In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational meth...In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational methods have been supported in civil engineering, subsidence engineering and mining engineering practice. However, ground movement problem due to mining extraction sequence is effectively four dimensional （4D）. A rational prediction is getting more and more important for long-term underground mining planning. Hence, computer-based analytical methods that realistically simulate spatially distributed time-dependent ground movement process are needed for the reliable long-term underground mining planning to minimize the surface environmental damages. In this research, a new computational system is developed to simulate four-dimensional （4D） ground movement by combining a stochastic medium theory, Knothe time-delay model and geographic information system （GIS） technology. All the calculations are implemented by a computational program, in which the components of GIS are used to fulfill the spatial-temporal analysis model. In this paper a tight coupling strategy based on component object model of GIS technology is used to overcome the problems of complex three-dimensional extraction model and spatial data integration. Moreover, the implementation of computational of the interfaces of the developed tool is described. The GIS based developed tool is validated by two study cases. The developed computational tool and models are achieved within the GIS system so the effective and efficient calculation methodology can be obtained, so the simulation problems of 4D ground movement due to underground mining extraction sequence can be solved by implementation of the developed tool in GIS.展开更多
Based on Remote Sensing （RS）, Geographic Information System （GIS）, and combining Principal Component Analysis, this paper designed a numerical integrated evaluation model for mountain eco-environment on the base ...Based on Remote Sensing （RS）, Geographic Information System （GIS）, and combining Principal Component Analysis, this paper designed a numerical integrated evaluation model for mountain eco-environment on the base of grid scale. Using this model, we evaluated the mountain eco-environmental quality in a case study area-the upper reaches of Minjiang River, and achieved a good result, which accorded well with the real condition. The study indicates that, the integrated evaluation model is suitable for multi-layer spatial factor computation, effectively lowing man＇s subjective influence in the evaluation process; treating the whole river basin as a system, the model shows full respect to the circulation of material and energy, synthetically embodies the determining impact of such natural condition as water-heat and landform, as well as human interference in natural eco-system; the evaluation result not only clearly presents mountainous vertical distribution features of input factors, but also provides a scientific and reliable thought for quantitatively evaluating mountain eco-environment.展开更多
空间信息技术和网络技术融合，形成了一个基于Internet的WebGIS热门研究课题。分析了互联网信息时代的WebGIS的几种实现方案，比较了其优缺点；提出了在微软公司的Windows DNA（Distributed interNet Application）环境下的基于DCOM（Di...空间信息技术和网络技术融合，形成了一个基于Internet的WebGIS热门研究课题。分析了互联网信息时代的WebGIS的几种实现方案，比较了其优缺点；提出了在微软公司的Windows DNA（Distributed interNet Application）环境下的基于DCOM（Distributed Component Object Model）技术的3层结构的WebGIS的系统设计与实现方案。展开更多
当前配电网地理信息系统(geographical information system,GIS)与数据采集监控系统(supenvisory control and data acquisiton,SCADA)的集成策略存在着功能重复、数据描述及界面不统一等问题。通过对2系统的功能结构进行分析,引进组件...当前配电网地理信息系统(geographical information system,GIS)与数据采集监控系统(supenvisory control and data acquisiton,SCADA)的集成策略存在着功能重复、数据描述及界面不统一等问题。通过对2系统的功能结构进行分析,引进组件对象模型技术,对各个功能模块在底层开发平台上进行集成,避免了重复开发,还提供了开放的子接口以便进行灵活的二次开发。对集成系统数据库的结构进行了分析,利用ActiveX数据对象技术等对数据库进行统一管理,GIS与SCADA等子系统之间基于平台接口函数直接交换数据,实现了无缝连接,保证了数据的一致性和系统的实时性。展开更多
文摘In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational methods have been supported in civil engineering, subsidence engineering and mining engineering practice. However, ground movement problem due to mining extraction sequence is effectively four dimensional （4D）. A rational prediction is getting more and more important for long-term underground mining planning. Hence, computer-based analytical methods that realistically simulate spatially distributed time-dependent ground movement process are needed for the reliable long-term underground mining planning to minimize the surface environmental damages. In this research, a new computational system is developed to simulate four-dimensional （4D） ground movement by combining a stochastic medium theory, Knothe time-delay model and geographic information system （GIS） technology. All the calculations are implemented by a computational program, in which the components of GIS are used to fulfill the spatial-temporal analysis model. In this paper a tight coupling strategy based on component object model of GIS technology is used to overcome the problems of complex three-dimensional extraction model and spatial data integration. Moreover, the implementation of computational of the interfaces of the developed tool is described. The GIS based developed tool is validated by two study cases. The developed computational tool and models are achieved within the GIS system so the effective and efficient calculation methodology can be obtained, so the simulation problems of 4D ground movement due to underground mining extraction sequence can be solved by implementation of the developed tool in GIS.
文摘Based on Remote Sensing （RS）, Geographic Information System （GIS）, and combining Principal Component Analysis, this paper designed a numerical integrated evaluation model for mountain eco-environment on the base of grid scale. Using this model, we evaluated the mountain eco-environmental quality in a case study area-the upper reaches of Minjiang River, and achieved a good result, which accorded well with the real condition. The study indicates that, the integrated evaluation model is suitable for multi-layer spatial factor computation, effectively lowing man＇s subjective influence in the evaluation process; treating the whole river basin as a system, the model shows full respect to the circulation of material and energy, synthetically embodies the determining impact of such natural condition as water-heat and landform, as well as human interference in natural eco-system; the evaluation result not only clearly presents mountainous vertical distribution features of input factors, but also provides a scientific and reliable thought for quantitatively evaluating mountain eco-environment.
文摘当前配电网地理信息系统(geographical information system,GIS)与数据采集监控系统(supenvisory control and data acquisiton,SCADA)的集成策略存在着功能重复、数据描述及界面不统一等问题。通过对2系统的功能结构进行分析,引进组件对象模型技术,对各个功能模块在底层开发平台上进行集成,避免了重复开发,还提供了开放的子接口以便进行灵活的二次开发。对集成系统数据库的结构进行了分析,利用ActiveX数据对象技术等对数据库进行统一管理,GIS与SCADA等子系统之间基于平台接口函数直接交换数据,实现了无缝连接,保证了数据的一致性和系统的实时性。
