• Login
    View Item 
    •   Home
    • University of Alaska Fairbanks
    • College of Fisheries and Ocean Sciences (CFOS)
    • Fisheries
    • Pegus, Courtney
    • View Item
    •   Home
    • University of Alaska Fairbanks
    • College of Fisheries and Ocean Sciences (CFOS)
    • Fisheries
    • Pegus, Courtney
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Scholarworks@UACommunitiesPublication DateAuthorsTitlesSubjectsTypeThis CollectionPublication DateAuthorsTitlesSubjectsType

    My Account

    Login

    First Time Submitters, Register Here

    Register

    Statistics

    Display statistics

    Evaluating the Accuracy of Unmanned Aerial Systems to Quantify Glacial Ice Habitats of Harbor Seals in Alaska

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Data_Sheet_Manuscript_ECS21_07 ...
    Size:
    26.98Kb
    Format:
    Microsoft Excel 2007
    Description:
    Experiment data readings
    DownloadPDF Variant
    Author
    Pegus, Courtney
    Atkinson, Shannon
    Quinn, Terry
    Pyare, Sanjay
    Keyword
    Icebergs, Tidewater Glaciers, Harbor seal, Unmanned aerial systems, Drones
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/12493
    Abstract
    Long-term monitoring programs to evaluate climate-driven changes to tidewater glaciers, an important habitat for harbor seals (Phoca vitulina) in Alaska, are primarily carried out by costly, weather-dependent aerial surveys from fixed-winged aircraft. Unmanned aerial systems (UAS) can be an alternative cost-effective solution for gathering image data to quantify, monitor, and manage these habitats. However, there is a paucity of information related to the accuracy of using imagery collected by UAS for purposes of measuring floating icebergs. We evaluated the accuracy of using a UAS with a built-in 20 megapixel (MP) camera as well as a consumer-grade digital 16 MP camera to capture images of floating and stationary icebergs for the purpose of collecting vertical height measurements. Images (n=869) were captured of simulated icebergs (Cuboidal foam boxes) “Cb” (n=5) and real icebergs (n=5) that were either grounded or floating. The mean error ratios obtained were less than 10% and derived by comparing the mean calculated measurements of heights of Cb obtained from images captured by UAS with the physical measured heights of these Cb. The mean error ratio for height measurements of grounded icebergs (n=4) and one floating iceberg was also less than 10%. Within an object-image distance range of 6-25 m, the cameras captured images that were suitable to accurately calculate the heights of floating and grounded objects, and drift or uncontrolled movement of the UAS caused by wind or temporary loss of GPS did not appear to have any significant effects on measurement error. Our study provides substantial evidence of the high accuracy associated with using images captured by UAS for measuring dimensions of structures positioned on water and land surfaces. Ultimately, accurate surveys of glacial ice used by harbor seals will improve our understanding about the role of decreasing habitat in explaining population variability between different tidewater glaciers.
    Date
    2021-11-17
    Source
    Ecosphere
    Publisher
    Wiley-Blackwell
    Peer-Reviewed
    Yes
    Collections
    Pegus, Courtney

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution and is a part of the University of Alaska system.

    ©UAF 2013 - 2022 | Questions? ua-scholarworks@alaska.edu | Last modified: September 25, 2019

    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.