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 (2013 Edition). Also used was the soil-association Map 01.01 (2013 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 (Edition 2012) were used for the presentation of imperviousness classes.