[Qgis-user] Spatial Join

[Randal Hale]

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, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
<mailto:rjhale at northrivergeographic.com>
twitter:rjhale
http://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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