the key parameter of WILDisland; describes wilderness and naturalness (A = wild and natural islands; B = natural, slight human alteration; C = stronger impact by forestry, river regulation, infrastructure etc.)

gives the category of hydromorphology (in 10 river km segments); based on official findings of the ICPDR Joint Danube Survey 3 (1 = nearly natural, 2 = slightly modified, 3 = moderately modified, 4 = severely modified, 5 = totally modified)

describes the process which “formed” the respective island (A = natural process in active river channel; B = island as result of regulation (mean water correction) or strongly influenced by hydrological alterations; C = islands developed on groynes, guiding walls, other artificial structures)