Research on the relationship between the fractional coverage of the submerged plant Vallisneria spiralis and observed sp
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Research on the relationship between the fractional coverage of the submerged plant Vallisneria spiralis and observed spectral parameters Qian Cheng & Kunqi Wu & Yan Bai & Yueming Hu
Received: 3 March 2012 / Accepted: 14 October 2012 / Published online: 24 October 2012 # Springer Science+Business Media Dordrecht 2012
Abstract The present paper discusses the relationship between the coverage fraction of submerged plants and the observed spectral characteristics. The purpose of this paper is to validate a remote sensing technology to monitor the change in the plant composition of a water body. In the current study, the reflectance spectra of the submerged plant Vallisneria spiralis at different fraction coverages of the wetland in Hangzhou Bay were measured. The relationships between the fraction coverage of V. spiralis and simulated Quickbird normalized difference vegetation index (NDVI), red edge, and other spectral characteristic parameters were established. The results showed that the spectral reflectance characteristics Q. Cheng (*) : K. Wu Department of Environmental Resources Management and City Planning, Zhejiang Gongshang University, No. 149, JiaoGong Road, 310035 Hangzhou, Zhejiang Province, People’s Republic of China e-mail: [email protected] Y. Bai Second Institute of Oceanography, State Oceanic Administration, 310012 Hangzhou, Zhejiang Province, People’s Republic of China Y. Hu College of Information, South China Agricultural University, 510642 Guangzhou, Guangdong Province, People’s Republic of China
of submerged plant V. spiralis were mainly in the visible light (490–650 nm) and near infrared (700–900 nm). The rate of change of the blue band curve and simulated Quickbird NDVI showed a higher correlation with the V. spiralis coverage, so estimation models of the fraction coverage were constructed using these parameters. The estimated fraction coverage of V. spiralis with different models were validated with ground data, and the accuracy of estimation models was assessed. The most suitable estimated fraction coverage of V. spiralis was obtained using the rate of change of the blue band curve and simulated Quickbird NDVI. The present work demonstrated a method to monitor the distribution and dynamical variation of submerged plants at the large scale. Keywords Fraction coverage . Submerged plant . Quickbird NDVI . Spectral characteristic . Red edge
Introduction Submerged plants play a major role in coastal estuary and wetland ecosystems. Remote sensing has become a major technique to obtain information on the surface covers and their constituents and has been widely applied to monitor resources and the environment dynamically (Roughgarden et al. 1991; Xu et al. 1996). Many researchers have started exploring the temporal and spatial variations of submerged plants with remote sensing techniques. For example, remote sensing was used to estimate the coverage of submerged plants in lower
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Chesapeake Bay, and the estimated result was compared with that from the TM image of Landsat-MSS (Ackleson and K
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