LANDFIRE's (LF) Existing Vegetation Type (EVT) represents the current distribution of the terrestrial ecological systems classification, developed by NatureServe for the western hemisphere, through 2016. A terrestrial ecological system is defined as a group of plant community types (associations) that tend to co-occur within landscapes with similar ecological processes, substrates, and/or environmental gradients.
EVT also includes ruderal or semi-natural vegetation types within the U.S. National Vegetation Classification. The LF Ruderal NVC Groups Descriptions for CONUS provides descriptions for each ruderal NVC Group including species, distribution, and classification information.
EVT is mapped using decision tree models, field data, Landsat imagery, elevation, and biophysical gradient data.
LF Remap Auto-Keys: 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 LF Vegetation Mapping: 2014-2015 CONUS Project Report
LF uses an assessment process that compares the EVT product for a pixel with the Auto-Key EVT assignment for a sample plot contained in that pixel. Agreement assessments have has been developed for each LF Remap CONUS GeoArea.
The comma separated value (CSV) file used for the raster attribute table is included in the LF product download in database file (DBF) format.
(Why is the CSV important?)