[Qgis-user] (re)colloring overlapping parts of multipolygons

[Alexandre Neto]

Hi Richard,

Are you looking for something on the fly? Or you can run some analysis?

Alex

A sábado, 19/06/2021, 15:54, Richard Duivenvoorde <rdmailings at duif.net>
escreveu:

>
>
> Hi List,
>
> I'm experimenting to create 'flower'-shaped polygons for a point layer,
> denoting the signal coverage of several directional radio transmitters on a
> pole (fyi: to find/locate bats with small transmitters).
>
> After some fiddling I came to the attached result for a point with 3 (but
> dynamic from attribute) transmitters using the following expression:
>
>  collect_geometries(
>  array_foreach( string_to_array("azimuths"),
>  make_circle( make_point(
>                 $x + "bereik_m"/2 * cos(radians(@element)),
>                 $y + "bereik_m"/2* sin(radians(@element))), "bereik_m" )
>                 ))
>
> The result being a multipolygon with overlapping parts.
>
> In this work the overlapping area'a are (apparently) the most interesting,
> as there the 'location' accuracy is highest.
>
> So my question: is there a way to give the overlapping area's really
> different colors.
> I've been playing with the layer rendering options, but ideally the area's
> in which there is no, 2 parts, 3 parts, and 4 parts overlapping should be
> differently colored..
>
> I could try to create more advanced expressions (or probably I would go
> for some python) for that, but I was hoping maybe there is another
> trick/idea to use current multi-polygons, without adding 'parts'
>
> Any help/tip is appreciated.
>
> Regards & TIA,
>
> Richard Duivenvoorde
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