Patch Sub-Account Types

Once your model is loaded you will notice in the 'Targets' panel that Patchworks has created six sub-accounts for each of the patch size accounts you have defined. The following section describes each sub-account.

Table 2. Patch Sub-Account Types

Sub-Account TypeDescription
area The 'area' sub account sums the total area within the patch size class (in hectares).
blocks The 'blocks' sub account provides the average number of blocks that are associated with each patch in this size class.
size The 'size' sub account represent a percent of the total patch criteria that is within the size class. The maximum value of this account is 100%.
shape

The 'shape' sub account represents an average edge to area ratio for the size class category. This is the perimeter of the patch area divided by the perimeter of a circle with the same size. The value in this account ranges from 1 and up (1 being a perfect circle shape, and greater values being more dendritic with more perimieter).

frequency The 'frequency' sub-account represents the number of patches in the size class.
freqpercent The 'freqpercent' sub-account represents the number of patches in the size class as a percent of the total number of patches in all size classes.
attractor

The 'attractor' sub-account can be used to encourage the scheduler to allocate patches of the given size class. The account works to draw the average patch size of all patches (in all size classes) towards the range of the select category. Implementation of this feature provides a 'gravitational attraction' for the formation of large patch sizes.

It is important to activate only one attractor in the analysis so that they do not conflict with each other. An attractor sub-account is simply active or inactive and requires no values to be set. The values within the attractor sub-account target chart mimic those of the size sub-account.