共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
此文综合考虑了影响海图信息显示精度的主要误差源,对电子海图的显示精度进行分析和估算,并指出提高精度的方法和途径。 相似文献
3.
4.
标准化电子海图数据库若干问题的研究 总被引:2,自引:0,他引:2
胡勤友 《上海海运学院学报》1999,20(3):78-84
在深入研究IHOS-57V3.0“数字海图测量数据转换标准”的基础上,探讨了 电子海图数据库原理,标准电子海图数据库与非标准电子海图数据库之间的转换以及标准电子海图数据库建立规程等问题。 相似文献
5.
《舰船科学技术》2020,(4)
现有的雷达模拟视频与电子海图实时叠加匹配算法,存在匹配精度差的缺陷。为了解决上述问题,提出雷达模拟视频与电子海图实时叠加匹配算法。将雷达模拟视频与电子海图坐标转换为屏幕显示坐标,以此为基础,利用视频控制器TMS BT 458/9叠加雷达模拟视频与电子海图,以叠加后图像为基础,依据匹配模型匹配雷达模拟视频与电子海图的比例尺,实现了雷达模拟视频与电子海图的实时叠加匹配。实验结果显示,与现有的雷达模拟视频与电子海图实时叠加匹配算法相比,提出的雷达模拟视频与电子海图实时叠加匹配算法极大提升了匹配精度,充分说明提出的雷达模拟视频与电子海图实时叠加匹配算法具备更好的叠加匹配性能。 相似文献
6.
文章介绍了根据专题电子海图制作的要求和现状,利用AutoCAD的二次开发插件的数据转换功能,准确快速地转换数据,从而提高专题电子海图的制作效率。 相似文献
7.
电子海图上距离和真方位的计算精度 总被引:1,自引:0,他引:1
本文论述了计算电子海图上任意两点间的实地距离(大圆弧距离)和真方位的方法,给出了电子海图上点状物标的地理坐标的获取算法,对电子海图数据库中物标的地理坐标进行了误差估计,运用数学分析方法对距离和真方位的计算精度进行了估算。 相似文献
8.
9.
10.
为了提高海上目标的匹配定位,提出雷达模拟视频与电子海图叠加匹配算法。根据雷达和电子海图的显示特点,通过对采集的雷达模拟视频信号执行数字化、坐标转换和图像转换等操作,实现雷达和电子海图的叠加。分别提取叠加效果图像中的特征点,并计算特征点之间的相似度,从而实现对雷达模拟视频与电子海图的叠加匹配。经过与传统匹配算法的对比,发现设计叠加匹配算法的平均匹配率提高了11.2%。 相似文献
11.
HAOYan-ling LUHui WANGAi-wen 《船舶与海洋工程学报》2004,3(1):28-32
Three-dimension electronic chart display information system (ECDIS) is one of the new developing directions of electronic navigation chart, and its real-time quality is one of the important requirements. In this paper the algorithm of simplifying triangle surface using edge contraction, which can ensure the real-time display of objects in seabed environment, was put forward. The optimum contraction point was determined by the Lagrange matrix, so that the algorithm ensures that the contraction point locates on the original model, meanwhile meets the demands of least deviation. This algorithm can improve the plotting speed, and preserve the boundary character by using the fewer triangles to simulate objects. 相似文献
12.
中国海事航海图书资料发行网站(www.chart.gov.cn),作为向国内航运业免费提供官方沿海电子海图、内河水域的电子航行示意图以及电子海图更新信息的服务平台,网站的可用性至关重要,文章从网站运维管理的角度,讲述了如何选择合适的手段,防范和抵御各种风险,确保网站的正常运行。 相似文献
13.
航海图书是船舶海上航行安全的重要保障资料。随着航海业的发展以及海洋活动的增加,航海图书的服务所处的地位越发重要。英、美等国家所采用的航海图书服务管理机制效率较高,代表了当今国际流行的趋势。介绍并分析了英、美等国家航海图书服务的特点,得出对我国航海图书服务的启示。 相似文献
14.
航海模拟器已经广泛应用于港航设计论证中,针对模拟论证对电子海图数据的使用要求,分析了电子海图数据的来源和途径,特别介绍了IHO(International Hydrographic Organization,国际海道组织)S-57、MVCF(Military Vector Chart Format,军用矢量数据)和CAD(Computer Aided Design,计算机辅助设计)等格式数据.提出了一套科学合理的电子海图数据生成方法,特别是设计了合理的ENC(Electronic Nautical Chart)数据结构和多种海图数据来源的转换流程,研究了光栅图片的数字化技术,以及多幅海图的融合方法.经过一百多个港航设计论证项目实践证明,应用效果良好. 相似文献
15.
从平面地图数学建模、曲线平滑处理、现代航海数据采集、数据库工程及计算机可视化编程等诸多方面入手,在当前AIS与VDR强制安装带来的现代航海数据采集多渠道化、自动化的背景下,就电子海图中对航海动静态数据的显示方法做了初步的探索。 相似文献
16.
本文针对已抽取海岸边缘特征并二值化的电子海图和已进行任意实数倍缩小变换至海图比累积误差代替门限序列的粗精搜索间隔采样快速实时匹配。通过计算机仿真,证明该算法简便易行、精度较高、实时性好。 相似文献
17.
Maritime management encompasses the employment and manipulation of human resources, financial resources, technological resources and natural resources that relate to the sea, maritime navigation, shipping, port development and coastal protection. It contributes to the economic growth, price stability, transportation of cargoes and passengers, and business activities of shipping organizations. The efficient management of resources, operations and activities relies on a modern marine information system (MIS) whose information is provided by geomatics engineers and IT professionals, among others. This paper first introduces the role of the geomatics engineer as geodesist, engineering surveyor, land boundary surveyor, cartographer, hydrographer, photogrammetrist and geographic information system (GIS) engineer since all these fields are related to maritime trade, supply chains and development of ports and airports. It then describes the principal components of a web-based MIS and the important role of geomatics engineers in surveying data. This includes collecting data from electronic nautical charts (ENC) and raster nautical charts (RNC), by applying high resolution light detection and ranging (LIDAR), satellite platform sensors and GIS. 相似文献
18.
Steve Yau-Wah Lam 《Maritime Policy and Management》2013,40(1):53-60
Maritime management encompasses the employment and manipulation of human resources, financial resources, technological resources and natural resources that relate to the sea, maritime navigation, shipping, port development and coastal protection. It contributes to the economic growth, price stability, transportation of cargoes and passengers, and business activities of shipping organizations. The efficient management of resources, operations and activities relies on a modern marine information system (MIS) whose information is provided by geomatics engineers and IT professionals, among others. This paper first introduces the role of the geomatics engineer as geodesist, engineering surveyor, land boundary surveyor, cartographer, hydrographer, photogrammetrist and geographic information system (GIS) engineer since all these fields are related to maritime trade, supply chains and development of ports and airports. It then describes the principal components of a web-based MIS and the important role of geomatics engineers in surveying data. This includes collecting data from electronic nautical charts (ENC) and raster nautical charts (RNC), by applying high resolution light detection and ranging (LIDAR), satellite platform sensors and GIS. 相似文献
19.