Vegetation Condition Class (VCC) represents a simple categorization of the associated Vegetation Departure (VDEP) layer and indicates the general level to which current vegetation is different from the simulated historical vegetation reference conditions. VDEP and VCC are based upon methods originally described in Interagency Fire Regime Condition Class Guidebook, but are not identical to those methods. Full descriptions of the methods used can be found in the VDEP product description. Users should review those methods before comparing VDEP or VCC values across LANDFIRE (LF) versions.
VCC is a derivative of the VDEP layer. It is important to read and understand the characteristics of the VDEP spatial product, particularly if VCC values are compared across versions as the VDEP methods varied which directly impacts across-version VDEP and VCC comparability.
In LF 2012, the original three VCC classes were divided in half to create six VCC classes to provide additional precision. The table describes the classes:
|LF 2012||LF c2001 National, LF 2001, LF 2008|
|VCC Ia: Very Low, VDEP 0 - 16||VCC I: Low departure, VDEP 0 - 33|
|VCC Ib: Low, VDEP 17 - 33|
|VCC IIa: Moderate to Low, VDEP 34 - 50||VCC II: Moderate departure, VDEP 34 - 66|
|VCC IIb: Moderate to High, VDEP 51 - 66|
|VCC IIIa: High, VDEP 67 - 83||VCC III: High departure, VDEP 67 - 100|
|VCC IIIb: Very High, VDEP 84 - 100|
The six new VCC classes can be collapsed into the original three VCC classes as shown above. Both the original three and new six class VCC classifications are included as attributes in the LF 2012 VCC layer.