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Thank you for answer. It was very helpful and could make a further step. In the zonal statistics i can calculate different values. I got the following results out of plots: But now i don`t realy know how to understand this data. What is the going to be counted? Are these the pixels or the pixel values. I want to know the number of green pixels per plot ...


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I suggest you to use the tool Zonal Statistics, you'll be able to produce different statistics of pixels by polygon and calculate your percentage based on that.


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The ArcGIS Combine tool is for rasters and not vector data. So, to use that you would have to first rasterize your data. However, that is what I would recomend for change detection anyway. The following assumes you rasterize your data: In QGIS, you have a number of options: From the Processing Toolbox use Orfeo's MultivariateAlterationDetector (just ...


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