Hi, I have a shape file for US counties in 1900 and a tiff file for agriculture suitability in the world. I want to calculate average suitability for a county.
When I upload both of them to the same project I don't have the zonal statistics option. QGIS does not recognize the the us counties shapefile is polygons, I cannot do things like vectors-->geometry tools --> polygons centroids. I tried different options in raster --> conversion and other things, nothing works. I also tried this with a modern shape file of counties, where QGIS recognized the polygons but still the zonal statistics option doesn't appear. I am using QGIS 2.18.13. Thanks, Ori
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