Guide Polygon Question

je512

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Hello, I'm new to the field of GIS, so forgive any incorrect terminology/concepts. I am wondering if there is a way to take two overlapping polygons (A & B) on a map and calculate the coordinates of the third polygon (C) that is comprised of the area in which they overlap? I've drawn a diagram to illustrate my question. And if it is possible, is this a trivial sort of operation or a pretty complicated one - as far as automating it to occur in numerous instances?

Thanks and let me know if I can clarify!

Polygon Question.PNG
 

Philip

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What software are you using?
 
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je512

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I'm not using any particular software. I'm more wondering if it can be done by any software and with how much effort? I'm open to any specific software.
 

CodeMacabre

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You could definitely use the GRASS toolbox (installed with QGIS); there's a v.overlay command to do exactly this task, but I haven't actually used it myself. Read up on it here: http://grass.osgeo.org/grass74/manuals/v.overlay.html

Alternatively, I think you could probably do it with the built-in geoprocessing tools in QGIS. In the menu go to Vector > Geoprocessing Tools > Intersect geometry. Read more here: https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html?#qgisintersection

Failing that, there's such a massive library of extensions and plugins for QGIS, I'm sure there's one that would be able to automate it; there are a number of geometry processing tool and plugins, that might help. Take a look at MMQGIS or Topology Checker.
 
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je512

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You could definitely use the GRASS toolbox (installed with QGIS); there's a v.overlay command to do exactly this task, but I haven't actually used it myself. Read up on it here: http://grass.osgeo.org/grass74/manuals/v.overlay.html

Alternatively, I think you could probably do it with the built-in geoprocessing tools in QGIS. In the menu go to Vector > Geoprocessing Tools > Intersect geometry. Read more here: https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html?#qgisintersection

Failing that, there's such a massive library of extensions and plugins for QGIS, I'm sure there's one that would be able to automate it; there are a number of geometry processing tool and plugins, that might help. Take a look at MMQGIS or Topology Checker.
Thanks for these tips! I'll read up on all of them. Open to any other comments people have on the question. Appreciate it!
 
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