[Qgis-user] delete overlapped polygons

[Giacomo Fontanelli]

Dear Randy


unfortunately the dimensions of the smaller polygons are very variable and
it's hard to apply your method.

I'm gonna try with GRASS or OTB or SAGA.

I will keep you in touch.
Thank you very much

Giacomo

On Sun, Apr 19, 2015 at 6:54 PM, Randal Hale <
rjhale at northrivergeographic.com> wrote:

>  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, Inchttp://www.northrivergeographic.com423.653.3611 rjhale at northrivergeographic.com
> twitter:rjhale     http://about.me/rjhalehttp://www.northrivergeographic.com/introduction-to-quantum-gis
>
>
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