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Red Noctiluca scintillans is the main red tide species in China, which often occurs in the Bohai Sea, Yellow Sea, East China Sea and South China Sea. Recently, the red N. scintillans blooms occurred frequently, leading to an urgent need for their monitoring. However, the occurrence of red N. scintillans blooms is characterized by wide distribution range, rapid change and strip distribution. Therefore, the high spatial resolution, large coverage and short revisit period satellites are needed for red N. scintillans blooms monitoring. Although, ocean color satellites have played an important role in red tide detection, they cannot detect the strip distributed red N. scintillans blooms for their low spatial resolution. The Coastal Zone Imager (CZI) onboard HY-1C/D satellite, with high spatial resolution, wide swath and short revisit cycle, has been increasingly used for red tide monitoring. Most existing red N. scintillans blooms detection methods for HY-1C/D CZI are based on deep learning methods, which need a large number of training samples. However, the training samples are difficult to obtain, which affects the accuracy of the models. Therefore, taking red N. scintillans bloom occurred in the Honghai Bay, Guangdong Province in March 2022 as an example, the spectral features of red N. scintillans blooms were analyzed in this paper, the red tide detection method based on the high reflectance features of red N. scintillans blooms in the red and near infrared bands and turbid water in the green band was constructed for HY-1C/D CZI. The experimental results show that based on the method, red N. scintillans blooms can be detected effectively in the turbid water, with precision and F1-Score of 89.72% and 0.90 respectively. Moreover, the method has good applicability, and it is proved to be suitable for the detection of red N. scintillans blooms in different marine environments. Also, it is applicable to different broad band sensors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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