Tongass Landslide Areas (Feature Layer)

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

Data and Resources

Field Value
accessLevel public
bureauCode {005:96}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier https://www.arcgis.com/home/item.html?id=112e05629a304613b4fda6057225d60d&sublayer=1
issued 2019-09-16
landingPage https://data-usfs.hub.arcgis.com/datasets/usfs::tongass-landslide-areas-feature-layer
license https://creativecommons.org/licenses/by/4.0/
metadata_type geospatial
modified 2022-08-25
old-spatial -139.6362,54.6694,-130.0157,59.9924
programCode {005:059}
progressCode onGoing
publisher U.S. Forest Service
resource-type Dataset
source_datajson_identifier true
source_hash 699244f0324e668c69afdde4e7e91e94bf3373238c79f38bbc254d42eb06ec1d
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-139.6362, 54.6694], [-139.6362, 59.9924], [-130.0157, 59.9924], [-130.0157, 54.6694], [-139.6362, 54.6694]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • avalanche
  • landslides
  • mass-wasting
  • open-data
  • tongass-national-forest
isopen True
license_id cc-by
license_title Creative Commons Attribution
license_url http://www.opendefinition.org/licenses/cc-by
maintainer USFSEnterpriseContent
maintainer_email SM.FS.data@usda.gov
metadata_created 2025-09-24T15:40:58.166323
metadata_modified 2025-09-24T15:40:58.166329
notes 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.�<a href='https://data.fs.usda.gov/geodata/edw/datasets.php?xmlKeyword=tongass' target='_blank' rel='nofollow ugc noopener noreferrer'>Metadata</a>
num_resources 8
num_tags 13
title Tongass Landslide Areas (Feature Layer)