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    • Tongass Landslide Areas (Feature Layer)

    Metadata Updated: April 1, 2026

    This is a once-over landslide inventory of the Tongass National Forest. This inventory includes all mass wasting features, including talus slopes, snow avalanche fields, and snow avalanche chutes. Each of these are coded differently in the attributes. It may be necessary to exclude several polygons in this data set when using it to determine landslide rates. Most of these landslide polygons were digitized on the 1998 to 2010 orthophotos in GIS. Many of them were age bracketed using air photos back to the 1929 Navy Trimegon photos. It includes both field and photo interpreted landslides. Not all of the landslides included once-over completed in FY2017 were age bracketed. There is an associated Points feature class (Tongass_Landslide_Initiation) that represents the landslide initiation zone approximations. These points only exist for true landslides: debris avalanches, debris torrents, combination debris avalanches/torrents, slumps, rotation failures, and rock fall-initiated failures.�Metadata

    Access & Use Information

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

    Downloads & Resources

    Dates

    Metadata Created Date November 3, 2022
    Metadata Updated Date April 1, 2026

    Metadata Source

    Harvested from USDA JSON

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 3, 2022
    Metadata Updated Date April 1, 2026
    Publisher U.S. Forest Service
    Maintainer
    Identifier https://www.arcgis.com/home/item.html?id=112e05629a304613b4fda6057225d60d&sublayer=1
    Data First Published 2019-09-16
    Data Last Modified 2022-08-25
    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 6885a153-710d-41df-9905-cf0fb240d00e
    Harvest Source Id d3fafa34-0cb9-48f1-ab1d-5b5fdc783806
    Harvest Source Title USDA JSON
    Homepage URL https://data-usfs.hub.arcgis.com/datasets/usfs::tongass-landslide-areas-feature-layer
    License https://creativecommons.org/licenses/by/4.0/
    Metadata Type geospatial
    Old Spatial -139.6561,54.5625,-129.5162,60.1176
    Program Code 005:059
    Progresscode onGoing
    Source Datajson Identifier True
    Source Hash 5fdea830794fe8300591681e33c10dcfa8b3da06bd71a3bed69c1218c174f72a
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -139.6561, 54.5625, -139.6561, 60.1176, -129.5162, 60.1176, -129.5162, 54.5625, -139.6561, 54.5625}

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