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I'm using 2.8.1 QGIS version (Wien) and I have a raster layer with FWI values and a vector with district polygons.

What I want is to calculate the mean pixel FWI value per district.

I know the Zonal Statistics funtion, but when I use her appears this error: 

"Algorithm Zonal Statistics starting...
'NoneType' object has no attribute 'exportToWkt' See log for more details".

I don´t know what could be the problem. I'm using the same CRS layers.

Any help?

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This can be due to several reasons. Have you checked the raw raster data including the NoData value using python? If not I can share a script with you to read the raster data but I am not sure whether you are comfortable with Python

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  • alternatively you can share the two datasets if they're not too big
    – RutgerH
    Commented Sep 23, 2015 at 8:23

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