[Qgis-user] Getting landuse information for several circular polygons

[Manuel Spínola]

Thank you very much Simon.

That works, specially the second option.

What I am trying to do is a very common task in landscape ecology.  The
buffer could be considered a landscape for some species and some metrics
could be obtained for these "landscapes", however, I found this task kind
of difficult to do in QGIS.  Any input on this?  Is there any oriented
landscape ecology tutorial for QGIS.

Best,

Manuel

2012/7/16 Simon Cropper <simoncropper at fossworkflowguides.com>

>
> Manuel,
>
> Once you clip the layers, break the multi-part components apart use the
> following menu sequence "Vector > Geometry Tools > Multiparts to Single
> Parts" -- then they can be summed. You will need to relate you bits back to
> your buffer layers however, to match which bit goes in which buffer.
>
> Alternatively, and easier in my mind, you could "Union" your layers. This
> creates an exploded layer where each bit has attributes of both parent
> layers. You can then delete those elements that do not have a buffer value.
> Two steps but less messy.
>
>
> On 17/07/12 03:22, Manuel Spínola wrote:
>
>> Dear list members,
>>
>> I have a landuse layer and another layer with 20 circular polygons
>> (buffers) and I want to obtain the amount of each landuse category
>> within each circular polygon.  I tried "clip" from Geoprocessing Tools
>> but I dont get the information individualized for each circular polygon.
>>   Is it possible to get the landuse within each circular polygon in one
>> step?
>>
>> Best,
>>
>> Manuel
>>
>> --
>> *Manuel Spínola, Ph.D.*
>>
>> Instituto Internacional en Conservación y Manejo de Vida Silvestre
>> Universidad Nacional
>> Apartado 1350-3000
>> Heredia
>> COSTA RICA
>> mspinola at una.ac.cr <mailto:mspinola at una.ac.cr>
>> mspinola10 at gmail.com <mailto:mspinola10 at gmail.com>
>>
>> Teléfono: (506) 2277-3598
>> Fax: (506) 2237-7036
>> Personal website: Lobito de río
>> <https://sites.google.com/**site/lobitoderio/<https://sites.google.com/site/lobitoderio/>
>> >
>> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/**>
>>
>>
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>>
>
> --
> Cheers Simon
>
>    Simon Cropper - Open Content Creator
>
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-- 
*Manuel Spínola, Ph.D.*
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspinola at una.ac.cr
mspinola10 at gmail.com
Teléfono: (506) 2277-3598
Fax: (506) 2237-7036
Personal website: Lobito de río <https://sites.google.com/site/lobitoderio/>
Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/>
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