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LANDFIRE 2001 Refresh Percent of Mixed Severity Fires (PMS) HI

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: May 05, 2026 at 09:46 PM | Dataset Last Updated: September 29, 2025 at 12:00 AM
The LANDFIRE (LF) 2001 historical Percent of Mixed Severity Fires (PMS) product quantifies the percent of all fires that were of low severity. Mixed severity fires cause between 25 and 75% average replacement of dominant overstory aboveground biomass within a typical fire perimeter. This product is derived from the vegetation and disturbance dynamics model Vegetation Dynamics Development Tool (VDDT) and is intended to describe one component of fire regime characteristics in the context of the broader historical time period represented by the LF Biophysical Settings (BPS) product and Biophysical Settings Model documentation. This layer is created by linking the BPS Group attribute with the LF 2001 Refresh Model Tracker (RMT) data and assigning the historical PMS attribute. PMS was classified into 20 categories using 5% increments. Additional data layer values were included to represent Water (111), Snow / Ice (112), Barren (131), and Sparsely Vegetated (132). Vegetated areas that never burned during the simulations were included in the category "Indeterminate Fire Regime Characteristics" (133); these vegetation types either had no defined fire behavior or had extremely low probabilities of fire ignition.

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