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I plan to use for positioning and tracking of areas worked for underwater mining.

I am trying to draw rings using Rectangles Ovals Digitizing plugin.

But there is very little info available.

  • do you have a centre and radius? – Ian Turton Jan 3 '18 at 17:18
2

Consider also using "Geometry Generator" which contains functions make_circle() and difference().

Pasting this expression difference(make_circle($geometry, 100), make_circle($geometry, 50)) will lead to achieving the desired result, see image below.

example


References:

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1

You have the tools to create buffers in QGIS, create the first, then the second one from one center and different sizes, and then cut the smaller one...

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0

Besides the solution with "Geometry Generator" which intended to provide a visual solution, nevertheless, it is possible to achieve rings as completely new polygon layer using "Geometry by expression" geoalgorithm from the QGIS's Toolbox.

Pasting this expression difference(make_circle($geometry, 100), make_circle($geometry, 50)) into 'Geometry expression' will lead to achieving the desired result, see image below.

result

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0

Possible by means of the "Multi-ring buffer (constant distance)" geoalgorithm from the QGIS's Toolbox.

example

Afterwards, choose the required rings, others can be easily deleted.


References:

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