期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 16, 期 15, 页码 -出版社
MDPI
DOI: 10.3390/ijerph16152701
关键词
seagrass; reflectance; epiphytes; growing depth; optically shallow coastal waters; remote sensing; benthic bottom type
资金
- 2012-2013 Premier's Research and Industry Fund (PRIF), a part of the Department of Further Education, Employment, Science, and Technology (DFEEST), Government of South Australia, Australia [CS7665]
- National Cheng Kung University (NCKU) Distinguished International Student Scholarship
- NCKU Dept. of Engineering International Student Scholarship
- NCKU Dept. of Engineering Research Assistantship
- CTCI Foundation Scholarship for Overseas Graduate Students
Seagrasses are a crucial indicator species of coastal marine ecosystems that provide substratum, shelter, and food for epiphytic algae, invertebrates, and fishes. More accurate mapping of seagrasses is essential for their survival as a long-lasting natural resource. Before reflectance spectra could properly be used as remote sensing endmembers, factors that may obscure the detection of reflectance signals must be assessed. The objectives in this study are to determine the influence of (1) epiphytes, (2) water depth, and (3) seagrass genus on the detection of reflectance spectral signals. The results show that epiphytes significantly dampen bottom-type reflectance throughout most of the visible light spectrum, excluding 670-679 nm; the depth does influence reflectance, with the detection of deeper seagrasses being easier, and as the depth increases, only Heterozostera increase in the exact red edge wavelength at which there is a rapid change in the near-infrared (NIR) spectrum. These findings helped improve the detection of seagrass endmembers during remote sensing, thereby helping protect the natural resource of seagrasses.
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