Karst database development in Minnesota: design and data assembly

The Karst Feature Database (KFD) of Minnesota is a relational GIS-based Database Management System (DBMS). Previous karst feature datasets used inconsistent attributes to describe karst features in different areas of Minnesota. Existing metadata were modified and standardized to represent a comprehensive metadata for all the karst features in Minnesota. Microsoft Access 2000 and ArcView 3.2 were used to develop this working database. Existing county and sub-county karst feature datasets have been assembled into the KFD, which is capable of visualizing and analyzing the entire data set. By November 17 2002, 11,682 karst features were stored in the KFD of Minnesota. Data tables are stored in a Microsoft Access 2000 DBMS and linked to corresponding ArcView applications. The current KFD of Minnesota has been moved from a Windows NT server to a Windows 2000 Citrix server accessible to researchers and planners through networked interfaces.     

大流域3维水情信息系统的设计与实现研究

阐述了天津海河流域3维可视化应用系统的建设背景,系统设计及使用的关键技术。海河流域3维可视化应用系统（HH-VRGIS）是海河流域水利信息化的重要组成部分,它充分运用了现代GIS技术,先进的3维虚拟仿真可视化技术,大型数据库管理技术以及通信技术对水文专题信息的空间分析模型与查询技术进行了全面的整合,对海河流域的信息化管理,水资源的科学化调度和汛情及时准确的模拟和仿真做了基础研究。实践表明,该系统设计先进,界面友好,功能完善,运行稳定,具有较好的应用前景。     

Design of environmental decision support system and its application to water quality management

1 IntroductionEnvironmental decision support systems could be divided into two categories by their organizational form and system functions. One is regional environmental analytical system based on commercial GIS and assisted by environmental models, such as BASINS developed by the American NEPA using ARC/VIEW as its user platform and including QUAL2E and NPSM as its prediction tools. The other is environmental information and prediction system based on mathematical models, such as…     

人造卫星数据库管理系统中ORACLE FORMS的应用

ＯＲＡＣＬＥ ＦＯＲＭＳ是ＯＲＡＣＬＥ数据库系统应用程序重要的开发工具之一,它具有良好的窗口,模拟块以及触发器等功能,同时它作为ＯＲＡＣＬＥ大家族中的一员,与ＯＲＡＣＬＥ的其他应用工具又是分不开的。本文结合实例详细地介绍了ＯＲＡＣＬＥ ＦＯＲＭＳ在开发人造卫星数据库管理系统中的应用。     

ArcSDE压缩二进制存储格式的研究与改进

ArcSDE压缩二进制是ArcSDE在关系型数据库(RDBMS)中保存地理信息中二进制几何图形的存储格式,这种格式采用将浮点几何数据整形化的方法进行数据压缩,减少了数据存储空间,同时也加快了数据在网络上传输的速度。本文通过对ArcSDE压缩二进制存储格式的研究与分析,指出了这种格式在存取和处理效率上的不足之处,并提出了更为高效的改进方法。     

Web中集成PB应用软件技术解决方案

以武汉市供电局Web数据库应用解决方案为例 ,分析应用需求 ,根据武汉市供电局的特点和网络特点 ,分解Web应用为两方面 :①企业内部的Web应用实现 ;②企业外部信息在Web上发布。并针对在不同的环境、条件下 ,如何在Web中集成PB应用 ,减少开发 ,保证现有系统的性能 ,从而实现以Web数据库为特征的、建立在Internet/Intranet基础上的现代信息管理系统。     

环境决策支持系统的设计及其在水质管理中的应用

ＥＤＳＳ（Ｅｎｖｉｒｏｎｍｅｎｔａｌ Ｄｅｃｉｓｉｏｎ Ｓｕｐｐｏｒｔ Ｓｙｓｔｅｍ）是一处适用于潮汐河网地区水环境管理和决策的软件系统,其主要功能是协助政府部门进行有效和科学的水环境管理。该系统采用地理信息系统、数据管理系统、模型库管理系统和专家系统等先进技术,将环境数据库、水动力与水质模型库、经济优化技术、环境专家以及环境法规有机地集成在一起。文中首先介绍了ＥＤＳＳ的组织方法、设计特征、实现技     

基于VB开发测量应用程序的几点体会

本文对Visual Basic5.0在测量软件编程方面的应用进行了探讨，并结合作者的实践，详细讲述了用VB实现全站仪与微机的数据通讯，DLL的建立与调用、数据库管理系统（DBMS）的接口设计、建立、数据格式的转换等方面的方法和技巧。     

3-D Geovisualization of satellite images on smart devices by the integration of spatial DBMS,RESTful API and WebGL

Recent technological advancements in web-based geographic information systems have enabled access to satellite images on smart devices. The Representational State Transfer (REST) architecture overcomes difficulties that are associated with conventional data communications on the web, and the Web Graphics Library (WebGL) can be used as an alternative to web-based three-dimensional geographic visualization (3-D geovisualization) due to its efficient image processing capabilities. This paper describes a 3-D geovisualization system that was developed for satellite images on smart devices by integrating a spatial database management system (DBMS), a RESTful application programming interface (API), and WebGL. Spatiotemporal objects were constructed for time-series satellite images within a DBMS and a RESTful API was built for spatiotemporal queries to the time-series database so that the requested satellite data could be represented in 3-D on smart devices using WebGL. Satellite images that are represented in WebGL give a more realistic 3-D experience when they are combined with terrain data and provide for intuitive observations of the relationships between pixel values and associated geospatial conditions. This paper shows that a creative combination of existing technologies can be used to enhance and display satellite images on smart devices for 3-D geovisualization.