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Terrestrial Condition Assessment (TCA) Alaska Tree Mortality 0 to 5 years (Image Service)

Metadata Updated: October 2, 2025

Direct Download (Raster Data Gateway) Objective: Characterize recent impacts to terrestrial ecosystems due to outbreaks of major invasive, non-native, and native forest insects and pathogens.Data: Data are derived from aerial detection surveys for tree defoliation and mortality from the USFS Forest Health Assessment and Applied Sciences Team (FHAAST) National Forest Pest Conditions Database. Polygons are created by aerial sketch mapping, and coded for defoliation and mortality, in addition to other damage codes. Defoliation and mortality layers were created from the polygon data and the attribute codes. The layers were merged to compensate for difficulties in identifying defoliation separately from mortality in hardwoods vs. conifer forests. Areas that were defoliated during two of the five years in each time period have significant impacts and likely are experiencing mortality, so these polygons were added to the mortality layer. The layer includes areas with mortality classed as “very light”. There is a one-year lag between the source data and the TCA Assessment year. For instance, the 2024 TCA Assessment used data from 2019-2023 aerial detection surveys to calculate the 0-5 year mortality metric, with all other assessment years following this same pattern.Data Format: Raster data are binary: (1) presence or (0) absence. Spatial Resolution: 240m. Source data: USFS FHAAST custom productAdditional Resources:Details on Method Changes and Source Data VersionsOverview of the Terrestrial Condition Assessment: TCA Hubsite or Landfire Office Hour PresentationExplore the results of the most recent assessment: TCA Interactive Data ViewerLearn more about the TCA KPI: TCA Dashboard*if you have trouble viewing the Dashboard, please submit a Tableau Viewer Access Request

Access & Use Information

Public: This dataset is intended for public access and use. License: Creative Commons Attribution

Downloads & Resources

Dates

Metadata Created Date October 2, 2025
Metadata Updated Date October 2, 2025

Metadata Source

Harvested from USDA JSON

Additional Metadata

Resource Type Dataset
Metadata Created Date October 2, 2025
Metadata Updated Date October 2, 2025
Publisher U.S. Forest Service
Maintainer
Identifier https://www.arcgis.com/home/item.html?id=afd17fb328fe4413946369ba571895f2
Data First Published 2025-09-18
Data Last Modified 2025-09-23
Category geospatial
Public Access Level public
Bureau Code 005:96
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 5b3f5641-ba40-4e95-a90d-da6cbaf5648e
Harvest Source Id d3fafa34-0cb9-48f1-ab1d-5b5fdc783806
Harvest Source Title USDA JSON
Homepage URL https://data-usfs.hub.arcgis.com/datasets/usfs::terrestrial-condition-assessment-tca-alaska-tree-mortality-0-to-5-years-image-service
License https://creativecommons.org/licenses/by/4.0/
Metadata Type geospatial
Old Spatial -179.8824,49.6071,-121.0873,71.8283
Program Code 005:059
Progresscode onGoing
Source Datajson Identifier True
Source Hash 83fc4ea7b3b23553a1d60727d06cab9bf285e470fe5069b1975456d02ac22961
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -179.8824, 49.6071, -179.8824, 71.8283, -121.0873, 71.8283, -121.0873, 49.6071, -179.8824, 49.6071}

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