[Qgis-user] Spatial Join
Randal Hale
rjhale at northrivergeographic.com
Thu Aug 8 05:12:52 PDT 2013
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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