[GIS] How to create a mask where the masked area can be changed by selection

maskingqgisselect

I'm working on making a mask in QGIS to have one area(county A) outlined while the other areas(counties) are under a semipermeable layer. I already know how to do this for one selected area.

But my question is now: Is it possible to create some kind of mask where I simply need to select the county of my choice and the rest is covered? And it would make it a lot easier if I could change between the counties for uncovering by selection without creating a mask for every county I want to highlight. Maybe somebody knows how to do this?

I hope my question is quite clear. If not I will try to be more specific.
Thank you for helping 🙂

Best Answer

you should gieve a try to "mask" plugin: http://plugins.qgis.org/plugins/mask/

You can either select by hand or query your objects. It takes them, dissolve them and create a hole in a square feature that is 4 times larger than select objects. It adds a semi-transparent memory layer to your project. If Memory layer saver plugin is installed, your project will keep thos layers. If not, you have to save it as shape or other..

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