[Qgis-user] delete overlapped polygons

[Randal Hale]

I believe you can do it this way (as I'm experimenting with this very 
thing). Of course - if you have very small polygons with even smaller 
polygons this wouldn't work.

Select features using an expression and let your expression be $area < 
square units you are looking for.

I wanted to select everything in my layer less than 10 acres (I am 
working in Feet) so I entered $area < 435600 and have quite a few 
polygons selected now. I am checking to make sure it has done what I 
wanted.

Hope this helps - I'm pretty sure there is a more elegant solution than 
$area - but so far this works for me.

Randy

On 04/19/2015 12:38 PM, Giacomo Fontanelli wrote:
> Hello forum
>
> this post is similar to my last one, but not totally the same.
>
> Thank you for making me know the Sieve filter.
>
> I have a vector layer.
>
> I have some polygons that apparently seem to be lying on bigger 
> polygons and totally included on this, but if you delete the small 
> ones they produce holes on the big polygons with the same dimension 
> and shape of the small polygons.
> Well: this is the result I'd like to obtain, I mean I would like to 
> automatically delete the smaller polygons producing the described holes.
>
> How can I do this?
>
> Thank you very much
>
>
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-- 
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
twitter:rjhale     http://about.me/rjhale
http://www.northrivergeographic.com/introduction-to-quantum-gis

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