{ "snippet": "The Grassland Encroachment indicator for TCA identifies areas in grasslands where conifer tree density has exceeded the levels presumed to be present in pre-Euro-American settlement non-forest vegetation. By our definition, non-forest areas cannot exceed 25%. This multidimensional dataset contains a single variable (encroachment) for assessment years 2020, 2022, and 2023.", "summary": "The Grassland Encroachment indicator for TCA identifies areas in grasslands where conifer tree density has exceeded the levels presumed to be present in pre-Euro-American settlement non-forest vegetation. By our definition, non-forest areas cannot exceed 25%. This multidimensional dataset contains a single variable (encroachment) for assessment years 2020, 2022, and 2023.", "accessInformation": "Reeves MC, Mitchell JE (2011) Extent of coterminous US rangelands: quantifying implications of differing agency perspectives. Rangel Ecol Manage 64:1\u201312 (https://research.fs.usda.gov/treesearch/41872); https://www.mlrc.gov/data; USDA; USFS; GO", "thumbnail": "thumbnail/thumbnail.png", "maxScale": 5000, "typeKeywords": [ "ArcGIS Server", "Data", "Image Service", "Service" ], "description": "

Direct Download (Raster Data Gateway)<\/span><\/span><\/a><\/p>

Objective:<\/span><\/span> <\/span><\/span>An indicator that identifies where tree density has exceeded the levels presumed to be present in pre-Euro-American settlement non-forest vegetation. By our definition, non-forest areas cannot exceed 25% tree canopy cover. Fire exclusion, climate, and human activities affect the progression of trees into non-forested ecosystems. Encroached areas may require restoration to meet ecological objectives. Restoration practices will be ecosystem specific.<\/span><\/span><\/p>

Data:<\/span><\/span> <\/span><\/span>The indicator uses areas identified as grasslands using LANDFIRE\u2019s Biophysical Settings (BpS) raster dataset (US_140BPS_20180618) along with a cross-walk based on Reeves MC, Mitchell JE (2011) (https://research.fs.usda.gov/treesearch/41872) to identify BpS units that were likely to be grasslands during pre-European times. Presence of conifer tree species was developed using USGS National Landcover Database (NLCD) legend class \u201c42 \u2013 Evergreen Forest\u201d. The Evergreen Forest class represents \u201careas dominated by trees generally greater than 5 meters tall, and greater than 20% of total vegetation cover. More than 75% of the tree species maintain their leaves all year. Canopy is never without green foliage.\u201d Grassland conifer encroachment is identified where raster pixels are identified as both \u201cgrasslands\u201d and NLCD \u201cEvergreen Forest\u201d. In years when NLCD is not updated, data is reused from the previous year, which is why there is only data for 3 of the 5 assessment years from 2020-2024. NLCD versions used: NLCD 2011 (TCA Assessment 2020), NLCD 2019 (TCA Assessment 2022), NLCD 2021 (TCA Assessment 2023). Encroachment for the 2023 TCA Assessment is 1-bit and therefore only contains values of 1 indicating where encroachment was observed, rather than the binary data from other years.<\/span><\/span><\/p>

Format:<\/span><\/span> Raster data are binary: (1) likely encroached or (0) not encroached<\/span><\/span><\/p>

Resolution:<\/span><\/span> 250m<\/span><\/span><\/p>

Source: <\/span><\/span>Custom grassland-BpS crosswalk<\/span><\/span><\/a>, <\/span><\/span>NLCD conifer presence<\/span><\/span><\/a><\/p>

Additional Resources:<\/span><\/span><\/p>

Details on <\/span><\/span>Method Changes and Source Data Versions<\/span><\/span><\/a><\/p>

Overview of the Terrestrial Condition Assessment: <\/span><\/span>TCA Hubsite<\/span><\/span><\/a> or <\/span><\/span>Landfire Office Hour Presentation<\/span><\/span><\/a><\/p>

Explore the results of the most recent assessment: <\/span><\/span>TCA Interactive Data Viewer<\/span><\/span><\/a><\/p>

Learn more about the TCA KPI: <\/span><\/span>TCA Dashboard<\/span><\/span><\/a><\/p>

*if you have trouble viewing the Dashboard, please submit a<\/span><\/span> <\/span><\/span>Tableau Viewer Access Request<\/span><\/span><\/a><\/p><\/div><\/div><\/div>", "licenseInfo": "

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Additionally, the U.S. Forest Service waives copyright and related rights in the work worldwide through the CC0 (which can be found at https://creativecommons.org/public-domain/cc0/).<\/span><\/p>

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