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The Existing Vegetation Type (EVT) layer represents the species composition currently present at a given site. Vegetation map units are primarily derived from NatureServe's Ecological Systems classification, which is a nationally consistent set of mid-scale ecological units. Additional units are derived from NLCD, National Vegetation Classification Standard (NVCS) Alliances, and LANDFIRE specific types.
EVTs are mapped using decision tree models, field data, Landsat imagery, elevation, and biophysical gradient data. Decision tree models are developed separately for each of the three lifeforms -tree, shrub, and herbaceous and are then used to generate lifeform specific EVT layers.
LANDFIRE uses EVT in several subsequent layers, including the development of the fuel layers.
New and Improved LF Auto-Keys: LF is gearing up for LF remap - learn about the redesign of the Auto-Keys process, which is used to determine existing vegetation type classification based on plot data in the LFRDB — Developing Auto-Keys for LANDFIRE Vegetation Mapping: 2014-2015 CONUS Project Report