{ "snippet": "Characterize moisture deficit and surplus for the most recent 3-year period relative to long-term average.", "summary": "Characterize moisture deficit and surplus for the most recent 3-year period relative to long-term average.", "accessInformation": "USDA - GEO; USDA - USFS \u2013 GO", "thumbnail": "thumbnail/thumbnail.png", "maxScale": 1155581.108577, "typeKeywords": [ "ArcGIS Server", "Data", "Image Service", "Service" ], "description": "

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

Objective:<\/span><\/span> Characterize current moisture deficit and surplus relative to the long-term average.<\/span><\/span><\/p>

Data:<\/span><\/span> <\/span><\/span>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 <\/span><\/span>t<\/span><\/span>-minus 4 (<\/span><\/span>t<\/span><\/span> = current TCA Assessment year). The greater the negative z-value, the larger the departure from average conditions, indicating larger moisture deficits.<\/span><\/span><\/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).<\/span><\/span><\/p>

Data Format:<\/span><\/span> Raster data are continuous<\/span><\/span><\/p>

Units: <\/span><\/span>Mean difference in z-score<\/span><\/span><\/p>

Spatial Resolution:<\/span><\/span> 4000m (4km)<\/span><\/span><\/p>

Source data:<\/span><\/span> <\/span><\/span>PRISM<\/span><\/span><\/a>; <\/span><\/span>z-score calculations provided by the USFS Office of Sustainability and Climate based on the methods found here: <\/span><\/span>https://www.fs.usda.gov/research/treesearch/43361<\/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>Tableau Viewer Access Request<\/span><\/span><\/a><\/p><\/div><\/div><\/div>", "licenseInfo": "

Terms of Use<\/span><\/p>

The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.<\/span><\/p>

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USDA is an equal opportunity provider, employer, and lender.<\/span><\/p><\/div><\/div><\/div>", "catalogPath": "", "title": "USFS_EDW_TCA_Drought", "type": "Image Service", "url": "https://imagery.geoplatform.gov/iipp", "tags": [ "TCA", "Terrestrial Condition Assessment", "Drought", "Climate", "PRISM", "CONUS", "Geospatial Office", "USFS" ], "culture": "en-US", "portalUrl": "", "name": "USFS_EDW_TCA_Drought", "guid": "", "minScale": 591657527.591555, "spatialReference": "WGS_1984_Web_Mercator_Auxiliary_Sphere" }