基于CorelDRAW X6的专题地图统计图表自动化实现

凭借卓越的图形、文字编辑功能,CorelDRAW颇受制图人员的青睐,尤其在专题地图的设计与编绘中扮演着重要角色。文中基于专题地图统计图表的快速准确绘制的需求,结合ActiveX Automation和ADO数据库访问技术,利用Visual Basic语言在CorelDRAW X6中进行二次开发,实现多种常用统计图表的自动化生成,为今后各类专题地图的内容表达提供借鉴与参考。     

Classification of dual- and single polarized SAR images by incorporating visual features

Fully and partially polarimetric SAR data in combination with textural features have been used extensively for terrain classification. However, there is another type of visual feature that has so far been neglected from polarimetric SAR classification: Color. It is a common practice to visualize polarimetric SAR data by color coding methods and thus it is possible to extract powerful color features from such pseudo color images so as to gather additional crucial information for an improved terrain classification. In this paper, we investigate the application of several individual visual features over different pseudo color generated images along with the traditional SAR and texture features for a novel supervised classification application of dual- and single-polarized SAR data. We then draw the focus on evaluating the effects of the applied pseudo coloring methods on the classification performance. An extensive set of experiments show that individual visual features or their combination with traditional SAR features introduce a new level of discrimination and provide noteworthy improvement of classification accuracies within the application of land use and land cover classification for dual- and single-pol image data.     

基于多尺度DTM的坡式梯田三维可视化研究

针对黄土高原梯田可视化问题,以往的相关研究基本解决了水平梯田的三维可视化,但关于坡式梯田的研究尚为空白。坡式梯田因其具备更加突出的人工微地形特性,难以通过传统的DEM可视化方法实现其三维可视化。该文提出了多尺度DTM叠加法,利用偏移线法、高程增量法等方法提取田埂坡度特征,将研究区的低分辨率格网DEM(G-DEM)、坡式梯田分布区的高分辨率坡度DTM及G-DEM融合为一体,对坡式梯田进行三维叠加可视化。与传统G-DEM可视化方法相比,多尺度DTM叠加可视化法不仅所需数据存储量更小,而且具备更加逼真的坡式梯田三维可视化效果,能够有效显示坡式梯田的平坦田面和陡直田埂,是对基于DEM的梯田地形三维可视化的有益探索。     

地质花纹的生成及应用

针对CorelDRAW、Surfer和Grapher等软件在地质花纹设计方面的空缺,在构图上总结分析了地质花纹分布规律,提出利用Visual Basic 2010控制CorelDRAW X4软件自动化制作方法;填充时可根据图面,调整花纹的大小、疏密度、颜色等,生成的花纹可应用于CorelDRAW、Surfer、Grapher等软件。     

用VB2008和Excel2007开发软弱下卧层强度验算程序

使用Visual Basic 2008的ActiveX技术引用Excel 2007,实现了软弱下卧层强度自动验算程序,能够满足工程验算要求,应用效果良好。     

Landslides triggered by the 22 July 2013 Minxian–Zhangxian,China, Mw 5.9 earthquake: Inventory compiling and spatial distribution analysis

On July 22, 2013, an earthquake of Ms. 6.6 occurred at the junction area of Minxian and Zhangxian counties, Gansu Province, China. This earthquake triggered many landslides of various types, dominated by small-scale soil falls, slides, and topples on loess scarps. There were also a few deep-seated landslides, large-scale soil avalanches, and fissure-developing slopes. In this paper, an inventory of landslides triggered by this event is prepared based on field investigations and visual interpretation of high-resolution satellite images. The spatial distribution of the landslides is then analyzed. The inventory indicates that at least 2330 landslides were triggered by the earthquake. A correlation statistics of the landslides with topographic, geologic, and earthquake factors is performed based on the GIS platform. The results show that the largest number of landslides and the highest landslide density are at 2400 m–2600 m of absolute elevation, and 200 m–300 m of relative elevation, respectively. The landslide density does not always increase with slope gradient as previously suggested. The slopes most prone to landslides are in S, SW, W, and NW directions. Concave slopes register higher landslide density and larger number of landslides than convex slopes. The largest number of landslides occurs on topographic position with middle slopes, whereas the highest landslide density corresponds to valleys and lower slopes. The underlying bedrocks consisting of conglomerate and sandstone of Lower Paleogene (E^b) register both the largest number and area of landslides and the highest landslide number and area density values. Correlations of landslide number and landslide density with perpendicular- and along-strike distance from the epicenter show an obvious spatial intensifying character of the co-seismic landslides. The spatial pattern of the co-seismic landslides is strongly controlled by a branch of the Lintan-Dangchang fault, which indicates the effect of seismogenic fault on co-seismic landslides. In addition, the area affected by landslides related to the earthquake is compared to the relationship of “area affected by landslides vs. earthquake magnitude” constructed based on earthquakes worldwide, and it is shown that the area affected by landslides triggered by the Minxian–Zhangxian earthquake is larger than that of almost all other events with similar magnitudes.     

Seeing the forest and the trees: Facilitating participatory network planning in environmental governance

Governance processes to address environmental change involve many different actors from multiple spatial, temporal and socio-political scales, not all of whom are connected by hierarchy and whose actions cannot always be mandated. In the environmental governance literature, Social Network Analysis (SNA) has been found useful in understanding complex governance arrangements. In this paper we present and reflect on our experience with the Net-Map tool for participatory network mapping. The Net-Map tool was applied in three transdisciplinary case studies for three different purposes: (a) to contribute to an improved understanding of biodiversity knowledge flows in Europe, (b) to explore the interplay between actors with influence on water, agriculture, and energy developments at the Blue Nile in Ethiopia, and (c) to understand the challenges facing stakeholders engaged in conservation and economic development in a Southeast Asian mountain range. The case studies explore how network maps can serve as boundary objects to engage stakeholders of diverse points of view and jointly design strategies to address governance challenges. More specifically they show how network maps are used to gain a better understanding of governance situations, to help stakeholders identify strategies for navigation of the complex networks in which they are embedded and to support transdisciplinary research processes. We close with some reflections on the potential and limitations of the Net-Map tool in facilitating multi-stakeholder processes and disentangling complex governance arrangements.     

混合编程技术在台风资料图形化分析中的应用

详细论述了Visual Basic和Visual Fortran混合编程的两种技术方法:Visual Basic直接调用Visual Fortan预编译生成的可执行文件以及基于Win32动态链接库(DLL)进行参数传递.并利用台风资料图形化分析实例对开发的具体步骤进行阐述,为解决数值计算和图形操作界面开发的技术难题提供有效的方法.     

应用Visual FoxPro编制化探点位数据图

基于Visual FoxPro5．0可视化数据库管理系统,编制《化探点位数据图工具》软件,实现化探非规则测网的计算机自动提取点位的横坐标、纵坐标,点位号的横坐标、纵坐标;自动制作点位图、元素数据图、规则测网自动制作点位图、元素数据图等功能。程序界面友好、使用方便。     

岩土工程监测信息管理与数据分析网络系统开发及应用

针对目前水电边坡工程海量的监测信息和监测数据,为减轻监测信息管理与数据分析的劳动强度,提高劳动生产率,采用Microsoft Visual C++网络编程技术和SQL Server网络数据库开发出具有先进性、可靠性、通用性和可扩充性的岩土工程安全监测信息管理与数据分析远程可视化网络系统。将该系统应用于龙滩水电站大坝左、右岸边坡及导流洞监测资料的分析处理,实现了监测信息和数据的远程实时共享及网络化的管理和分析,使监测分析成果能够及时、准确地反馈给设计人员,对规避设计和施工风险、保证边坡施工和运行安全起到了重要的作用。