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Vegetation Departure (VDEP) indicates how different current vegetation on a landscape is from estimated historical conditions. VDEP is based on changes to species composition, structural stage, and canopy closure using methods originally described in the Interagency Fire Regime Condition Class Guidebook, but is not identical to those methods. LANDFIRE VDEP is based only on departure of current vegetation conditions from reference vegetation conditions, whereas the Guidebook approach includes departure of current fire regimes from those of the reference period.
VDEP is a landscape metric and is scale dependent. Every pixel in a unique biophysical settings (BpS) in a summary unit has the same VDEP value. These large landscape values may not represent smaller areas within a summary unit.
The VDEP metric ranges from 0 - 100, and is based on four factors. These inputs are held constant within a single version of LANDFIRE, but can be different across LANDFIRE versions, which directly impacts VDEP comparability across versions. VDEP can be compared across versions but caution is advised.
|LANDFIRE Version||LANDFIRE Mapped Current Conditions||Estimated Reference Conditions||Included Types||Landscape Summary Unit|
|LF National (1.0.0)||LF National Succession Class||LANDSUM output, parameterized by BpS models||Natural Vegetation Only||Map Zones and
|LF 2001 (1.0.5)||LF2001 Succession Class||BpS Group Models||Natural Vegetation, plus Burnable Ag and Burnable Urban||HUC12 within Map Zones|
|LF 2008 (1.1.0)||LF2008 Succession Class||Bps Group Models||Natural Vegetation, plus Burnable Ag and Burnable Urban||HUC12 within Map Zones|
|LF 2012 (1.3.0)||LF2012 Succession Class||BpS Models||Natural Vegetation Only||Unique BpS Model Reference Conditions|
Refer to Succession Class (SCLASS), VDEP and VCC metadata in each LANDFIRE version for more information.