The Map is based on the assessment of the soil functions as shown in the Environmental Atlas Maps 01.12.1 through 01.12.5 (2006 Edition). Also used was the soil-association Map 01.01 (2005 Edition), from which the danger of toxic wastes, i.e. from rubble-soil associations, sewage farms and railway track beds, was taken.
The data of the Environmental Atlas Map 01.02 (2004 Edition) were used for the consideration of imperviousness classes.