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    • Rangeland Ecology & Management, Volume 62 (2009)
    • Rangeland Ecology & Management, Volume 62, Number 3 (May 2009)
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    Agreement Between Measurements of Shrub Cover Using Ground-Based Methods and Very Large Scale Aerial Imagery

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    Author
    Moffet, Corey A.
    Issue Date
    2009-05-01
    Keywords
    antelope bitterbrush
    georeferencing
    limit-of-agreement analysis
    mountain big sagebrush
    spineless horsebrush
    
    Metadata
    Show full item record
    Citation
    Moffet, C. A. (2009). Agreement between measurements of shrub cover using ground-based methods and very large scale aerial imagery. Rangeland Ecology & Management, 62(3), 268-277.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643027
    DOI
    10.2111/08-244R.1
    Additional Links
    https://rangelands.org/
    Abstract
    Very large scale aerial (VLSA) photography is a remote sensing method, which is collected and analyzed more efficiently than ground-based measurement methods, but agreement with ground-based measurements needs to be quantified. In this study, agreement between ground- and image-measured cover and precision, and accuracy of image locations and scale, were assessed. True image locations were determined by georeferencing images and conducting a ground search. Accuracy and precision of planned, aircraft, and georeferenced locations were evaluated by comparison with true image locations. Shrub cover was measured at true image locations using ground-based line-intercept and on the image using point-intercept. Sagebrush (Artemisia spp. L.), antelope bitterbrush (Purshia tridentata [Pursh] DC.), and spineless horsebrush (Tetradymia canescens DC.) were distinguished in the imagery. Agreement between ground- and image-based measurements was quantified using limit-of- agreement analysis. True ground locations of the VLSA images were within a 41-m radius of the aircraft location at the time of image acquisition, with 95% confidence. Using a panchromatic image from the QuickBird satellite (0.6-m pixel resolution) as a base map, 90% of true ground locations were within a 5-m radius of the location estimated from georeferencing the VLSA image to the base map. VLSA image-measured cover was, in general, unbiased with mean absolute differences between VLSA- and ground-based methods less than 1.3%. The degree of agreement and absence of bias between VLSA image-measured and ground-measured cover is sufficient to recommend using VLSA imagery to measure shrub cover. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-244R.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 3 (May 2009)

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