{ "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": 5000, "typeKeywords": [ "ArcGIS Server", "Data", "Image Service", "Service" ], "description": "

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>", "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>

Non-Discrimination Statement<\/span><\/p>

In accordance with Federal civil rights law and U.S. Department of Agriculture (USDA) civil rights regulations and policies, the USDA, its Agencies, offices, and employees, and institutions participating in or administering USDA programs are prohibited from discriminating based on race, color, national origin, religion, sex, disability, age, marital status, family/parental status, income derived from a public assistance program, political beliefs, or reprisal or retaliation for prior civil rights activity, in any program or activity conducted or funded by USDA (not all bases apply to all programs). Remedies and complaint filing deadlines vary by program or incident.<\/span><\/p>

Persons with disabilities who require alternative means of communication for program information (e.g., Braille, large print, audiotape, American Sign Language, etc.) should contact the State or local Agency that administers the program or contact USDA through the Telecommunications Relay Service at 711 (voice and TTY). Additionally, program information may be made available in languages other than English.<\/span><\/p>

To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, found online at How to File a Program Discrimination Complaint and at any USDA office or write a letter addressed to USDA and provide in the letter all of the information requested in the form. To request a copy of the complaint form, call (866) 632-9992. Submit your completed form or letter to USDA by: (1) mail: U.S. Department of Agriculture, Office of the Assistant Secretary for Civil Rights, 1400 Independence Avenue, SW, Mail Stop 9410, Washington, D.C. 20250-9410; (2) fax: (202) 690-7442; or (3) email: program.intake@usda.gov.<\/span><\/p>

USDA is an equal opportunity provider, employer, and lender.<\/span><\/p><\/div><\/div><\/div>", "catalogPath": "", "title": "USFS_EDW_TCA_AK_Drought", "type": "Image Service", "url": "", "tags": [ "TCA", "Terrestrial Condition Assessment", "Drought", "Climate", "PRISM", "Geospatial Office", "USFS", "AK", "Alaska" ], "culture": "en-US", "portalUrl": "", "name": "USFS_EDW_TCA_AK_Drought", "guid": "", "minScale": 150000000, "spatialReference": "WGS_1984_Web_Mercator_Auxiliary_Sphere" }