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国际深海资源的勘查和开发,积累了大量珍贵的大洋样品和分析测试数据。为完成多源异构海洋地质化学数据的自动集成和智能检索,设计了基于大洋样品本体模型的大洋样品地质化学数据互操作系统。系统为三层架构,分别是数据层、语义层和应用层。数据层完成了数据汇交模板定制;语义层完成了模式和语义互操作;应用层完成了基于语义的一站式数据检索。系统在ODP-ICP-AES、PetDB、GEOROC3个数据库模型上进行了实验,实验结果显示:该系统在确保数据源独立性、安全性、时效性的前提下,实现了海量大洋调查数据和模型的复用。 相似文献
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针对已有养殖浮筏提取研究中未考虑多时相、特征多样性问题,提出了一种基于改进DeepLab v3+模型的养殖浮筏提取方法。通过依据多年份Sentinel-2遥感影像构建了养殖浮筏影像数据集;更改模型中ASPP模块结构为DenseASPP并优化膨胀率;替换原特征提取网络Xception为轻量化网络MobileNet v2;增加CBAM注意力机制模块,在顾及多时相、特征多样性养殖浮筏基础上,有效提升了模型的提取精度和效率。以覆盖长海县的Sentinel-2遥感影像为数据源进行实验,结果表明:改进DeepLab v3+模型各评价指标均高于DeepLab v3+模型,精确率、准确率分别达到了89.64%、88%。 相似文献
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《海洋技术学报》2023,(4)
水深是重要的海洋要素,水深遥感反演是获取浅水水深的重要手段。当前水深遥感反
演应用以国外卫星数据为主,国产卫星数据的研究和应用较少。本文针对国产高分六号卫星
(GF-6) 数据,以三亚南山港为研究区域,分别建立单波段回归模型、双波段比值模型、多波段
回归模型,进行多光谱影像的水深反演能力研究,并与国外主流哨兵2 号卫星(Sentinel-2) 数
据进行实验比较。实验结果表明:GF-6 遥感影像具有较好的浅水水深反演能力和一定的反演精度,各波段水深探测能力依次为:绿波段跃蓝波段跃红波段跃近红外波段,反演方法效果依次为:多波段模型跃双波段模型跃单波段模型。相较于Sentinel-2 数据,GF-6 数据水深反演精度与其一致,这表明GF-6 影像具备替代国外遥感数据进行水深反演的能力和大规模应用的潜力。本文针对GF-6 影像水深反演能力的研究方法和分析,结果将为国产高分系列卫星数据的水深反演研究和应用提供有益的参考。 相似文献
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本文使用Landsat-8影像、Sentinel-2影像、高分6号影像和ASTER GDEM数据等多源遥感数据,采用随机森林监督分类方法提取珠海淇澳岛红树林分布范围,对比不同影像数据提取红树林的精度及适用性。实验结果表明:使用三类遥感影像分别进行红树林范围提取,Sentinel-2影像提取红树林范围总体精度最高;在三类遥感影像中分别增加DEM数据、波段指数和纹理信息后,红树林范围提取精度可进一步提升;增加DEM数据后,精度提升最明显,高分6号影像增加纹理信息后,精度也有较大提升。通过对比可知,Sentinel-2影像拥有较多的光谱波段及适中的空间分辨率,是最合适的红树林范围提取数据源,而ASTER GDEM数据便于区分红树林和陆生植被,是比较好的辅助数据。通过对多源遥感影像及辅助数据提取红树林范围进行对比分析,为红树林遥感提取数据源选取及红树林提取精度提升提供了参考和借鉴。 相似文献
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Research on cloud computing and services framework of marine environmental information management 总被引:1,自引:1,他引:0
Based on the features of marine environmental data and processing requirements, a cloud computing archi- tecture of marine environment information is proposed, which provides a new cloud technology framework for the integration and sharing of marine environmental information resources. A physical layer, software platform layer and an application layer are illustrated systematically, at the same time, a corresponding solu- tions for many difficult technical problems such as parallel query processing of multi-dimensional, spatio- temporal information, data slice storage, software service flow customization, analysis, reorganization and so on. A prototype system is developed and many different data-size experiments and a comparative analy- sis are done based on it. The experiment results show that the cloud platform based on this framework can achieve high performance and scalability when dealing with large-scale marine data. 相似文献
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《Marine Geodesy》2012,35(1):1-22
AbstractThe deep seafloor is closest to the Earth’s interior and there are complicated interactions in the physical and biological processes of the seafloor. Oceanographic parameters such as temperature, salinity, and ocean current can provide support for climate prediction. Therefore, the long-term observation of the deep seafloor is critical to the study of global climate change and the biodiversity in complex environments. For the requirements of long-term observation and remote data transmission in the deep sea of the South China Sea, a seafloor observation prototype system is designed in this paper as a stand-alone observation platform. We then proposed a date management method based on Controller Area Network to ensure the data quality. Distributed data management can be performed through system layering, and strict data transmission standards are established between each layer. At the same time, aiming at the difficulty of seafloor video data transmission in real-time, a new solution based on satellite communication technology, object detection technology, and high-efficiency compression coding technology of video images is proposed to provide support for seafloor biodiversity research. The observation data from the experiment are given, and these results show that the system can meet the requirements of long-term observation and remote real-time data transmission, and the reliability of the system is verified. 相似文献
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Sung Jin HONG Byung Ho CHOI Fumihiko IMAMURA 《中国海洋工程》2006,20(3):509-516
1 .Introduction In the present numerical analysis of a tsunami ,atwo-dimensional numerical model based on non-linear shallowwater theoryis mainly used (Aburaya and Imamura ,2002 ;Imamura ,1995 ; Goto andOgawa ,1992) .Thoughthis model representstsunami hei… 相似文献
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Features observed in horizontal wavenumber spectra from low-frequency acoustic measurements taken off the New Jersey Shelf are analyzed through forward modeling using PE models. Environmental models which produce very good agreement with relative intensity data may only match wavenumbers of lower order modes. A prominent feature in contours of modal amplitude versus horizontal wavenumber and depth is the presence of double images of some higher order modes. Two possible causes of this phenomenon are examined. Range dependence in the environment can produce multiple modal images, but the magnitudes of variations required are much larger than those expected at the experiment site. The more likely cause of the double modes is shown to be a duct deep (two acoustic wavelengths) within the sediment. It produces modes with wavenumbers that are close together and with shapes that are very similar in the water column. Comparisons of model predictions with 50-Hz experimental wavenumbers and mode shapes show good agreement, except for amplitudes of some higher order modes. Predictions at 75 Hz typically require more detailed information about the sediment structure in order to accurately match all the features of higher order modes in the data 相似文献
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