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篇目详细内容 |
【篇名】 |
Spectral signatures of hydrilla from a tank and field setting |
【刊名】 |
Frontiers of Earth Science |
【刊名缩写】 |
Front. Earth Sci |
【ISSN】 |
2095-0195 |
【EISSN】 |
2095-0209 |
【DOI】 |
10.1007/s11707-012-0331-1 |
【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
【出版年】 |
2012 |
【卷期】 |
6
卷4期 |
【页码】 |
453-460
页,共
8
页 |
【作者】 |
Alfonso BLANCO;
John J. QU;
William E. ROPER;
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【关键词】 |
Chesapeake Bay; hydrilla; spectral library; spectral signatures; near-infrared; NDVI |
【摘要】 |
The invasion of hydrilla in many waterways has caused significant problems resulting in high maintenance costs for eradicating this invasive aquatic weed. Present identification methods employed for detecting hydrilla invasions such as aerial photography and videos are difficult, costly, and time consuming. Remote sensing has been used for assessing wetlands and other aquatic vegetation, but very little information is available for detecting hydrilla invasions in coastal estuaries and other water bodies. The objective of this study is to construct a library of spectral signatures for identifying and classifying hydrilla invasions. Spectral signatures of hydrilla were collected from an experimental tank and field locations in a coastal estuary in the upper Chesapeake Bay. These measurements collected from the experimental tank, resulted in spectral signatures with an average peak surface reflectance in the near-infrared (NIR) region of 16% at a wavelength of 818?nm. However, the spectral measurements, collected in the estuary, resulted in a very different spectral signature with two surface reflectance peaks of 6% at wavelengths of 725?nm and 818?nm. The difference in spectral signatures between sites are a result of the components in the water column in the estuary because of increased turbidity (e.g., nutrients, dissolved matter and suspended matter), and canopy being lower (submerged) in the water column. Spectral signatures of hydrilla observed in the tank and the field had similar characteristics with low reflectance in visible region of the spectrum from 400 to 700?nm, but high in the NIR region from 700 to 900?nm. |
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