<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hi Antonio,<br>
<br>
I recommend that you enable Sextante pluging for Quantum, in the
latest version comes with tools SAGA, there are algorithms for
working with raster, but I still have not successfully tested.<br>
The other option is to use raster tools, such as Clipper, it gives
you an option to use a vector layer as a mask, after that you can
use zonal statistics, there is a plugin for it<br>
<br>
Regards,<br>
<br>
<small><i>P.D. Sorry for my English, I'm using the google
translator.</i></small><br>
<br>
<br>
<div class="moz-cite-prefix">El 14/09/2012 16:22, Antonio Silva
escribió:<br>
</div>
<blockquote
cite="mid:CAE8g1gOJTde5N+rOZW8sr3m0bmSijo-DJKg_oXsz_a5i5OSz1A@mail.gmail.com"
type="cite">Hi fellows<br>
<br>
This is my first post in this list. I've been using QGIS since the
end of last year. I run QGIS on a UBUNTU 12.04 64 bits system.<br>
<br>
My purpose is to visualize and analyze fishery and oceanography
information on a GIS platform. I'm biologist / oceanographer and I
work at Sao Paulo Fisheries Institute, Brazil.<br>
<br>
Well, I'd like to calculate some basic statistics (mean, median,
maximum, minimum, sd) from a raster layer.<br>
<br>
At <a moz-do-not-send="true" href="http://poet.jpl.nasa.gov/"
target="_blank">http://poet.jpl.nasa.gov/</a> I got the mean sea
surface temperature off southwestern Brazilian coast for some
months. I downloaded the data in ARC GRID ASCII format. They can
be visualized easily on QGIS as a raster layer. I also have a
shape with a polygon that delimitates my area of interest. I'd
like to calculate the mean, max, min, etc. temperatures for this
specific area.<br>
<br>
I learned to do this procedure in gvSIG (in Spanish, sorry):<br>
SEXTANTE > HERRAMIENTAS BÁSICAS PARA CAPAS RASTER > CORTAR
CAPA RASTER COM CAPA DE POLÍGONOS<br>
<font face="Arial, sans-serif">SEXTANTE > HERRAMIENTAS BÁSICAS
PARA CAPAS RASTER > ESTADÍSDICAS BÁSICAS</font><br>
<br>
<span id="result_box" class="" lang="en"><span class="hps">However</span>
<span class="hps alt-edited">I did not find</span> <span
class="hps">a way to do</span> <span class="hps">these
calculations</span> <span class="hps">in</span> <span
class="hps">QGIS</span><span class="">.<br>
</span></span><br>
<span id="result_box" class="short_text" lang="en"><span
class="hps alt-edited">Thanks in advance</span> <span
class="hps">for any guidance</span><span class="">.<br>
<br>
All the best,<br>
<br>
Antonio</span></span> Olinto<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Qgis-user mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="http://lists.osgeo.org/mailman/listinfo/qgis-user">http://lists.osgeo.org/mailman/listinfo/qgis-user</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Ing. Carlos Carbajal Llosa
Consultor Recursos Hídricos y SIG</pre>
</body>
</html>