β Scribed by Touria Bajjouk; Brigitte Guillaumont; Jacques Populus
No coin nor oath required. For personal study only.
The aim of this paper is to test the ability of imaging radiometers to describe the principal seaweed and seagrass beds along the coast of Brittany (France) . In this work we used CASI, an instrument with programmable narrow bands . On the ground, regions of homogeneous vegetation cover were mapped using differential GPS positioning . Ground spectra were recorded with a field spectroradiometer (Spectron SE 590), for substratum and different species . Their analysis shows variations in relation to pigment characteristics, vegetation structure and environmental conditions .
An algorithm sequence based on field work and according to the technical sensor characteristics, was developed to discriminate the dominant species . The classified CASI image was compared with ground data . The main results are the following (a) the visible wavelengths allow good discrimination between green, red and brown algae . (b) the infrared wavelengths allow separation of two main types of brown species, seagrasses and the identification of floating seaweed .
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