Terrestrial Condition Assessment (TCA) Recent Drought Impacts (Image Service)

<div><div><div><p><a href="https://data.fs.usda.gov/geodata/rastergateway/TCA/TCA_Drought_Impacts.zip">Direct Download (Raster Data Gateway)</a></p><p>Objective: Characterize current moisture deficit and surplus relative to the long-term average.</p><p>Data: The indicator represents areas of moisture deficit as a z-score. A z-score is a statistical method for assessing how different a value (i.e., most recent 3 years) is from the mean (historical average). The source climate data is from PRISM. Mean moisture values were derived from historical data on precipitation and Thornthwaite potential evapotranspiration, from 1900 to t-minus 4 (t = current TCA Assessment year). The greater the negative z-value, the larger the departure from average conditions, indicating larger moisture deficits.</p><p>These data highlight regions of moisture deficit as a z-score calculated from the reference time period and current conditions. There is a lag between the assessment year and the most recent drought data, for example, the 2024 TCA Assessment used 2021-2023 to represent current conditions and 1900-2020 for the reference time period. Data were summarized at the Subsection scale of the USFS National Hierarchy of Ecological Units and applied to the corresponding landscape (LTA).</p><p>Data Format: Raster data are continuous</p><p>Units: Mean difference in z-score</p><p>Spatial Resolution: 4000m (4km)</p><p>Source data: <a href="http://www.prism.oregonstate.edu/">PRISM</a>; z-score calculations provided by the USFS Office of Sustainability and Climate based on the methods found here: <a href="https://www.fs.usda.gov/research/treesearch/43361">https://www.fs.usda.gov/research/treesearch/43361</a></p><p>Additional Resources:</p><p>Details on <a href="https://usfs.box.com/s/79vx1b42xg8u6ivjombxjes36nzfhgml">Method Changes and Source Data Versions</a></p><p>Overview of the Terrestrial Condition Assessment: <a href="https://terrestrial-condition-assessment-usfs.hub.arcgis.com/">TCA Hubsite</a> or <a href="https://www.youtube.com/watch?v=Kf0P3cAq1rs&list=PLwRbAc4x5n94rLca1CXXuugtRDt_G666M&index=19">Landfire Office Hour Presentation</a></p><p>Explore the results of the most recent assessment: <a href="https://apps.fs.usda.gov/gtac-toolsms/tca/">TCA Interactive Data Viewer</a></p><p>Learn more about the TCA KPI: <a href="https://cxodashboard.dl.usda.gov/t/NRE/views/EcologicalConditionOutcomes_17531128629260/EcologicalOutcomes">TCA Dashboard</a></p><p>*if you have trouble viewing the Dashboard, please submit a <a href="https://usdagcc.sharepoint.com/sites/fs-wo-cdoc/SitePages/Dashboards.aspx">Tableau Viewer Access Request</a></p></div></div></div><div><br>This record was taken from the USDA Enterprise Data Inventory that feeds into the <a href="https://data.gov">https://data.gov</a> catalog. Data for this record includes the following resources:</div><ul><li> <a href="https://www.arcgis.com/sharing/rest/content/items/ae261139bd194df2b97bf18c70f6de8d/info/metadata/metadata.xml?format=iso19139 "> ISO-19139 metadata</a></li><li> <a href="https://data-usfs.hub.arcgis.com/datasets/usfs::terrestrial-condition-assessment-tca-recent-drought-impacts-image-service "> ArcGIS Hub Dataset</a></li><li> <a href="https://imagery.geoplatform.gov/iipp/rest/services/Ecosystems/USFS_EDW_TCA_Drought/ImageServer "> ArcGIS GeoService</a></li></ul><div> For complete information, please visit <a href="https://data.gov">https://data.gov</a>.</div>