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Early Estimates of Exotic Annual Grass (EAG) in the Sagebrush Biome, USA, 2024

Metadata Updated: July 20, 2024

These datasets provide early estimates of 2024 fractional cover for exotic annual grass (EAG) species and one native perennial grass species on a weekly basis from April to late June. Typically, the EAG estimates are publicly released within 7-13 days of the latest satellite observation used for that version. Each weekly release contains five fractional cover maps along with their corresponding confidence maps for: 1) a group of 16 species of EAGs, 2) cheatgrass (Bromus tectorum); 3) Field Brome (Bromus arvensis); 4) medusahead (Taeniatherum caput-medusae); and 5) Sandberg bluegrass (Poa secunda). These datasets were generated leveraging field observations from Bureau of Land Management (BLM) Assessment, Inventory, and Monitoring (AIM) data plots; Harmonized Landsat and Sentinel-2 (HLS) based Normalized Difference Vegetation Index (NDVI); other relevant environmental, vegetation, remotely sensed, and geophysical drivers; and artificial intelligence/machine learning techniques. A total of 38,242 AIM plots from years 2016–2023 were used to train an ensemble of five-fold regression-tree models using a cross-validation approach (each observation was used as test data once and as training data four times) that developed all the fractional cover maps. The geographic coverage includes arid and semi-arid rangelands in the western U.S classified as shrubs or grassland/herbaceous by the 2021 National Land Cover Database at or below 2350-m elevation. Note: Maps of April 19th, 2024, were developed using satellite observation data no later than April 12. Maps of April 29th, 2024, were developed using satellite observation data no later than April 19. Maps of May 3rd, 2024, were developed using satellite observation data no later than April 26. Maps of May 10th, 2024, were developed using satellite observation data no later than May 3.
Maps of May 17th, 2024, were developed using satellite observation data no later than May 10. Maps of May 24th, 2024, were developed using satellite observation data no later than May 18. Maps of May 31st, 2024, were developed using satellite observation data no later than May 24.
Maps of June 7th, 2024, were developed using satellite observation data no later than June 1. Maps of June 14th, 2024, were developed using satellite observation data no later than June 8. Maps of June 21st, 2024, were developed using satellite observation data no later than June 16.
Releases: First Release: April 19, 2024 (ver. 1.0) Revised: April 29, 2024 (ver. 2.0) Revised: May 03, 2024 (ver. 3.0) Revised: May 10, 2024 (ver. 4.0) Revised: May 17, 2024 (ver. 5.0) Revised: May 24, 2024 (ver. 6.0) Revised: May 31, 2024 (ver. 7.0) Revised: June 7, 2024 (ver. 8.0) Revised: June 14, 2024 (ver. 9.0) Revised: June 21, 2024 (ver. 10.0)

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Created Date May 5, 2024
Metadata Updated Date July 20, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date May 5, 2024
Metadata Updated Date July 20, 2024
Publisher U.S. Geological Survey
Maintainer
@Id http://datainventory.doi.gov/id/dataset/da1784643230fb8fd0584fce0bc4ca85
Identifier USGS:661fb823d34e7eb9eb7eac46
Data Last Modified 20240621
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://datainventory.doi.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id f69d0582-8230-4aae-b6f1-105ba5253bd8
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -124.94,31.17,-109.0,49.0
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 8334dd3fe5584a7fe4512697599bb32616ff2f9d80e9bb2fe3a4af9a6d4df43a
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -124.94, 31.17, -124.94, 49.0, -109.0, 49.0, -109.0, 31.17, -124.94, 31.17}

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