VB.NET中用ASPMAP控件开发Web地图显示程序

地图的显示和基于地图的操作是地理信息系统（GIS）开发的基础,介绍一种基于ASPMAP控件开发Web地图显示程序,具有简单、方便、实用和功能强大的特点。     

Integrating scientific modeling and supporting dynamic hazard management with a GeoAgent-based representation of human–environment interactions: A drought example in Central Pennsylvania, USA

Recent natural disasters indicate that modern technologies for environmental monitoring, modeling, and forecasting are not well integrated with cross-level social responses in many hazard-management systems. This research addresses this problem through a Java-based multi-agent prototype system, GeoAgent-based Knowledge System (GeoAgentKS). This system allows: (1) computer representation of institutional regulations and behavioral rules used by multiple social institutions and individuals in cross-level human–environment interactions, (2) integration of this representation with scientific modeling of dynamic hazard development, and (3) application of automated reasoning that suggests to users the appropriate actions for supporting cooperative social responses. This paper demonstrates the software architecture of GeoAgentKS and presents such an integrated approach by modeling the drought management processes in Central Pennsylvania, USA. The results show that it is possible to use GeoAgentKS to represent multilevel human–environment interactions and to use those interactions as input to decision making in hazard management.     

Suitability evaluation of urban construction land based on geo-environmental factors of Hangzhou, China

Suitability evaluation of urban construction land based on geo-environmental factors is the process of determining the fitness of a given tract of land for construction. This process involves a consideration of the geomorphology, geology, engineering geology, geological hazards, and other geological factors and is the basis of urban construction land planning and management. With the support of Geographic Information Systems (GIS), grid analysis, and geo-spatial analysis techniques, four factor groups comprising nine separate subfactors of geo-environmental attributes were selected to be used in the evaluation of the suitability level for construction land in Hangzhou. This was based on K-means clustering and back-propagation (BP) neural network methods due to their advantages in fast computing, unique adaptive capacity, and self-organization. Simultaneously, the evaluation results based on K-means clustering and BP neural network were compared and analyzed, and the accuracy evaluation was set. The results showed that the geo-environmental suitability evaluation results of construction land based on K-means clustering and BP neural network were similar in terms of the distribution and scale of construction land suitability level. At the same time, the results of the two evaluation methods were consistent with the variability in suitability level, engineering geology, and hydrogeology of Hangzhou. The results also showed that the real advantage of the methods proposed in this paper lies in their capacity to streamline the mapping process and to ensure that the results are consistent throughout. The suitability level of the urban construction land based on the geo-environment in Hangzhou was divided into four construction sites: land for building super high-rise and high-rise buildings, land for building multistorey buildings, land for low-rise buildings, and nonbuilding land. The results of the suitability evaluation for each category will provide a scientific basis for decision-making in urban development in Hangzhou.     

智慧城市之危险源远程监控解决方案

随着城市化建设的不断发展,一些有毒、有害、易燃、易爆等危险源有明显向城市整体区域扩散的趋势,因此为了城市的安全,必须把城市重大危险源的控制与管理提到重要位置。针对智慧城市建设中的危险源远程监控系统,本文提出了详尽的解决方案,并且介绍了力控科技产品在此系统中的应用。     

闽江口湿地遥感影像最佳景观观察尺度的选择

应用遥感和地理信息系统技术,对景观最佳观察尺度选择的方法进行了探讨;构建了“定量化景观指数粒度敏感区间,定性化尺度大小,定性与定量相结合决定最佳观察尺度值“的最佳景观观察尺度选择模式,并以ASTER遥感影像为数据源,应用该模式对闽江口湿地景观最佳观察尺度进行了研究,指出闽江口湿地的景观观察尺度应以50m和100m为主,最大尺度不应超过200m.     

Probe into Key Techniques of Regional-Oriented 3D GIS On the key techniques of 3D GIS used for regional Geological Information System

Regional Geological Information System combines the multi-dimensional and dynamic spatial information into an integrated spatial information system. 3D geological modeling and its preprocessing or post-processing are the most difficult problems for constructing the system. Based on the current 3D GIS technique, some basic problems in establishing the system are discussed in this paper, including 3D spatial data model, 3D geological modeling, and visualization of 3D geological data. A kind of 3D vector data model based on boundary representation for geological object and its topology was developed in order to model and visualize complex geological structures. In addition, some key techniques are pointed out for further study.     

基于MapObjects的流域GIS系统开发及应用

以Microsoft Visual Basic为软件平台，应用ESRI公司提供的COM对象库——MapObjects，结合“数字清江”项目中清江流域地理信息系统的研制，阐述在MapObjects下COMGIS的二次开发方式及实现过程。     

GIS线状缓冲区生成算法研究

缓冲区分析是地理信息系统重要的空间分析功能之一．地理信息系统中的缓冲区生成分点、线、面3种,线状目标缓冲区的生成是点、线、面3种基本空间要素缓冲区生成的关键和基础,文中就线状目标缓冲区的两种生成算法进行了严密的数学推导,并通过编程实现取得了较好的效果．     

Dwg文件转入MapInfo系统的方法

本文针对GIS系统建设过程中需要解决的基础地理数据转入Maplnfo系统的方法问题进行阐述,以供业界各位同行探讨。