Total perimeter of complex polygon without boundary of investigation area

Discussion created by lodsen on Aug 16, 2011
Latest reply on Jan 22, 2014 by taylora90
Hello everybody,

I am trying to calculate the total perimeter of the GREEN polygon(s) in the screenshot in the attachment (i.e. I want the length of the "green front", including donut holes). Of course I could calculate the total perimeter in the attribute table but I do not want the segments that would be contributed by the boundary of the investigation area (in red) to be included in the total perimeter calculation. Do you have any suggestions?

Thank you,

Ludwig Hilger (Germany)