基于影像和矢量数据的三调界线数据更新方法

针对第三次全国国土调查界线数据存在的拓扑不一致问题,基于影像和矢量数据,通过构建拓扑规则,对不同来源、不同时期的三调界线数据进行质量检查与更新,并针对更新中出现的11类特殊问题,分别给出了不同的处理方法。基于以上方法完成了第三次全国国土调查行政区域界线、零米线等矢量数据的更新工作。

ActionScript在大庆市电子地图开发中的应用研究

利用Flash软件环境下的ActionScript可以开发成熟的应用程序,它们既可以在Web浏览器中运行,也可以作为一个可执行程序独立运行。本文介绍了利用ActionScript语言简单、灵活、结构化、可维护的特点及Flash软件基于矢量、适合开发网络应用的特性来开发电子地图系统的应用研究。在本系统中,实现了大部分电子地图系统的功能,介绍了关键技术的实现。

High-resolution remote sensing image-based extensive deformation-induced landslide displacement field monitoring method

Landslide is one of the multitudinous serious geological hazards. The key to its control and reduction lies on dynamic monitoring and early warning. The article points out the insufficiency of traditional measuring means applied for large-scale landslide monitoring and proposes the method for extensive landslide displacement field monitoring using high- resolution remote images. Matching of cognominal points is realized by using the invariant features of SIFT algorithm in image translation, rotation, zooming, and affine transformation, and through recognition and comparison of characteristics of high-resolution images in different landsliding periods. Following that, landslide displacement vector field can be made known by measuring the distances and directions between cognominal points. As evidenced by field application of the method for landslide monitoring at West Open Mine in Fushun city of China, the method has the attraction of being able to make areal measurement through satellite observation and capable of obtaining at the same time the information of large- area intensive displacement field, for facilitating automatic delimitation of extent of landslide displacement vector field and sliding mass. This can serve as a basis for making analysis of laws governing occurrence of landslide and adoption of countermeasures.

Voronoi图生成的栅格算法

介绍了Ｖｏｒｏｎｏｉ图的矢量算法，从用于ＧＩＳ的角度分析了该方法存在的问题和不足，提出Ｖｏｒｏｎｏｉ图生成的栅格方法。分析了利用传统的距离变换生成栅格Ｖｏｒｏｎｏｉ图的误差情况，对各种栅格算法从精度方面进行了分析，并给出了空间实体Ｖｏｒｏｎｏｉ图的生成过程。