Terrestrial Condition Assessment (TCA) Grassland Encroachment

<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="font-weight:bold;margin:0 0 11 0;"><A href="https://data.fs.usda.gov/geodata/rastergateway/TCA/TCA_Grassland_Encroachment.zip" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Direct Download (Raster Data Gateway)</SPAN></SPAN></A></P><P STYLE="margin:0 0 13 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Objective:</SPAN></SPAN><SPAN><SPAN> </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><P STYLE="margin:0 0 13 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Data:</SPAN></SPAN><SPAN><SPAN> </SPAN></SPAN><SPAN><SPAN>The indicator uses areas identified as grasslands using LANDFIRE’s 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 “42 – Evergreen Forest”. The Evergreen Forest class represents “areas 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.” Grassland conifer encroachment is identified where raster pixels are identified as both “grasslands” and NLCD “Evergreen Forest”. 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><P STYLE="margin:0 0 13 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Format:</SPAN></SPAN><SPAN><SPAN> Raster data are binary: (1) likely encroached or (0) not encroached</SPAN></SPAN></P><P STYLE="margin:0 0 13 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Resolution:</SPAN></SPAN><SPAN><SPAN> 250m</SPAN></SPAN></P><P STYLE="margin:0 0 13 0;"><SPAN STYLE="font-weight:bold;"><SPAN>Source: </SPAN></SPAN><A href="https://research.fs.usda.gov/treesearch/41872" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Custom grassland-BpS crosswalk</SPAN></SPAN></A><SPAN><SPAN>, </SPAN></SPAN><A href="https://www.mrlc.gov/data" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>NLCD conifer presence</SPAN></SPAN></A></P><P STYLE="font-weight:bold;margin:0 0 11 0;"><SPAN><SPAN>Additional Resources:</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Details on </SPAN></SPAN><A href="https://usfs.box.com/s/79vx1b42xg8u6ivjombxjes36nzfhgml" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Method Changes and Source Data Versions</SPAN></SPAN></A></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Overview of the Terrestrial Condition Assessment: </SPAN></SPAN><A href="https://terrestrial-condition-assessment-usfs.hub.arcgis.com/" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>TCA Hubsite</SPAN></SPAN></A><SPAN><SPAN> or </SPAN></SPAN><A href="https://www.youtube.com/watch?v=Kf0P3cAq1rs&amp;list=PLwRbAc4x5n94rLca1CXXuugtRDt_G666M&amp;index=19" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Landfire Office Hour Presentation</SPAN></SPAN></A></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Explore the results of the most recent assessment: </SPAN></SPAN><A href="https://apps.fs.usda.gov/gtac-toolsms/tca/" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>TCA Interactive Data Viewer</SPAN></SPAN></A></P><P><SPAN><SPAN>Learn more about the TCA KPI: </SPAN></SPAN><A href="https://cxodashboard.dl.usda.gov/t/NRE/views/EcologicalConditionOutcomes_17531128629260/EcologicalOutcomes" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>TCA Dashboard</SPAN></SPAN></A></P><P><SPAN><SPAN>*if you have trouble viewing the Dashboard, please submit a</SPAN></SPAN><SPAN><SPAN> </SPAN></SPAN><A href="https://usdagcc.sharepoint.com/sites/fs-wo-cdoc/SitePages/Dashboards.aspx" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Tableau Viewer Access Request</SPAN></SPAN></A></P></DIV></DIV></DIV>

Tags: encroachment, geospatial-office, grassland, tca, terrestrial-condition-assessment, usfs
Organization: Department of Agriculture