calculated the total perimeter of forest areas inside the plot. The problem is I want to exclude the plot boundaries that overlap with the forest.

Any ideas?

enter image description here

  • Thank you. but when I convert to lines those boundries the plot boundries are still there.I want to calculate the edge effect. I want to get rid of the boundries of the plot that overlap the forest polygon. in the picture- I want to get rid of the black lines.... does that make sense? ![enter image description here](i.stack.imgur.com/VpqSb.png) – naomi Jan 15 at 9:54
  • You could use Minimum Bounding Geometry to create a circle around your plot. Convert to line, Intersect or Clip with your plot and you will have the line length of the circle perimiter. Then subtract this from your original plots shape length – BERA Feb 14 at 11:30
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you could first convert the raster to polygons, then the polygons to lines, and finally intersect those lines with your plot data.

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You could convert your forest to vector (if it is currently raster data) and run the Erase geoprocessing tool, using your plots as the input and the forest as the erase coverage. Then, just recalculate the geometry of you plots on the output to get the area. One caveat though... this tool requires an Advanced license.

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