AN ALGEBRAIC GRAPHICAL TOOL TO COMPARE ECOSYSTEMS WITH RESPECT TO THEIR POLLUTION .2. COMPARATIVE REGIONAL-ANALYSIS

Often comparisons are to be performed which have their basis on vector ial quantities. As an example, regions in the south-western part of Ge rmany (Baden-Wurttemberg) are evaluated under different criteria, refl ecting air quality, water quality, damage on vegetation near the soil and contamination of leaves. It is hard to identify one region as most polluted if more than one criterion is to be regarded at the same tim e. A tool to perform this is the ranking by Hasse diagrams, which is d emonstrated with the example of 13 regions (mainly westwards of cities ). It turns out that five regions should be examined more closely. Two of them are the regions westwards of Mannheim and Mannheim itself.