Full
KONG Min, senior engineer, majors in processing and analysis of marine geophysical data, E-mail: km_nmdis@163.com
Outline
This paper collects 227 marine gravity datasets obtained by Japan through ship borne surveys in its surrounding waters and the northwest Pacific. Statistical analysis, visualization mapping, and correlation analysis methods are used to analyze the gravity survey situation and data quality. This paper systematically analyzes the history, spatiotemporal distribution characteristics, and quality of gravity data surveys in Japan. The results show that ship measured gravity data has good consistency with GEBCO terrain data and DTU gravity model data, while the gravity data has a correlation of 0.98 and a root mean square error of 7.7 mGal with the DTU21. This paper establishes a trajectory intersection point difference model and analyzes the data measurement accuracy using intersection point difference error. The total crossover points are 73 979 with an crossover error of 11.85 mGal, the internal crossover point are 24 822 with an crossover error of 9.56 mGal, and the external crossover point are 49 157 with an crossover error of 12.85 mGal. The overall accuracy of the gravity data measurement accuracy is high, and the consistency is good.
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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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