[Qgis-user] Spatial Join

[Jonathan Moules]

Hi Randal,
I had noticed the polygons to points converter, but wanted to do it
"properly" - i.e. with a polygons in polygons comparison.

Your method will likely work but adds two extra steps (conversion to points
and then from points back to polygons). Does QGIS not have a tool for this
then?

Thanks!

Jonathan


On 8 August 2013 13:12, Randal Hale <rjhale at northrivergeographic.com> wrote:

>  Here's how I would do it: You have Two polygon layers and you need to
> count the number of polygons in layer 1 that are contained in the polygons
> in layer 2
>
> 1. Convert the polygons in 1 to points: Vector -> geometry -> polygon
> centroids
> 2. then use -> vector -> analysis tools -> points in polygon. Count the
> number of points contained by polygons in layer 2.
>
> Hope that helps or at least creates an idea.
> Randy
>
> -----------------
> Randal Hale, GISP
> North River Geographic Systems, Inchttp://www.northrivergeographic.com423.653.3611 rjhale at northrivergeographic.com<mailto:rjhale at northrivergeographic.com> <rjhale at northrivergeographic.com>
> twitter:rjhalehttp://about.me/rjhale
>
> On 08/08/2013 07:36 AM, Jonathan Moules wrote:
>
> Hi List,
>    I have two layers of polygons. I want to do some analysis between them,
> basically doing a spatial join, counting how many of one polygon layer
> there are intersecting with each polygon in the other layer.
> ArcGIS does this easily with the "Spatial Join" tool (ArcToolbox version).
> How can I do this in QGIS?
>
>  I know there is Vector -> Data Manage Tools -> Join attributes by
> location, but that only acts as a basic join and doesn't allow for counting
> of the number of joins.
>
>  Sextante has a large collection of tools, but none of them seem to have
> any help so I don't know what any of them do. (And none of them seem
> applicable anyway).
>
>  Suggestions welcome, Cheers,
> Jonathan
>
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