Fractional Estimates of Multiple Exotic Annual Grass (EAG) Species in the Sagebrush Biome, USA, 2016-2024 (ver. 5.0, July 2025)

This dataset provides annual (2016 - 2024) estimates of fractional cover for Exotic Annual Grass (EAG) species and a native perennial bunch grass for rangelands of the western United States. The dataset includes four (five for 2023 and 2024) fractional cover maps per year, accompanied by corresponding confidence maps, for a group of 15 EAG species. The following 15 species are included in the overall EAG cover estimate (species followed by * indicate specific maps for that species); field brome* (Bromus arvensis), medusahead* (Taeniatherum caput-medusae), cheatgrass* (Bromus tectorum), rattlesnake brome (Bromus briziformis), rescuegrass (Bromus catharticus), Bald brome (Bromus commutatus and Bromus racemosus), ripgut brome (Bromus diandrus), soft brome (Bromus hordeaceus and Bromus hordeaceus spp. hordeaceus), Japanese brome (Bromus japonicus), compact brome (Bromus madritensis and Bromus madritensis ssp. Rubens), red brome (Bromus rubens), rye brome (Bromus secalinus). Sandberg blue grass (Poa secunda) is not considered an EAG by this project or included in the EAG layer. We map Poa secunda separately as it can have similar phenology to many invasive grasses such as cheatgrass.

Revision History
First release:  December 20, 2021
Revision ver. 2.0:  December 20, 2022
Revision ver. 3.0:  July 07, 2023
Revision ver. 4.0, July 26, 2024
Revision: July 18, 2025 (ver. 5.0).