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Error in VDDT model for biophysical setting 1165 in mapping zones 18 and 21: The "time since disturbance" function was not utilized correctly during the model development process.

Background:

As a result of final quality control procedures for LANDFIRE National, it was noticed that the "time since disturbance" function in the VDDT model for BpS 1165 in zones 18 and 21 was not attributed correctly. Because two probabilistic transitions (alternate succession in classes A and C) in the model are contingent on time since disturbance, the "use time since disturbance" function should have been set on the RUN SETTINGS - OPTIONS tab in VDDT for the model to run correctly. When "use time since disturbance" is not selected, the percent of the landscape in classes A-D are 1, 84, 3 and 12, respectively, as shown in the description document. When "use time since disturbance" is selected the percent of the landscape in classes A-D changes to 10, 2, 5 and 83, respectively. Based on the assumption that the modelers achieved the results they wanted without the "use time since disturbance" function selected, it was decided to leave this function off. However, it should be noted that the model will produce very different results when the function is turned on. For future use, this model should be reassessed.

Advice:

Users intending to use this model locally may need to re-parameterize the model.

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