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Zonal Statistic As Table--Problem calculating MEAN-Values

Question asked by geonetadmin on Mar 5, 2012
Latest reply on Mar 8, 2012 by patflo
Original User: patflo

Hello i`ve got a problem doing the zonal statistic calculation with a layer and a shape-file. My layer is a temperature layer for europe and my shapefile is a polygon shapefile from Germany. When i want to do the MEAN calculation for every polygon in the shapefile it gives me MEAN-Values for the temperature of -1100 degrees. I think the problem is that some of the polygons are not fully covered by the raster layer? Has someone an idea how to get the correct values?

in the attachement i put a pic of the shapefile with the raster layer and the table.

Thanks in advance for your help