Terrestrial Condition Assessment (TCA) Alaska Uncharacteristic Fire Severity Moderate (Image Service)

<div style='text-align:Left;'><div><div><p style='font-weight:bold;'><a href='https://data.fs.usda.gov/geodata/rastergateway/TCA/Alaska/06_Uncharacteristic_Disturb/TCA_AK_Uncharacteristic_Disturbance_Mod.zip' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>Direct Download (Raster Data Gateway)</span></span></a><span style='text-decoration:underline;'><span> </span></span></p><p><span style='font-weight:bold;'><span>Objective:</span></span><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><p><span style='font-weight:bold;'><span>Data:</span></span><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 (&gt;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 “Moderate severity” 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><p><span style='font-weight:bold;'><span>Data Format:</span></span><span><span> Raster data are binary: (1) “unnaturally severe fire” or (0) other</span></span></p><p><span style='font-weight:bold;'><span>Spatial Resolution:</span></span><span><span> 30m</span></span></p><p><span style='font-weight:bold;'><span>Source data: </span></span><a href='http://mtbs.gov/' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>MTBS </span></span><span style='text-decoration:underline;'><span>fire severity</span></span></a><span><span>, </span></span><a href='https://landfire.gov/fire-regime/pfs' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>expected fire severity</span></span></a><span><span> , </span></span><a href='https://www.mdpi.com/2072-4292/11/14/1735' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>CBI methods</span></span></a><span><span>, </span></span><a href='https://data-nifc.opendata.arcgis.com/datasets/nifc::wfigs-interagency-fire-perimeters/about' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>National Interagency Fire Center Perimeters</span></span></a><span><span> (for CBI)</span></span></p><p style='font-weight:bold;'><span><span>Additional Resources:</span></span></p><p><span><span>Details on </span></span><a href='https://usfs.box.com/s/79vx1b42xg8u6ivjombxjes36nzfhgml' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>Method Changes and Source Data Versions</span></span></a></p><p><span><span>Overview of the Terrestrial Condition Assessment: </span></span><a href='https://terrestrial-condition-assessment-usfs.hub.arcgis.com/' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>TCA Hubsite</span></span></a><span><span> or </span></span><a href='https://www.youtube.com/watch?v=Kf0P3cAq1rs&amp;list=PLwRbAc4x5n94rLca1CXXuugtRDt_G666M&amp;index=19' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>Landfire Office Hour Presentation</span></span></a></p><p><span><span>Explore the results of the most recent assessment: </span></span><a href='https://apps.fs.usda.gov/gtac-toolsms/tca/' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>TCA Interactive Data Viewer</span></span></a></p><p><span><span>Learn more about the TCA KPI: </span></span><a href='https://cxodashboard.dl.usda.gov/t/NRE/views/EcologicalConditionOutcomes_17531128629260/EcologicalOutcomes' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>TCA Dashboard</span></span></a></p><p><span><span>*if you have trouble viewing the Dashboard, please submit a </span></span><a href='https://usdagcc.sharepoint.com/sites/fs-wo-cdoc/SitePages/Dashboards.aspx' style='text-decoration:underline;'><span style='text-decoration:underline;'><span>Tableau Viewer Access Request</span></span></a></p></div></div></div>

[
  "005:96"
]

[
  "005:059"
]

[
  "geospatial"
]