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I have a raster file on precipitation and I want to create zonal statistics as a table using a shape file wiht boundaries of countries across the world. However it appears that I need to take into account that in different latituted the corresponding area is different and thus I need to weight my statistic (mean etc) for area. Any suggestions on how I can do that?

Thanks!

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If you are open for other GIS tools then have a look at SAGA-GIS:

http://sourceforge.net/projects/saga-gis/

There is a module called "Grid Statistics for Polygons" which does exactly what you are looking for.

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