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

Objective:<\/span><\/span> Characterize recent drought severity in Alaska. <\/span><\/span><\/p>

Data:<\/span><\/span> <\/span><\/span>The indicator represents drought severity as a weighted sum of the number of droughts in each category over the most recent 3-year period using data from the U.S. Drought Monitor. A 30km grid was overlaid on Alaska and the number of droughts in each category we calculated over the time period. The weighted sum of droughts (<\/span><\/span>DwSum<\/span><\/span>) was calculated using the equation:<\/span><\/span><\/p>

<\/span>(D0 [abnormally dry] * 1) + (D1 [moderate drought] *2) + (D2 [severe drought] * 3) + (D3 [extreme drought] * 4) + (D4 [exceptional drought] * 5)<\/span><\/span><\/p>

There is a lag between the assessment year and the most recent drought data, for example, the 2024 TCA Assessment used drought data from 2021-2023. 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>Number of droughts (weighted sum)<\/span><\/span><\/p>

Spatial Resolution:<\/span><\/span> 30000m (30km)<\/span><\/span><\/p>

Source data:<\/span><\/span> <\/span><\/span>US Drought Monitor<\/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>", "allowCopy": true, "copyrightText": "USDA - GEO; USDA - USFS \u2013 GO", "mensurationCapabilities": "Basic", "ownershipBasedAccessControlForRasters": null }