AIRBORNE REMOTE SENSING OF MACROPHYTES IN CEFNI RESERVOIR, ANGLESEY, UK

Abstract This paper evaluates the use of Daedalus Airborne Thematic Mapper (ATM) remotely sensed imagery for monitoring the distribution of aquatic macrophyte species in Cefni Reservoir on the Isle of Anglesey. Images acquired by the ATM were compared to spectroradiometric measurements of the reflectance characteristics of the water and selected stands of submersed floating-leaved and emergent macrophytes. The information content of individual and combinations of ATM spectral bands were investigated for mapping macrophyte distributions. Discriminant analysis performed on both data sets indicated that good identification of macrophytes could be achieved by a combination of green, red and near infrared wavebands. A minimum distance supervised classifier using ATM bands 3, 7 and 8 showed separation of the species surveyed. The results indicate that airborne remotely sensed data have good potential for monitoring freshwater macrophyte species.

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