Thank you very much Simon.<div><br></div><div>That works, specially the second option.</div><div><br></div><div>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.</div>
<div><br></div><div>Best,</div><div><br></div><div>Manuel<br><br><div class="gmail_quote">2012/7/16 Simon Cropper <span dir="ltr"><<a href="mailto:simoncropper@fossworkflowguides.com" target="_blank">simoncropper@fossworkflowguides.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Manuel,<br>
<br>
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.<br>
<br>
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.<div class="im">
<br>
<br>
On 17/07/12 03:22, Manuel Spínola wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Dear list members,<br>
<br>
I have a landuse layer and another layer with 20 circular polygons<br>
(buffers) and I want to obtain the amount of each landuse category<br>
within each circular polygon. I tried "clip" from Geoprocessing Tools<br>
but I dont get the information individualized for each circular polygon.<br>
Is it possible to get the landuse within each circular polygon in one<br>
step?<br>
<br>
Best,<br>
<br>
Manuel<br>
<br>
--<br></div>
*Manuel Spínola, Ph.D.*<div class="im"><br>
Instituto Internacional en Conservación y Manejo de Vida Silvestre<br>
Universidad Nacional<br>
Apartado 1350-3000<br>
Heredia<br>
COSTA RICA<br>
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<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><b>Manuel Spínola, Ph.D.</b>
<br>
Instituto Internacional en Conservación y Manejo de Vida Silvestre
<br>
Universidad Nacional
<br>
Apartado 1350-3000
<br>
Heredia
<br>
COSTA RICA
<br>
<a href="mailto:mspinola@una.ac.cr" target="_blank">mspinola@una.ac.cr</a>
<br>
<a href="mailto:mspinola10@gmail.com" target="_blank">mspinola10@gmail.com</a>
<br>
Teléfono: (506) 2277-3598
<br>
Fax: (506) 2237-7036
<br>
Personal website: <a href="https://sites.google.com/site/lobitoderio/" target="_blank">Lobito de río</a>
<br>
Institutional website: <a href="http://www.icomvis.una.ac.cr/" target="_blank">ICOMVIS</a><br>
</div>