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I'm looking for a software that could assist me in defining geometric shapes over an existing image, define a scale, and display the length and areas of various elements.

For example, let's say I have this picture:

enter image description here

This is a contrived example, because the scale is already known in this specific case, and I would certainly use a GIS for this, but this serves just as an illustration.

I would like to be able to define the scale using the known dimension of a tennis court, then define a polygon over the pool, then compute its area.

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    Do solutions have to work on GNU/Linux and Mac OS X, or is one of these OS sufficient? – unor Sep 25 '14 at 15:15
  • It sounds like you are in the business of making pools? Am I correct? – adib Nov 12 '16 at 7:21
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I think this post in StackOverflow may help serve your purpose.

Open Layers measure example to calculate distance or area on a map.

You could also use MAPfrappe and GMap-Pedometer or Google Planimeter

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  • Could you elaborate a bit more on this this? Did you use it? What are your experiences? We like our recommendations to be full fledged personal experiences rather then just a bunch of links and "this could work". – Angelo Fuchs Apr 7 '15 at 10:47

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