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Classifying land use in specific polygons

AliceFraser-McDonald

I am trying to use the shapefile here: Historic Landfill Sites - data.gov.uk to work out how much of the sites are covered in trees. I have managed to load the shapefile and aerial images (World Imagery basemap) and clip the map to just show the imagery within the polygons. Now I would like to classify how much of each polygon is covered with trees however the classification tool is greyed out (I think because it is not a raster file). Is there any way around this? I am using Arcmap 10.1.

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