[Qgis-user] getting statistics from a raster layer

[Carlos Carbajal]

Hi Antonio,

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.
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

Regards,

/P.D. Sorry for my English, I'm using the google translator./


El 14/09/2012 16:22, Antonio Silva escribió:
> Hi fellows
>
> 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.
>
> 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.
>
> Well, I'd like to calculate some basic statistics (mean, median, 
> maximum, minimum, sd) from a raster layer.
>
> At http://poet.jpl.nasa.gov/ 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.
>
> I learned to do this procedure in gvSIG (in Spanish, sorry):
> SEXTANTE > HERRAMIENTAS BÁSICAS PARA CAPAS RASTER > CORTAR CAPA RASTER 
> COM CAPA DE POLÍGONOS
> SEXTANTE > HERRAMIENTAS BÁSICAS PARA CAPAS RASTER > ESTADÍSDICAS BÁSICAS
>
> However I did not find a way to do these calculations in QGIS.
>
> Thanks in advance for any guidance.
>
> All the best,
>
> Antonio Olinto
>
>
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-- 
Ing. Carlos Carbajal Llosa
Consultor Recursos Hídricos y SIG

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