Compared to the simplified tree (Figure 9), the full tree (Figure S1) performs an additional separation of T7 based on geology, whereby only highly suitable geology (S=1) leads to a very high suitability (T7a), while areas with less suitable geology (S<1) are rated with high suitability (T7b). T6 is further split based on geology and agricultural unit, whereby only areas with a highly suitable geology (S=1; T6a) or areas with a less suitable geology (S<1) but listed as agricultural unit (S=1; T6b) achieve a high suitability, while area not listed as agricultural unit (S=0.75) are rated with medium suitability (T6c). Also, T12 experiences a further split into three terminal nodes based on agricultural unit and water temperature. Thereby, only areas listed as agricultural unit (S=1; T12a) or areas not listed as agricultural unit but with ideal water temperatures (S=1; T12b) achieve a high suitability while less suitable water temperatures (S<1) are rated with medium suitability (T12c). Furthermore, T11 is split in four terminal nodes, of which only one achieves a high suitability. This applies to cases with a highly suitable water temperature (S=1) and listed as agricultural unit (S=1; T11a). Areas not listed as agricultural unit (T11b) achieve a medium suitability. If the water temperature is not ideal (S≤0.75) and the site is located in a suitable fish region (S=1; T11b) a medium suitability is achieved, while an unsuitable fish region (S=0) causes the exclusion of related areas (T11c).

The figure shows the full decision tree of aquaZone, which includes eight out of 30 environmental criteria.