[Qgis-user] Intersection between vector layers

[Nicholas.Crosbie at health.vic.gov.au]

Thanks Noli.

The approach I took was (following a hint from Alex from "Wild Intellect") 
was:

1. to make a new shape file from my yellow polygon, (Layer > Save 
Selection as Vector file ...)
2. importing the new layer and placing the "dots" layer above the new 
layer, then
3. Vector>Research Tools>Select by location...   and follow the GUI 
instructions

This did exactly what I needed.

A great tool!

best regards,

Nick





From:
Noli Sicad <nsicad at gmail.com>
To:
Nicholas.Crosbie at health.vic.gov.au
Cc:
qgis-user at lists.osgeo.org
Date:
25/01/2011 03:18 PM
Subject:
Re: [Qgis-user] Intersection between vector layers



Hi Nick,

I think there are two ways to accomplish this,

1, Select the yelllow polygon using the "Select Features" tool then
Tools > Geoprocessing Tools > Intersect. Create a new shapefile in
"Output Shapefile" and "OK"

or

2. Using the "Select Features" tool again, Press Control button,
select all the points in inside the polygon and then Tools >
Geoprocessing Tools > Clip. Create a new shapefile in "Output
Shapefile" and "OK"

Noli



On 1/25/11, Nicholas.Crosbie at health.vic.gov.au
<Nicholas.Crosbie at health.vic.gov.au> wrote:
> Hi Noli,
>
> Thanks for your email.
>
> I attach the screen grab.
>
> The small circles (aka 'dots') are all on one layer.   Then there is
> another layer which displays adjoining polygons (this holds the
> yellow, selected, polygon).
>
> I want to select only those circles that are in the yellow (selected)
> polygon.
>
> How do I do that?
>
> cheers,
>
> Nick
>
>
> 
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