共查询到19条相似文献，搜索用时 500 毫秒
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目前,利用互联网发布和获取航海通告已经成为一种常态化模式,而海图生产部门和用户主要延用了手工选择、摘录、检查和入库等操作来处理和应用通告信息,这种方式制约了海图改正和更新工作的效率。以海图人工地物要素为主要研究对象,基于ArcMap软件、ArcGIS Add-In组件和ArcPython编程语言等开发环境,设计了互联网在线式人工地物信息处理解决方案,研究并解决了有关人工地物通告数据的爬取及清洗、提取与修编、检索和筛选,以及图层创建和输出等关键技术问题。实验结果表明:嵌入式软件成果能够极大提高海图人工地物信息的获取与处理效率,为海图改正和更新工作提供多种数据服务支持。 相似文献
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含水上升规律研究是油田动态分析的重要内容,应用Logistic生长曲线统一表征油田含水上升规律,并建立了涠洲油田群不同主力产层的油田含水上升模式。研究表明以涠洲组为主力产层的油田在生产过程中具有凸型的含水率上升规律,以角尾组为主力产层的油田在生产过程中具有s型的含水率上升规律,而以流沙港组为主力产层的油田在生产过程中则具有凹型的含水率上升规律。应用涠洲油田不同主力产层典型的含水率上升方程,结合区域产量规划研究,预测了涠洲油田群的产水量情况,为油田群水处理设施的建设规划提供了基础。研究方法对油田开发管理及区域规划具有一定的借鉴意义。 相似文献
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目前,我国的海图生产已经实现了由传统的手工模拟制作方式到计算机辅助数字化制作方式的历史性转变,可以按不同标准为用户提供各种数字海图数据和纸质海图产品,初步形成了基于海图数据库的数字海图和纸质海图生产新模式。然而,在这一新的海图生产模式中,如何实现对多样、异构的海图数据的一体化有效更新,却是一个一直未能得到很好解决的十分棘手的问题。为了有效解决这一问题,从分析我国现行的海图生产模式及特点入手,结合国内外相关研究成果对海图更新问题进行了深入的研究,初步给出了适合我国的海图产品一体化更新模式,并扼要分析了相关关键技术。 相似文献
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A new method of assimilating sea surface height (SSH) data into ocean models is introduced and tested. Many features observable by satellite altimetry are approximated by the first baroclinic mode over much of the ocean, especially in the lower (but non-equatorial) and mid latitude regions. Based on this dynamical trait, a reduced-dynamics adjoint technique is developed and implemented with a three-dimensional model using vertical normal mode decomposition. To reduce the complexity of the variational data assimilation problem, the adjoint equations are based on a one-active-layer reduced-gravity model, which approximates the first baroclinic mode, as opposed to the full three-dimensional model equations. The reduced dimensionality of the adjoint model leads to lower computational cost than a traditional variational data assimilation algorithm. The technique is applicable to regions of the ocean where the SSH variability is dominated by the first baroclinic mode. The adjustment of the first baroclinic mode model fields dynamically transfers the SSH information to the deep ocean layers. The technique is developed in a modular fashion that can be readily implemented with many three-dimensional ocean models. For this study, the method is tested with the Navy Coastal Ocean Model (NCOM) configured to simulate the Gulf of Mexico. 相似文献
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Pan-Mook Lee Seok-Won Hong Yong-Kon Lim Chong-Moo Lee Bong-Hwan Jeon Jong-Won Park 《Oceanic Engineering, IEEE Journal of》1999,24(3):388-395
This paper presents a discrete-time quasi-sliding mode controller for an autonomous underwater vehicle (AUV) in the presence of parameter uncertainties and a long sampling interval. The AUV, named VORAM, is used as a model for the verification of the proposed control algorithm. Simulations of depth control and contouring control are performed for a numerical model of the AUV with full nonlinear equations of motion to verify the effectiveness of the proposed control schemes when the vehicle has a long sampling interval. By using the discrete-time quasi-sliding mode control law, experiments on depth control of the AUV are performed in a towing tank. The controller makes the system stable in the presence of system uncertainties and even external disturbances without any observer nor any predictor producing high rate estimates of vehicle states. As the sampling interval becomes large, the effectiveness of the proposed control law is more prominent when compared with the conventional sliding mode controller 相似文献