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    • Topographic Wetness Index raster - Land Cover Mapping, North Slope of the Arctic National Wildlife Refuge, Alaska, 2019

    Metadata Updated: February 22, 2025

    "We obtained the 5 m Interferometric Synthetic Aperture Radar Digital Terrain Model (IFSAR DTM) tiles for the study area from https://elevation.alaska.gov/ and mosaicked the products into a single image. We aggregated the DTM to 30 m resolution to represent a more generalized landscape level, and also to allow fairly rapid calculation of more processing-intensive terrain metrics. We then calculated the Sage Topographic Wetness Index at 30 m resolution. This integrates the local slope and the upstream contributing terrain in a continuous metric representing the potential wetness.

    The 'SAGA Wetness Index' is, as the name says, similar to the 'Topographic Wetness Index' (TWI), but it is based on a modified catchment area calculation ('Modified Catchment Area'), which does not think of the flow as very thin film. As result it predicts for cells situated in valley floors with a small vertical distance to a channel a more realistic, higher potential soil moisture compared to the standard TWI calculation."

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    References

    https://iris.fws.gov/APPS/ServCat/Reference/Profile/130646

    Dates

    Metadata Created Date June 1, 2023
    Metadata Updated Date February 22, 2025

    Metadata Source

    Harvested from DOI EDI

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date June 1, 2023
    Metadata Updated Date February 22, 2025
    Publisher U.S. Fish and Wildlife Service
    Maintainer
    @Id http://datainventory.doi.gov/id/dataset/de5925b96cb2df712b253b4068c57426
    Identifier FWS_ServCat_130646
    Data First Published 2020-06-01T12:00:00Z
    Data Last Modified 2020-06-01
    Category geospatial
    Public Access Level public
    Bureau Code 010:18
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://datainventory.doi.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Data Quality True
    Harvest Object Id b856e5de-f387-49ab-af0c-65933a086f10
    Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
    Harvest Source Title DOI EDI
    Homepage URL https://iris.fws.gov/APPS/ServCat/Reference/Profile/130646
    Metadata Type geospatial
    Old Spatial -149.387222,66.7421341,-141.000626,70.1697845
    Program Code 010:028, 010:094
    Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Fish and Wildlife Service
    Related Documents https://iris.fws.gov/APPS/ServCat/Reference/Profile/130646
    Source Datajson Identifier True
    Source Hash 2456ffbfbbc804492595f5a460ce099d46882eced794bc0ed53be5119f5c03fe
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -149.387222, 66.7421341, -149.387222, 70.1697845, -141.000626, 70.1697845, -141.000626, 66.7421341, -149.387222, 66.7421341}
    Temporal 2018-10-01T12:00:00Z/2019-07-01T12:00:00Z

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