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.

  • 1
    Do solutions have to work on GNU/Linux and Mac OS X, or is one of these OS sufficient?
    – unor
    Commented Sep 25, 2014 at 15:15
  • It sounds like you are in the business of making pools? Am I correct?
    – adib
    Commented Nov 12, 2016 at 7:21

1 Answer 1


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

  • 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". Commented Apr 7, 2015 at 10:47

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