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I have the task of inserting a polygon in a map with a specific size. My idea is to simply "draw" a polygon and keep on enhacing its size, until it reaches the size I actually want to be. Its basically an easy task, but i'm wondering if i could directly have the polygon in the size i want it to be. I went through the vector-tools, but nothing seemed to do the trick. I'm using QGIS 2.18.3 (Las Palmas)

  • what sort of polygon? size as length or area? – Ian Turton Sep 21 '17 at 12:05
  • area!The polygon doesnt even have to have a specific shape... – rtaani Sep 21 '17 at 12:06
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You can use QAD Plugin to draw a regular polygon with a specific area. For example, if you want to draw a polygon with an area of 50000 square meter you can do the following:

  1. Select regular polygon as you can see below: enter image description here
  2. Specify the number of edges at the command line below (I chose 6), and click enter enter image description here
  3. Specify Center of the polygon or Edge: clicked on target position on the screen
  4. Enter an option [Inscibed in Circle/Circumscribed about circle/Area]: Choose Area enter image description here
  5. Enter the polygon area: Choose the specific area you want, 50000 for example

enter image description here

  • This works! I'm still struggeling with the area, there is a gap between what i insert and what i calculate (for verification), but i'm sure its a small issue which is manageable! Thanks – rtaani Sep 22 '17 at 12:20
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    The QAD plugin is not compatible with v3.xxx – Eddie Arni Jan 11 at 19:19
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If it does not need to be QGIS have a try with OpenJUMP. With the Draw circle tool you can define the size and then create circles of fixed size with just one click.

enter image description here

  • Hi, Thanks for the quick reply. We dont have OpenJUMP at work. I will look into it anyway – rtaani Sep 21 '17 at 12:39
  • The normal Draw polygon tool shows the area in real time when you draw a new feature but unfortunately the other circle tool that is used by dragging the circle to the desired size shows only perimeter in real time. – user30184 Sep 21 '17 at 12:50

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