经天路图是基于三维GIS系统的公路综合设计平台,为了使用户在该软件的使用过程中,准确表达设计理念和思想,需要开发在三维地球场景下的精确绘制图形功能。本文基于中科图新LocaSpaceSDK开发工具包,,使用C#语言在Visual Studio 2019平台...经天路图是基于三维GIS系统的公路综合设计平台,为了使用户在该软件的使用过程中,准确表达设计理念和思想,需要开发在三维地球场景下的精确绘制图形功能。本文基于中科图新LocaSpaceSDK开发工具包,,使用C#语言在Visual Studio 2019平台上开发了基础图元(点、线、多段线、圆、圆弧)绘制功能、特殊点(端点、图元之间的交点、垂足等)捕捉以及正交绘图、延长线追踪等辅助绘图功能。本文介绍了基础绘图功能的研发思路、工具、流程及关键算法,并展示了绘图功能的工程应用。结果表明,本文开发的基础绘图功能可以便捷、快速、准确地帮助用户表达设计理念和思路,提升设计效率。展开更多
Lifelines, such as pipeline, transportation, communication, electric transmission and medical rescue systems, are complicated networks that always distribute spatially over large geological and geographic units. The q...Lifelines, such as pipeline, transportation, communication, electric transmission and medical rescue systems, are complicated networks that always distribute spatially over large geological and geographic units. The quantification of their reliability under an earthquake occurrence should be highly regarded, because the performance of these systems during a destructive earthquake is vital in order to estimate direct and indirect economic losses from lifeline failures, and is also related to laying out a rescue plan. The research in this paper aims to develop a new earthquake reliability calculation methodology for lifeline systems. The methodology of the network reliability for lifeline systems is based on fault tree analysis （FTA） and geological information system （GIS）. The interactions existing in a lifeline system ale considered herein. The lifeline systems are idealized as equivalent networks, consisting of nodes and links, and are described by network analysis in GIS. Firstly, the node is divided into two types： simple node and complicated node, where the reliability of the complicated node is calculated by FTA and interaction is regarded as one factor to affect performance of the nodes. The reliability of simple node and link is evaluated by code. Then, the reliability of the entilre network is assessed based on GIS and FTA. Lastly, an illustration is given to show the methodology.展开更多
Artificial Neural Network(ANN)models have been extensively applied in the prediction of water resource variables,and Geographical Information System(GIS)includes powerful functions to visualize spatial data.In order t...Artificial Neural Network(ANN)models have been extensively applied in the prediction of water resource variables,and Geographical Information System(GIS)includes powerful functions to visualize spatial data.In order to provide an efficient tool for environmental assessment and management that combines the advantages of these two modules,a GIS-based ANN water quality prediction system was developed in the present study.The ANN module and ArcGIS Engine module,along with a dynamic database,were imbedded in the system,which integrates water quality prediction via the ANN model and spatial presentation of the model results.The structure of the ANN model could be modified through the graphical user interface to optimize the model performance.The developed system was applied to a real case study for the prediction of the total phosphorus concentration in the Lake Champlain area.The prediction results were verified with the monitoring data,and the performance of the developed model was further evaluated through graphical techniques and quantitative statistical methods.Overall,the developed system provided satisfactory prediction results,and spatial distribution maps of the predicted results were obtained,which coincided with the monitored values.The developed GIS-based ANN water quality prediction system could serve as an efficient tool for engineers and decision makers.展开更多
Digital Elevation Models (DEMs) are constructed using altitude point data and various interpolation techniques. The quality and accuracy of DEMs depend on data point density and the interpolation technique used. Usual...Digital Elevation Models (DEMs) are constructed using altitude point data and various interpolation techniques. The quality and accuracy of DEMs depend on data point density and the interpolation technique used. Usually however, altitude point data especially in plain areas do not provide realistic DEMs, mainly due to errors produced as a result of the interpolation technique, resulting in imprecise topographic representation of the landscape. Such inconsistencies, which are mainly in the form of surface depressions, are especially crucial when DEMs are used as input to hydrologic modeling for impact studies, as they have a negative impact on the model’s performance. This study presents a Geographical Information System (GIS) tool, named LAN (Line Attribute Network), for the improvement of DEM construction techniques and their spatial accuracy, using drainage network attributes. The developed tool does not alter the interpolation technique, but provides higher point density in areas where most DEM problems occur, such as lowland areas or places where artificial topographic features exist. Application of the LAN tool in two test sites showed that it provides considerable DEM improvement.展开更多
为优化海绵城市雨污分流规划效果,提高污水集中收集率,改善城市水环境,利用地理信息系统(Geographic Information System,GIS)开展海绵城市雨污分流排水管网规划研究。首先,采集海绵城市的基础地理数据、气象水文数据及城市设施数据,利...为优化海绵城市雨污分流规划效果,提高污水集中收集率,改善城市水环境,利用地理信息系统(Geographic Information System,GIS)开展海绵城市雨污分流排水管网规划研究。首先,采集海绵城市的基础地理数据、气象水文数据及城市设施数据,利用GIS技术建立空间数据库;其次,对海绵城市进行水文模拟,估计地表径流产生量与降雨初期径流量,获取全面的水文数据支持;最后,确定污水管道的最大设计流量,规划雨污分流排水管网,使雨水和生活污水分别排入两个不同的排水干道。实验结果表明,该方法在不同降雨条件下均表现出较高的污水集中收集率,有效提高了雨污分流排水管网运行效果。展开更多
目前,煤矿使用的工程专题地图基本都是CAD制图,高效提取CAD图件中的数据并快速组织成地理信息系统(GIS)服务,进而支持矿井空间对象创建和业务属性扩展,集成安全生产实时数据,是构建煤矿GIS一张图的关键。基于ArcGIS平台将CAD图件转为GI...目前,煤矿使用的工程专题地图基本都是CAD制图,高效提取CAD图件中的数据并快速组织成地理信息系统(GIS)服务,进而支持矿井空间对象创建和业务属性扩展,集成安全生产实时数据,是构建煤矿GIS一张图的关键。基于ArcGIS平台将CAD图件转为GIS服务的方法实现过程较为繁琐,且ArcGIS平台成本较高,无法较好地跨平台运行。针对该问题,设计了一种煤矿GIS一张图快速构建平台。该平台包括CAD图件管理、地图服务发布、专题地图管理3大功能模块:CAD图件管理模块用于图件基础信息管理和状态跟踪,地图服务发布模块用于地图打包发布和在线预览,专题地图管理模块用于地图服务管理、矿井对象创建及属性扩展。基于开放设计联盟(ODA)的Teigha for Java SDK实现CAD图件全要素精确识别与快速准确提取;通过构建基于GIS数据特征的煤矿CAD图件数据分层描述模型,实现了CAD图件全要素数据快速存储;按照面向对象设计思路,开发了Spring Cloud框架下的Web端煤矿CAD图件数据集存储接口及专题地图服务发布平台,实现了煤矿GIS一张图快速构建。以某煤矿采掘工程平面图为例,分别采用传统方法和快速构建平台进行煤矿GIS一张图的构建,对比结果表明,快速构建平台可大幅提高煤矿GIS一张图的构建效率,为煤矿智能化建设提供时空数字底座。展开更多
为了缓解有线电视网络资源系统多级运营商重复投资、盲目建设的风险,设计了基于MapGIS数据中心技术的有线电视网络资源管理平台.该平台封装了有线电视网络资源管理中常用功能和资源数据模型,支持以零编程、巧组合和易搭建的方式,快速构...为了缓解有线电视网络资源系统多级运营商重复投资、盲目建设的风险,设计了基于MapGIS数据中心技术的有线电视网络资源管理平台.该平台封装了有线电视网络资源管理中常用功能和资源数据模型,支持以零编程、巧组合和易搭建的方式,快速构建有线电视网络资源地理信息系统(geographic information system,GIS)应用系统.经过项目验证,开发类似行业GIS应用系统时,在保证质量的前提下,能够节省80%开发成本.展开更多
文摘经天路图是基于三维GIS系统的公路综合设计平台,为了使用户在该软件的使用过程中,准确表达设计理念和思想,需要开发在三维地球场景下的精确绘制图形功能。本文基于中科图新LocaSpaceSDK开发工具包,,使用C#语言在Visual Studio 2019平台上开发了基础图元(点、线、多段线、圆、圆弧)绘制功能、特殊点(端点、图元之间的交点、垂足等)捕捉以及正交绘图、延长线追踪等辅助绘图功能。本文介绍了基础绘图功能的研发思路、工具、流程及关键算法,并展示了绘图功能的工程应用。结果表明,本文开发的基础绘图功能可以便捷、快速、准确地帮助用户表达设计理念和思路,提升设计效率。
基金Sponsored by the Natural Science Foundation of China (Grant No.50278028) the Scientific Research Foundation of Harbin Institute of Technology(Grant No.HIT200079).
文摘Lifelines, such as pipeline, transportation, communication, electric transmission and medical rescue systems, are complicated networks that always distribute spatially over large geological and geographic units. The quantification of their reliability under an earthquake occurrence should be highly regarded, because the performance of these systems during a destructive earthquake is vital in order to estimate direct and indirect economic losses from lifeline failures, and is also related to laying out a rescue plan. The research in this paper aims to develop a new earthquake reliability calculation methodology for lifeline systems. The methodology of the network reliability for lifeline systems is based on fault tree analysis （FTA） and geological information system （GIS）. The interactions existing in a lifeline system ale considered herein. The lifeline systems are idealized as equivalent networks, consisting of nodes and links, and are described by network analysis in GIS. Firstly, the node is divided into two types： simple node and complicated node, where the reliability of the complicated node is calculated by FTA and interaction is regarded as one factor to affect performance of the nodes. The reliability of simple node and link is evaluated by code. Then, the reliability of the entilre network is assessed based on GIS and FTA. Lastly, an illustration is given to show the methodology.
基金Supported by the National Natural Science Foundation of China(Nos.41807247,41807229)the Special Fund for Shandong Post-doctoral Innovation Project。
文摘Artificial Neural Network(ANN)models have been extensively applied in the prediction of water resource variables,and Geographical Information System(GIS)includes powerful functions to visualize spatial data.In order to provide an efficient tool for environmental assessment and management that combines the advantages of these two modules,a GIS-based ANN water quality prediction system was developed in the present study.The ANN module and ArcGIS Engine module,along with a dynamic database,were imbedded in the system,which integrates water quality prediction via the ANN model and spatial presentation of the model results.The structure of the ANN model could be modified through the graphical user interface to optimize the model performance.The developed system was applied to a real case study for the prediction of the total phosphorus concentration in the Lake Champlain area.The prediction results were verified with the monitoring data,and the performance of the developed model was further evaluated through graphical techniques and quantitative statistical methods.Overall,the developed system provided satisfactory prediction results,and spatial distribution maps of the predicted results were obtained,which coincided with the monitored values.The developed GIS-based ANN water quality prediction system could serve as an efficient tool for engineers and decision makers.
文摘Digital Elevation Models (DEMs) are constructed using altitude point data and various interpolation techniques. The quality and accuracy of DEMs depend on data point density and the interpolation technique used. Usually however, altitude point data especially in plain areas do not provide realistic DEMs, mainly due to errors produced as a result of the interpolation technique, resulting in imprecise topographic representation of the landscape. Such inconsistencies, which are mainly in the form of surface depressions, are especially crucial when DEMs are used as input to hydrologic modeling for impact studies, as they have a negative impact on the model’s performance. This study presents a Geographical Information System (GIS) tool, named LAN (Line Attribute Network), for the improvement of DEM construction techniques and their spatial accuracy, using drainage network attributes. The developed tool does not alter the interpolation technique, but provides higher point density in areas where most DEM problems occur, such as lowland areas or places where artificial topographic features exist. Application of the LAN tool in two test sites showed that it provides considerable DEM improvement.
文摘为优化海绵城市雨污分流规划效果,提高污水集中收集率,改善城市水环境,利用地理信息系统(Geographic Information System,GIS)开展海绵城市雨污分流排水管网规划研究。首先,采集海绵城市的基础地理数据、气象水文数据及城市设施数据,利用GIS技术建立空间数据库;其次,对海绵城市进行水文模拟,估计地表径流产生量与降雨初期径流量,获取全面的水文数据支持;最后,确定污水管道的最大设计流量,规划雨污分流排水管网,使雨水和生活污水分别排入两个不同的排水干道。实验结果表明,该方法在不同降雨条件下均表现出较高的污水集中收集率,有效提高了雨污分流排水管网运行效果。
文摘目前,煤矿使用的工程专题地图基本都是CAD制图,高效提取CAD图件中的数据并快速组织成地理信息系统(GIS)服务,进而支持矿井空间对象创建和业务属性扩展,集成安全生产实时数据,是构建煤矿GIS一张图的关键。基于ArcGIS平台将CAD图件转为GIS服务的方法实现过程较为繁琐,且ArcGIS平台成本较高,无法较好地跨平台运行。针对该问题,设计了一种煤矿GIS一张图快速构建平台。该平台包括CAD图件管理、地图服务发布、专题地图管理3大功能模块:CAD图件管理模块用于图件基础信息管理和状态跟踪,地图服务发布模块用于地图打包发布和在线预览,专题地图管理模块用于地图服务管理、矿井对象创建及属性扩展。基于开放设计联盟(ODA)的Teigha for Java SDK实现CAD图件全要素精确识别与快速准确提取;通过构建基于GIS数据特征的煤矿CAD图件数据分层描述模型,实现了CAD图件全要素数据快速存储;按照面向对象设计思路,开发了Spring Cloud框架下的Web端煤矿CAD图件数据集存储接口及专题地图服务发布平台,实现了煤矿GIS一张图快速构建。以某煤矿采掘工程平面图为例,分别采用传统方法和快速构建平台进行煤矿GIS一张图的构建,对比结果表明,快速构建平台可大幅提高煤矿GIS一张图的构建效率,为煤矿智能化建设提供时空数字底座。
文摘为了缓解有线电视网络资源系统多级运营商重复投资、盲目建设的风险,设计了基于MapGIS数据中心技术的有线电视网络资源管理平台.该平台封装了有线电视网络资源管理中常用功能和资源数据模型,支持以零编程、巧组合和易搭建的方式,快速构建有线电视网络资源地理信息系统(geographic information system,GIS)应用系统.经过项目验证,开发类似行业GIS应用系统时,在保证质量的前提下,能够节省80%开发成本.
