First, the attributes to be copied are defined.

For a 3D project, you can choose between 3 mean value calculations:

• During horizontal averaging from an element layer to a node layer, the values of the elements of the selected element layer that are horizontally adjacent to the node are averaged to form a node value, which is then stored in the selected node layer (e.g. UNTE layer 1 is averaged to ZKOR layer 5).

• During horizontal averaging from a node layer to an element layer, the (3 or 4) corner node values of the selected node layer are averaged to an element value, which is then stored in the selected element layer (e.g. ZKOR layer 7 is averaged to UNTE layer 1.

• For the 3D mean values for a node layer, the values of the elements adjacent to the node from the two element layers adjacent to the node layer are averaged. For a selected node layer k, these are the values of the elements neighbouring the node in the element layers k-1 and k (e.g. KSPE in layer 7 as the mean value from SPEI).

• For the 3D mean values for an element layer, the values of the corner nodes of the 3D element (3 or 4 nodes at the top and bottom) are averaged. For a selected element layer k, these are the 3 or 4 values of the element corner nodes in the node layer k and k+1 (e.g. SPEI in layer 1 as the mean value from KSPE)..

• For the 3D mean value for all nodal layers, the element values are averaged for all layers in the same way as for the 3D mean value for just one nodal layer (e.g. CSPE in all nodal layers as the mean value from SPEI)

• For the 3D mean value for all element layers, the node values are averaged for all layers in the same way as for the 3D mean value for just one element layer (e.g. SPEI in all element layers as the mean value from KSPE).

You can choose between a normal and a logarithmic mean value determination:

Normal (arithmetic) mean value μ:

where w_i are the neighbouring node or element values that have been converted and n is the number of neighbouring nodes/element values.

Logarithmic mean value μ:

where w_i are the neighbouring node or element values, to be converted and n is the number of neighbouring nodes/element values. This method is particularly suitable for positive element values with different orders of magnitude, e.g. hydraulic conductivity values.

When converting element values to node values, either an equal weighting or a weighting with the element areas F_i can be carried out. With equal weighting, the calculated average value remains unchanged. Weighting using the element area is carried out using the calculation rule:

Normal:

or

Logarithmic:

Where F_i is the area of the neiboughring elements.

When converting node values to element values, only a normal (even) weighting is possible:

,

where wi is the neighbouring node values that are to be converted and n is the number of neighbouring nodes/element values.

Consider mass conservation:

If mass conservation is to be taken into account (e.g. when converting from FLAE to KNOT), the element values (e.g. inflow rates) are distributed proportionally to the corner nodes of the element. The area weighting and the choice of averaging (logarithmic/normal) has no significance in this case. A node receives a quarter of the element set from a neighbouring quadrilateral, a third of the element set from a neighbouring triangle and so on