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The Existing Vegetation Height (EVH) layer represents the average height of the dominant vegetation for a 30-m grid cell.
Canopy height is generated separately for tree, shrub and herbaceous lifeforms using training data and other layers. EVH is determined by the average height weighted by species cover and based on the existing vegetation type (EVT) lifeform. Decision tree models using field reference data and Landsat, elevation, and ancillary data are developed separately for each lifeform. Decision tree relationships are used to generate lifeform specific height class layers, which are merged into a single composite EVH layer.
LANDFIRE (LF) uses EVH in several subsequent layers, including the development of the fuel layers.