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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 }