Ecostate 1989-1991

Threat-based ecostate maps (version 4) depict sagebrush rangeland condition and trend across the sagebrush biome of the Western United States. Based on the principles of Threat-Based Land Management (https://sageshare.org/), ecostates provide coarse bins of vegetation condition based on primary ecosystem-level threats from invasive annual grasses, conifer encroachment, and wildfire. This map displays a snapshot of rangeland condition in Nevada for 1989-1991. Ecostates are mapped as 30m pixels based on percent cover of annual forbs & grasses (AFG), perennial forbs & grasses (PFG), shrubs, and trees from the Rangeland Analysis Platform vegetation version 3 cover products (https://rangelands.app/). Agriculture, barren areas and urban areas are excluded. These maps were originally developed for sagebrush rangelands in Oregon and have since expanded to the sagebrush biome; use caution in applying this model in areas that are not current or historic sagebrush steppe. NOTE: the ecostate map rule set has changed between version 3 and version 4 - if you downloaded data prior to July of 2024 please re-download the most recent version. For more information, documentation, and links to the full time series see our storymap: https://storymaps.arcgis.com/stories/5b3558b88d6f494f94a5236ca8bc3345. Source: Institute for Natural Resources, 2024. Download data: https://oe.oregonexplorer.info/externalcontent/sagecon/spatialdatafordownload/Threat_Based_Ecostates_v4_2021_to_2023.zip
**Deprecated due to updated ruleset (12/5/2024)