[Qgis-user] Overlapping

[Harrissou s.]

Hi,
A starting point can also be the Processing "overlaps analysis" algorithm [0] (sorry I don't know how the output actually looks like) followed by some aggregate analysis.

[0] https://docs.qgis.org/testing/en/docs/user_manual/processing_algs/qgis/vectoranalysis.html#overlap-analysis

Regards,
Harrissou

Le 11 février 2022 17:58:00 GMT+01:00, chris hermansen <clhermansen at gmail.com> a écrit :
>Michael and list
>
>On Fri, Feb 11, 2022 at 8:49 AM Michael Williamson <
>michael at michaelandjane.org.uk> wrote:
>
>> I am sure this is easy but I can’t work out which facility to use
>>
>>
>>
>> I have two layers. Layer A is made up of some large polygons while Layer B
>> is made up of smaller polygons. The Polygons in Layer A overlap one or more
>> of the polygons in layer B. In most cases the overlap is 100% but there are
>> a few cases where the overlap is less than that.
>>
>>
>>
>> Layer B contains population and other data as numerical attributes and I
>> want to populate corresponding attributes in layer A with the weighted
>> total of the attributes in layer B depending on the amount of overlap.
>>
>>
>>
>> I have found various tools but I cannot work out which one to use. The
>> ones I have found seem to do part of the job but not all of it.
>>
>>
>>
>>
>> Probably you want
>
>Vector > Geoprocessing Tools > Intersection
>
>That will give you a new layer C with the geometric intersections of your
>Layer A and Layer B.  The attribute table for Layer C will contain the
>attributes of both A and B.
>
>
>-- 
>Chris Hermansen · clhermansen "at" gmail "dot" com
>
>C'est ma façon de parler.
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