Negative polygons within polygons

Andrew Rose's Avatar

Andrew Rose

30 Oct, 2019 04:53 PM

I am working on some mapping for new trainees at my agency. Within our larger jurisdiction are smaller blocks that aren't ours. How can I get these blocks to appear as a unshaded or negative polygon within the larger one?
Theoretical example attached: we would respond to the homes/neighborhood around Gaynor Lake, but the water itself isn't ours. I want the neighborhood shaded, but the water not.

  1. Support Staff 1 Posted by matt on 30 Oct, 2019 06:01 PM

    matt's Avatar

    Andrew -

    Sorry, but polygon inner rings are not presently supported. It's something we'd like to add, but supporting them across the board (drawing, editing, printing, area calculations, label placement, etc) is a tremendous amount of work with a number of higher-priority features like the app ahead of it.,

    At the moment, you'd have to either overlay another polygon of a different color (so that the area at least looks different) or draw a C-shaped polygon closed into an O, so that there's a connecting border between the outer perimeter and the inner hole.

    • Matt
  2. 2 Posted by Andrew Rose on 30 Oct, 2019 06:08 PM

    Andrew Rose's Avatar

    Thanks Matt.
    Good suggestion on how to get the look of this. Thank you and the Caltopo
    crew for all that you do. It's a great resource!

  3. Ben Lantow closed this discussion on 30 Oct, 2019 10:07 PM.

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