共查询到20条相似文献，搜索用时 109 毫秒
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为了解决导航电子地图数据生产成本高昂、更新周期长等问题,提出了由导航变化数据发现、分析、采集、制作、发布构成的导航电子地图增量式更新闭环服务模式,将公众和导航数据用户等非专业数据生产人员纳入到导航电子地图数据维护和更新框架,可以提高数据的现势性,而且大大地降低生产和应用成本,为导航电子地图服务提供了一种可操作性强的参考模式。 相似文献
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面向导航电子地图制作的多源地理空间数据融合技术 总被引：1，自引：1，他引：0
通过分析导航电子地图的制作,提出一种多源地理空间数据的融合技术。首先,针对导航电子地图数据3种基本要素类型的采集进行导航变化数据融合算法的设计,并在导航数据融合的同时维护导航数据的拓扑关系;然后,将融合后的导航电子地图数据与卫星影像数据进行叠加分析;最后,对不同数据变化分别制定相应的导航电子地图生产规划。 相似文献
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本文首先介绍了ArcGIS与"天地图·天水"的基本概念,以及框架数据生产、地图综合、影像数据处理、电子地图制作、瓦片制作等关键技术,详细阐述了"天地图"市级节点电子地图数据集生产的流程,为"天地图·天水"电子地图数据的数据维护、更新积累了经验。 相似文献
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就导航电子地图生产中基础数据库道路和POI信息点的采集与制作进行分析，探讨了全省导航电子地图的内业处理工作。 相似文献
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基于时空数据模型分析提出一种导航电子地图增量更新技术。首先根据传统的导航电子地图格式设计基本的导航电子地图的交换格式和分层分块的物理格式;然后使用增量包设计对实时导航信息的属性关系和空间关系进行增量存储,并根据导航电子地图增量更新服务框架设计了增量模式的数据编辑与检查;最后针对更新后的分块数据采用局部拓扑构建的方法,在编辑导航数据的同时维护导航数据的拓扑关系。增量更新技术平台的实现进一步验证了技术的实用性。 相似文献
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一种地形图快速扫描矢量化方法 总被引：5，自引：0，他引：5
提出了利用adobe的Steamline以及AutoCAD、CorelDraw对纸介图进行扫描矢量化的方法，该方法的主要功能是原图扫描、扫描图矢量化及矢量图校正的处理。经实践应用，其速度、精度等均可满足一般地理信息系统的要求。 相似文献
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GIScience scholars have identified map tours as an important visualization type for communicating spatial information: map tours are animations where the virtual camera moves through space and are common on the web, mobile devices, and television. Understanding how to enhance their effectiveness is timely because of recent, growing interest in virtual reality and animated map presentation tools such as Esri Story Maps? and Google Earth? tours. Despite this popularity, little empirical evidence exists about how people learn from map tours and how they should best be designed to improve effectiveness. This research is aimed at answering that need. An empirical study is described, which was designed to understand how virtual camera speed, path, and dynamic tilting within a map tour influence subjects’ ability to develop survey knowledge. The results of the experiment show that paths encompassing overviews of the landscape improve the viewer’s ability to build up survey knowledge; that tilting appears to have a much weaker effect; and that combining fast speed and a difficult path within a map tour increases the viewer’s cognitive load. 相似文献
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RobertP.Biuk-Aghai 《地球空间信息科学学报》2004,7(1):50-57
GIS applications to mobile devices are becoming increasingly popular, utilizing a di-verserange of devices. Many of these devices suffer from serious constraints in three main areas: processor speed, memory space and screen size. This paper presents a (;IS application, called “MacauMap“. that is intended for heavily resource-constrained handheld devices. MacauMap is a tourism oriented map application of the Macau territory for PalmOS and Pocket PC personal digital assistants. It was designed to perform satisfactorily on devices with as little as 16 MHz processor speed, and requires only 500 KB available memory for the GIS application and all GIS data. Memory requirements are kept low through a specially designed data format. The main challenge of satisfactory map drawing speed is addressed through a variety of techniques that were developed for this application. The paper describes the application‘s data format, outlines the map drawing techniques, and points out the areas for future development. 相似文献
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针对WebGIS多尺寸三维景观地图数据处理问题,提出了一种高速数据索引结构MSORQ-Tree。根据该索引的算法,得出移动WebGIS景观图,将该索引和其他索引进行性能比较。结果显示,基于金字塔分割规则的区域,进行分割四叉树所获取的MSORQ-Tree高速索引可有效处理WebGIS中海量景观地图数据。 相似文献
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