planning area
finished card
object of the exercise is to define with the help of Polygon tool different uses in the air picture and finally the surfaces of the individual to calculate profits.
working order and without duplication of coverage can be had at: settings - "avoid duplication of new polygons> activate the layer uses -> Project Settings . Furthermore, one should under fishing options a relatively too high a value for the tolerance set to optimally detect the junctions of the polygons.
have to process the planning area I Layer uses planning area and negatively aktiviert.Somit I could draw the polygons exactly to the limits of the planning area.
After the registration of all uses under vector - resolved> Resolve to use classes -> Geoverarbeitungswerkzeuge. The new layer was use added balance and using the field calculator one could now calculate the area of each use:
result of the area calculation
my opinion exist on the specified area no agricultural land, so they appear at the end also not in the calculation.
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