A conceptual model called virtual borehole is presented in practice engineering.Based on borehole data and the geologic section and by using GMS 6.0,MAPGIS software,the 3D stratum model of urban geologic information i...A conceptual model called virtual borehole is presented in practice engineering.Based on borehole data and the geologic section and by using GMS 6.0,MAPGIS software,the 3D stratum model of urban geologic information is established.The visual expression and analysis of 3D geologic data can be better realized in the open model established.展开更多
Information model is adopted to integrate factors of various geosciences to estimate the susceptibility of geological hazards. Further combining the dynamic rainfall observations, Logistic regression is used for model...Information model is adopted to integrate factors of various geosciences to estimate the susceptibility of geological hazards. Further combining the dynamic rainfall observations, Logistic regression is used for modeling the probabilities of geological hazard occurrences, upon which hierarchical warnings for rainfall-induced geological hazards are produced. The forecasting and warning model takes numerical precipitation forecasts on grid points as its dynamic input, forecasts the probabilities of geological hazard occurrences on the same grid, and translates the results into likelihoods in the form of a 5-level hierarchy. Validation of the model with observational data for the year 2004 shows that 80% of the geological hazards of the year have been identified as "likely enough to release warning messages". The model can satisfy the requirements of an operational warning system, thus is an effective way to improve the meteorological warnings for geological hazards.展开更多
The key to develop 3-D GISs is the study on 3-D data model and data structure. Some of the data models and data structures have been presented by scholars. Because of the complexity of 3-D spatial phenomenon, there ar...The key to develop 3-D GISs is the study on 3-D data model and data structure. Some of the data models and data structures have been presented by scholars. Because of the complexity of 3-D spatial phenomenon, there are no perfect data structures that can describe all spatial entities. Every data structure has its own advantages and disadvantages. It is difficult to design a single data structure to meet different needs. The important subject in the3-D data models is developing a data model that has integrated vector and raster data structures. A special 3-D spatial data model based on distributing features of spatial entities should be designed. We took the geological exploration engineering as the research background and designed an integrated data model whose data structures integrats vector and raster data byadopting object-oriented technique. Research achievements are presented in this paper.展开更多
随着计算机技术的发展,三维设计引发了设计行业的巨大变革,但是水电站设计与地形结构关联较紧密,地形地质条件多变且电站异形设计较多,机械设备管线布置复杂,还停留在传统的二维软件制图阶段。将建筑信息模型(Building Information Mode...随着计算机技术的发展,三维设计引发了设计行业的巨大变革,但是水电站设计与地形结构关联较紧密,地形地质条件多变且电站异形设计较多,机械设备管线布置复杂,还停留在传统的二维软件制图阶段。将建筑信息模型(Building Information Modeling,BIM)理念引入水电站工程设计中,可以进行水电站三维模型可视化设计的研究,探讨BIM中地形地质模型的建立方法。针对水电站实例,进行三维可视化研究与仿真,搭建水电站三维结构模型实例,简要介绍模型设计的过程,并展示最终模型成果。展开更多
文摘A conceptual model called virtual borehole is presented in practice engineering.Based on borehole data and the geologic section and by using GMS 6.0,MAPGIS software,the 3D stratum model of urban geologic information is established.The visual expression and analysis of 3D geologic data can be better realized in the open model established.
基金the New Technology Generalization Project of China Meteorological Administration (CMATG2004M05)
文摘Information model is adopted to integrate factors of various geosciences to estimate the susceptibility of geological hazards. Further combining the dynamic rainfall observations, Logistic regression is used for modeling the probabilities of geological hazard occurrences, upon which hierarchical warnings for rainfall-induced geological hazards are produced. The forecasting and warning model takes numerical precipitation forecasts on grid points as its dynamic input, forecasts the probabilities of geological hazard occurrences on the same grid, and translates the results into likelihoods in the form of a 5-level hierarchy. Validation of the model with observational data for the year 2004 shows that 80% of the geological hazards of the year have been identified as "likely enough to release warning messages". The model can satisfy the requirements of an operational warning system, thus is an effective way to improve the meteorological warnings for geological hazards.
基金Project supported by the National Outstanding Youth Researchers Foundation (No.49525101)the Opening Research Foundation from LIESMARS(WKL(96)0302)
文摘The key to develop 3-D GISs is the study on 3-D data model and data structure. Some of the data models and data structures have been presented by scholars. Because of the complexity of 3-D spatial phenomenon, there are no perfect data structures that can describe all spatial entities. Every data structure has its own advantages and disadvantages. It is difficult to design a single data structure to meet different needs. The important subject in the3-D data models is developing a data model that has integrated vector and raster data structures. A special 3-D spatial data model based on distributing features of spatial entities should be designed. We took the geological exploration engineering as the research background and designed an integrated data model whose data structures integrats vector and raster data byadopting object-oriented technique. Research achievements are presented in this paper.
基金Supported by National Natural Science Foundation of China (No. 50179023) and Open Foundation of State Key Laboratory of High-Velocity Flow, Sichuan University (No.0404).
文摘描述空间趋势和地质的结构的复杂关系,基于地理信息系统和水力发电的工程地质学信息的可视化的数字建模被介绍。信息的函数视觉质问,空间切,绘画的节,和有水力的结构的联合分析被认识到。地质的模型能与地质的结构的形状数据匹配属性数据,并且为 3D 模型的空间质问和分析组织信息。用在 Laxiwa 水力发电的工程在上的应用 Huanghe 河在上游,方法提供 geoinformation,和溢洪道隧道的 geoinformationalong 轴的 3D 节看法的 a3D 平行节看法和质问结果,并且沿着有地下的结构的第 5 轴分别地。
文摘随着计算机技术的发展,三维设计引发了设计行业的巨大变革,但是水电站设计与地形结构关联较紧密,地形地质条件多变且电站异形设计较多,机械设备管线布置复杂,还停留在传统的二维软件制图阶段。将建筑信息模型(Building Information Modeling,BIM)理念引入水电站工程设计中,可以进行水电站三维模型可视化设计的研究,探讨BIM中地形地质模型的建立方法。针对水电站实例,进行三维可视化研究与仿真,搭建水电站三维结构模型实例,简要介绍模型设计的过程,并展示最终模型成果。