Change to LF Remap fuels for disturbed areas represents effective year 2019.
Reason for alert: Users of existing LANDFIRE (LF) fuel products need to be aware of a change in the products being released as part of Remap.
LF version(s): LF Remap (LF 2.0.0)
Updated product(s) or information: Areas mapped as disturbed by LF have been adjusted to account for vegetation conditions relative to Time Since Disturbance (TSD) for the 2019 effective year (accounting for disturbances between 2009 - 2016). This adjustment has been made to the following LF Remap products:
13 Anderson Fire Behavior Fuel Models (FBFM13)
40 Scott and Burgan Fire Behavior Fuel Models (FBFM40)
Forest Canopy Cover (CC)
Forest Canopy Height (CH)
Forest Canopy Bulk Density (CBD)
Forest Canopy Base Height (CBH)
Fuel Vegetation Type (FVT)
Fuel Vegetation Cover (FVC)
Fuel Vegetation Height (FVH)
Fuel Disturbance (FDist)
Historical Disturbance (HDist)
Problem or issue description: The significant refinement for the LF Remap products mentioned above, is that they represent "capable" fuels, meaning the TSD assignments have been calculated using an effective year. For example, LF Remap fuels are now assigned for the 2019 effective year. The new process considers all incorporated disturbances in LF Remap and provides an adjustment factor to account for the TSD, making the data "capable" of representing an effective year. These capable data account for increase or decrease in fuel attributes in disturbed areas to the effective year (2019 in this case).
Given that LF Remap is circa 2016 data, it is important to note that no new disturbances are added for 2017 through 2018. Although these new disturbance data are not available yet, they are being cataloged for future use in an Update. Disturbances older than 10 years in 2019 follow the existing LF protocol for removal from Fuel Disturbance and are represented by more recent non-disturbed LF Remap vegetation. For areas that have not been disturbed, fuel is based on LF Remap vegetation, which is the newest fuel vegetation available.
The objective for this change was to improve, clarify, and simplify fuel transitions and Fuel attribute change following disturbances. By synchronizing TSDs, users may not need to do much, if any adjustments, to the vegetation and fuel conditions to represent contemporary conditions. In addition, these refinements will improve performance of fire behavior modeling when using the data operationally. Starting with the Southwest GeoArea release (which includes Northwest GeoArea fuel products), LF Remap fuels will be delivered as capable fuels for the 2019 effective year.
The LF team stands ready to assist with questions and concerns regarding LF products. Contact us at the LF helpdesk.