Adjust number of trees in regeneration

This action is used to recalculate number of trees from regeneration layer while system of several variable size circles is used.


Method based on several regeneration circles with total area equal to the circle assigned in Layer Connection/Regeneration to e.g. R=2m. Master layer of regeneration has attribute with % of area share represented by respective circle. Tree number of every regeneration circle is recalculated using weight of the circle:

N = N/ (1/Ncircles)*AreaShare/100*K


K is a coefficient which considers area of regeneration circles:

K = Sreg/SUM(Scircle)

where

Sreg is area of regeneration circle (see Layer connection/Regeneration)

Scircle is area of single regeneration circle used during fieldwork.


Standard procedure is based on the fixed number of regeneration circles (usually 3). In such a case

Sreg=Scircle*3 and K=1.


In case of variable number of regeneration circles Sreg may by chosen equal to one regeneration circle or to max. number of regeneration circles or to average number of regeneration circles. If e.g. max number is 3 then Sreg is recommended to be equal to Scircle*2.


Old value of tree number is stored to a new attribute “Orig_TreeNumber”.


During calculation the AreaShare values are checked: Sum(AreaShare) for plot/subplot has to be 100.


It is expected that <Regen. master layer> is related to Plot or Subplot layer. If Subplot layer is present in the project then Regen. layer is automatically related to Subplots.