Landfire Vegetation Departure (Hawaii) (Image Service)

Metadata Updated: December 3, 2020

Broad-scale alterations of historical fire regimes and vegetation dynamics have occurred in many landscapes in the U.S. through the combined influence of land management practices, fire exclusion, ungulate herbivory, insect and disease outbreaks, climate change, and invasion of non-native plant species. The LANDFIRE Program produces maps of historical fire regimes and vegetation conditions using the disturbance dynamics model VDDT. The LANDFIRE Program also produces maps of current vegetation and measurements of current vegetation departure from simulated historical reference conditions. These maps support fire and landscape management planning outlined in the goals of the National Fire Plan, Federal Wildland Fire Management Policy, and the Healthy Forests Restoration Act. Data Summary: The Vegetation Departure (VDEP) data layer categorizes departure between current vegetation conditions and reference vegetation conditions according to the methods outlined in the Interagency Fire Regime Condition Class Guidebook.k (Hann and others 2004). Technical Methods: Summary units for the departure computation were defined as a BioPhysical Setting (BpS) with identical reference condition values regardless of map zone. This is a change from previous versions of LANDFIRE. For example, speculate that a particular BpS is present in map zone 1, 2, 4, 5, 6 and 8. The reference conditions for this BpS are identical in map zones 1, 2, 4, 5 and 8 so those map zones become a summary unit for the departure computation (VDEP) in LF2014. Since reference conditions are unique for this BpS in map zone 6, it is a separate summary unit for calculating departure (VDEP) in LF2014. Within each biophysical setting in each summary unit, we compare the reference percentage of each succession class (SClass) to the current percentage, and the smaller of the two is summed to determine the similarity index for the BpS. This value is then subtracted from 100 to determine the departure value. Departure value is between 0 and 100, with 100 representing maximum departure. The LANDFIRE VDEP approach differs from that outlined in the Interagency Fire Regime Condition Class Guidebook.k (Hann and others 2004) as follows: LANDFIRE VDEP is based on departure of current vegetation conditions from reference vegetation conditions only, whereas the Guidebook.k approach includes departure of current fire regimes from those of the reference period. The reference conditions are derived from quantitative vegetation and disturbance dynamics models developed in VDDT/ST-Sim. The current conditions are derived from the corresponding version of the LANDFIRE Succession Class data layer; please refer to the product description page at for more information. The proportion of the landscape occupied by each SClass in each BpS unit in each summary unit is used to represent the current condition of that SClass in the VDEP calculation. The areas currently mapped to agriculture, urban, water, barren, or sparsely vegetated BpS units are not included in the VDEP calculation; thus, VDEP is based entirely on the remaining area of each BpS unit that is occupied by valid SClasses. Additional data layer values were included to represent Water (111), Snow / Ice (112), Urban (120), Barren (131), Sparsely Vegetated BpS (132), and Agriculture (180). Metadata and Downloads

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Public: This dataset is intended for public access and use. License: See this page for license information.

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Metadata Created Date December 3, 2020
Metadata Updated Date December 3, 2020

Metadata Source

Harvested from USDA JSON

Additional Metadata

Resource Type Dataset
Metadata Created Date December 3, 2020
Metadata Updated Date December 3, 2020
Publisher U.S. Forest Service
Unique Identifier Unknown
Data First Published 2019-08-09
Data Last Modified 2020-06-10
Category geospatial
Public Access Level public
Bureau Code 005:96
Metadata Context
Schema Version
Catalog Describedby
Homepage URL
Metadata Type geospatial
Program Code 005:059
Source Datajson Identifier True
Source Hash 316929e2f7b01ed890388cc4458ce1f4dc2e433d
Source Schema Version 1.1
Spatial 175.5077,49.0571,-117.2913,67.6013

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