{ "snippet": "The TCA Uncharacteristic Disturbance indicators utilize two metrics (low and moderate) that identify areas burning more severely than expected based on Monitoring Trends in Burn Severity data. This time-enabled imagery layer contains moderate severity uncharacteristic disturbance for assessment years 2020-2024.", "summary": "The TCA Uncharacteristic Disturbance indicators utilize two metrics (low and moderate) that identify areas burning more severely than expected based on Monitoring Trends in Burn Severity data. This time-enabled imagery layer contains moderate severity uncharacteristic disturbance for assessment years 2020-2024.", "accessInformation": "USDA - GEO; USDA - USFS \u2013 Geospatial Office (GO)", "thumbnail": "thumbnail/thumbnail.png", "maxScale": 5000, "typeKeywords": [ "ArcGIS Server", "Data", "Image Service", "Service" ], "description": "

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

Objective:<\/span><\/span> The TCA Uncharacteristic Disturbance Indicator identifies locations that have had recent catastrophic disturbance including uncharacteristically severe wildfires resulting in needs for reforestation, revegetation or other restoration work.<\/span><\/span><\/p>

Data:<\/span><\/span> The LANDFIRE Historical Percent of Mixed Severity raster dataset for Alaska (AK_120_PMS) was combined with the Monitoring Trends in Burn Severity (MTBS) data (1984-most recent) and Composite Burn Index (Parks et al. 2018) data for the year prior to the assessment year derived from NIFC Fire Perimeters (>1000 ac) to identify areas that have experienced unnaturally severe wildfires in the recent past, since 1984. There is a 2-year lag between the most recent MTBS data and the TCA Assessment year (i.e. in the 2024 TCA Assessment, available MTBS data were from 1984-2022). To reduce this lag to 1 year, we compute the Composite Burn Index (CBI) for the year prior to the current assessment year using fire perimeters from National Interagency Fire Center (NIFC) with methods adapted from Parks et al. 2019. The CBI methods were added for the 2021 assessment. The \u201cModerate severity\u201d metric (layer) represents areas mapped with a dominant condition of mixed severity fire (based on PMS) but had a high severity MTBS fire in that location. <\/span><\/span><\/p>

Data Format:<\/span><\/span> Raster data are binary: (1) \u201cunnaturally severe fire\u201d or (0) other<\/span><\/span><\/p>

Spatial Resolution:<\/span><\/span> 30m<\/span><\/span><\/p>

Source data: <\/span><\/span>MTBS <\/span><\/span>fire severity<\/span><\/span><\/a>, <\/span><\/span>expected fire severity<\/span><\/span><\/a> , <\/span><\/span>CBI methods<\/span><\/span><\/a>, <\/span><\/span>National Interagency Fire Center Perimeters<\/span><\/span><\/a> (for CBI)<\/span><\/span><\/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": "

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><\/span><\/p>

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

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To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, found online at <\/span><\/span>How to File a Program Discrimination Complaint<\/span><\/span><\/a> 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: <\/span><\/span>program.intake@usda.gov<\/span><\/span><\/a>.<\/span><\/span><\/p>

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