而1：5万地形图在地形图系列中现势性最差，出版年代较早。
The publish years of 1:50000 topographic map is more early comparing with the other topographic map series.
为了保持用户数据库现势性，需将数据库更新过程中产生的增量信息及时发布给用户。
For keeping reality of user's database, the incremental information created by updating need to be given to users in time.
导航电子地图作为导航系统的重要基础，数据的现势性如何直接影响到导航的准确与否。
Digital navigation map is fundamental part for VNS, so map data actuality will directly exert an influence on navigation accuracy.
这样不仅可以快速更新境界要素的各种数据，而且提高了基础地理信息的现势性和利用价值。
Not only are boundary elements renewed rapidly, but also the present situation and utilized values of fundamental geo-information are promoted.
为满足城市建设对于地形图现势性方面的需求，杭州市基础测绘管理实行了动态跟踪修测方法。
The Hangzhou basic mapping management department takes the dynamic following up on mapping method into action in order to adapt to the new situation.
增量更新由于其方式灵活而且能够更好地保证空间数据的现势性，是未来数据库更新的主要趋势。
Incremental updating will be next major trends of the database because of its flexibility and better way to ensure the real time of spatial data.
高质量、强现势性的城市空间数据的获取、更新和使用问题已成为当前“数字广州”建设中的瓶颈。
Currently the gathering, update and usage of high quality and up-to-date urban spatial data have become the bottleneck in the construction of "Digital Guangzhou".
为在宁夏将遥感技术应用于土地祥查奠定了基础，也为土地调查统计提供了新的有效途径和方法，提高了效率和现势性。
This work lays foundation to apply RS technology in land investigation in Ningxia, and provides a new valid path and method, at the same time; it enhances the work efficiency and present situation.
它为整个城市提供各种现势性的空间数据信息源，为城市规划、建设、管理和服务提供统一的、标准的空间数据基础框架。
It offers all kinds of up-to-date spatial data sources for the whole urban, and it offers uniform and standard spatial data infrastructure for the layout building management and service of urban.
互联网在信息传播中扮演着越来越重要的角色，网页文本中蕴含着一些现势性很强的地理要素信息，可作为地理要素变化发现的数据源。
Internet has been more and more important for information dissemination. Web page contains latest geographic feature information and it can be used for change detection.
一是研究的属性问题，即理论研究和应用研究在资料利用方面的不同：理论研究要求数据资料的时间连续性和空间完整性，但对数据的现势性没有特别要求；
First, the attribute of studies, theoretical research is different from applied study: the former requires data to be continuous in time and entire in space, but the latter demand the data to be new.
实践证明此项技术作为获取项目前期基础信息的有效手段，作业周期短、成本经济且现势性好，其成果兼具客观性和直观性，可有效辅助项目后续工作的实施。
The practice shows that, for the project, as an effective method for acquisition fundamental information in early time, this technique has shortened the operation cycle, and has saved the cost.
对地图生产中的多源数据利用作了较为全面的研究，包括资料分类、数据获取方法和数据处理方法。把各种资料数据统一在一个应用平台上，保证了地图和空间数据的现势性；
Study application methods of the multi-sources data in map production, including sort of sources, data collection, and data processing, in order to updating the map and spatial data in one platform.
对地图生产中的多源数据利用作了较为全面的研究，包括资料分类、数据获取方法和数据处理方法。把各种资料数据统一在一个应用平台上，保证了地图和空间数据的现势性；
Study application methods of the multi-sources data in map production, including sort of sources, data collection, and data processing, in order to updating the map and spatial data in one platform.
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