Efficacy of aerial photography analyses for determining disturbances in aquatic ecosystems

riparian vegetation structure and channel morphology. Field data and historical aerial photographs were used for the analyses of a 500 m section of the Upper East Fork Salmon River located in central Idaho. Analyses of aerial photographs were performed in ERDAS Imagine 8.7 and Leica Photogrammetry S...

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Bibliographic Details
Published in:Canadian journal of remote sensing 2008-11, Vol.34 (sup2), p.S364-S375
Main Authors: Lanspery, Katherine E, Robberecht, Ronald
Format: Article
Language:English
Subjects:
Aerial photography
Aerial surveying
Aerials
Aquatic ecosystems
Channels
Disturbances
Geographic information systems
Habitats
Remote sensing
Salmon
Vegetation
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Summary:riparian vegetation structure and channel morphology. Field data and historical aerial photographs were used for the analyses of a 500 m section of the Upper East Fork Salmon River located in central Idaho. Analyses of aerial photographs were performed in ERDAS Imagine 8.7 and Leica Photogrammetry Suite, consisting of orthorectification, measurement, and qualitative interpretation. Our results indicate that the mean channel width has decreased significantly over the observation period, but fluctuations in channel width occurred in the area of depositional features because of the maintenance and recovery from frequent flooding events. Significant improvements in habitat condition did not occur after the decrease of grazing intensity in 1999. However, significant changes in habitat occurred over the entire 27-year period. Remote sensing analyses using aerial photography proved to be an efficient, user-friendly method to detect long-term ecological trends in aquatic systems in relation to disturbance.
ISSN:0703-8992
1712-7971
DOI:10.5589/m08-045