共查询到20条相似文献,搜索用时 15 毫秒
1.
Nowadays, more and more digitalized spatial data are sold and transmitted on the Internet. Thus, there arises an important issue about copyright protection of the digital data. To solve this problem, this paper has designed and implemented a spatial data watermarking service (SDWS) system which can provide a secure framework for data transaction and transfer via the Internet and protect the rights of both copyright owners and consumers at the same time. 相似文献
2.
3.
4.
5.
根据灰度图像信息量大、可视化效果好等特点,提出一种基于灰度图像水印的空间域矢量地理空间数据水印算法,即先将灰度图像水印信息按一定法则进行处理,再将处理后的水印信息嵌入到空间域矢量地理空间数据中,最后对嵌入水印信息的矢量地理空间数据进行检测。文中还对矢量地理空间数据进行了攻击实验,分析表明,提取出的灰度图像水印具有较好的鲁棒性效果和一定的实用价值。 相似文献
6.
基于移动GIS的公共设施巡查系统的设计与实现 总被引:1,自引:0,他引:1
本文使用ArcGIS Server Mobile SDK开发了用于移动端的公共设施巡查系统.文章在系统分析设计的基础上重点阐述系统的功能的实现,利用ArcGIS Mobile提供的组件和类库,通过C.NET编程开发并实现了系统的各个功能.在实例的分析中使用沈阳市部分公共设施数据进行了验证,结果系统稳定,功能基本完善,数... 相似文献
7.
8.
9.
《International Journal of Digital Earth》2013,6(9):901-922
ABSTRACTSpatial online analytical processing (OLAP) and spatial data warehouse (SDW) systems are geo-business intelligence technologies that enable the analysis of huge volumes of geographic data. In the last decade, the conceptual design and implementation of SDWs that integrate spatial data, which are represented using the vector model, have been extensively investigated. However, the integration of field data (a continuous representation of spatial data) in SDWs is a recent unresolved research issue. Enhancing SDWs with field data improves the spatio-multidimensional analysis capabilities with continuity and multiresolutions. Motivated by the need for a conceptual design tool and relational online analytical processing (ROLAP) implementation, we propose a UML profile for SDWs that integrates a regular grid of points and supports continuity and multiresolutions. We also propose an efficient implementation of a ROLAP architecture. 相似文献
10.
11.
In this paper,two cases of data consistency problems are discussed in Multi-user Geographical Information System.When a user updates some spatial data that have been accessed by other users in database,or executes an UNDO/REDO operation,data consistency will probably be destroyed.To solve the problem caused by the first case,a "Notification-Reread Method" is introduced.As for the second case,there are many problems to be studied. 相似文献
12.
In this paper, two cases of data consistency problems are discussed in Multi-user Geographical Information System. When a user updates some spatial data that have been accessed by other users in database, or executes an UNDO/REDO operation, data consistency will probably be destroyed. To solve the problem caused by the first case, a “Notification-Reread Method” is introduced. As for the second case, there are many problems to be studied. 相似文献
13.
14.
基于Web服务和GML的空间数据发布 总被引:4,自引:0,他引:4
针对当前信息共享存在的问题,提出Web服务和GML解决问题的思路,并讨论在基于Web服务和GML的空间数据发布中采用的关键技术。 相似文献
15.
16.
传统的土地用途分区方法存在受人为因素影响、效率低下的问题,不利于土地用途分区管制的实施,基于GIS的智能化的土地用途分区系统则可以弥补这一缺陷。本文以GIS相关理论和土地用途分区的需求分析为基础,构建了系统的逻辑框架,研究了数据库、模型库、算法库和知识库的设计方案,提出了土地用途分区过程中的空间数据整合、目标函数和分区模型的选择等问题的解决方案,并实现了面向土地用途分区的空间聚类系统。以典型地区的土地用途分区为例,验证了该空间聚类系统是一种智能、高效、科学的土地用途分区平台。 相似文献
17.
18.
19.