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From the dataset abstract

This dataset represents the percent of non-agriculatural, non-native vegetation based on LANDFIRE existing vegetation type (EVT) for a 30-m grid cell within individual local NHDPlusV2...

Source: The StreamCat Dataset: Accumulated Attributes for NHDPlusV2 Catchments Riparian Buffer (Version 2.1) for the Conterminous United States: Non-agricultural Introduced Managed Vegetation