We visually derived three acoustic features from the echograms using simple sonar.
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We distinguished 2 macrophytes groups by setting a threshold based on in situ data.
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Short plants (<20 cm) mainly corresponded to charophytes, otherwise to angiosperms.
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The discrimination between these groups was more expressed in deeper areas (>1 m).
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This method can be used for the detection of their maximum depth distribution limit.
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