The study on a new technology of waterway information system

It is a lot limitations to survey and design waterway by the CAD technique,due to timely variation of hydrology and ecology in the complicated estuary area,such as Changjing River estuary.In this paper,the advantages of GIS technique is applied to manage and process the multi kind,multi scale and multi time hydrographic parameters,including water depth,current velocity,tidal,waves,wind speed,temperature and salinity etc.,also to deal with different projection,different scale charts.Meanwhile,in the paper,combination techniques of GIS and CAD has been developed for unification of the charts for efficient management,two-way automatic carts conversion between GIS and CAD,automatic cutting and assemble of a number of Charts,flight path of the projection of spatial data and coordinate transformation.This new technique has been applied to survey and design waterway of Changing River estuary.The result shows that the combination technology of GIS and CAD has application potentiality in the waterway survey and design.     

利用FME的小城镇规划数据集成方法

多源数据集成和共享是实现区域规划的瓶颈问题.本文提出利用XDATA扩展数据的方法满足信息量需求,并针对数据集成过程中要素丢失等现象,编写VBA代码实现源数据的质量控制;提出利用FME重新定义数据以实现多源数据的语义转换和集成数据字典模式统一数据编码的数据集成方法.研究表明,该方法符合数字化、信息化测绘和管理数据的发展要求,能够提高数据生产和应用的效率,是一种实用且值得推广的方法.     

基于WEB的CAD文件协作管理系统设计的应用

针对目前公众参与城市规划研究中缺少有效技术保障的现状,提出了使用CAD文件网上发布管理的方法,提供公众参与城市规划设计与决策的平台,并对构建系统的主要技术、方法进行了阐述。     

矿井地质图件绘制中Auto CAD的应用

简要介绍了Auto CAD的特点及其在矿井地质图件绘制中的应用技巧,阐述了完成一幅地质图件的基本步骤,推荐了钻孔平面图绘制的专业化程序。      

From Rubble to Virtual Reality: Photogrammetry and the Virtual World of Ancient Ayutthaya, Thailand

For in excess of 100 years, photogrammetry has played a significant role in documenting the cultural heritage of nations and peoples. Many recent advances in the technique have enhanced the use of photogrammetry as a recording tool, enabling more complex representations of objects and moving access to the procedure from the expert to the interested user. Some of these recent developments include low cost digital photogrammetric systems, image sequence analysis, bundle adjustment and camera calibration procedures, and three dimensional laser scanning. An overview of some of these developments is given in this paper. The University of Melbourne, in conjunction with Chulalongkorn University in Bangkok, has been working on a project to create a computer visualization of the ancient Thai city of Ayutthaya. This project has blended three dimensional CAD models of the architectural features of Ayutthaya with historical research and artistic rendering to build a realistic representation of this city as it may have existed in the past. The model of the city has been built up from historical “maps”, aerial photographs, field survey and the use of photogrammetry to derive models of individual wat, chedi, prang (see GLOSSARY) and statuary. The historical research conducted in Thailand has provided the basis for the determination of the most likely location and appearance of the missing structures. The CAD models created from the photogrammetry have been visualized by the addition of surface textures and materials and rendered in as realistic a manner as possible. The virtual city has also been augmented by the incorporation of live actors in the computer reconstruction. When completed, the end product will be capable of producing an experience of daily life in Ayutthaya, with the potential for giving the user a level of interaction. The reconstruction will also be used as the basis of a variety of educational products to be produced in Thailand on a number of different media, including a bilingual CD-ROM already developed to “proof-of-concept” stage.     

基于CAD的高精度矿图数字化研究

对矿图信息化技术现状及煤矿地质数据的特征进行分析,在比较当前数字化方法的基础上,设计出一种基于煤矿原始导线控制点展绘的数字化方案,以某煤矿为例进行方案实施。同时研究了从原始数据电子化、电子数据导入、光栅图像处理等方面减小误差的方法,最大限度地提高了数字化精度。完成了矿图转变为计算机存储、编辑和输出图件的任务。为矿山企业提供快速、准确的决策依据。     

工业构件密集点云数据与CAD模型的配准

针对工业构件人工检测安装效率低的问题,该文提出基于三维激光扫描的点云数据与CAD模型的配准方法。该方法是预先在两模型中找出公共点进行粗配准,把粗配准后的两模型用迭代最近点(ICP)算法进行精确配准,并通过提取公共特征点进行匹配的精度检测。实验表明,通过该方法实现了点云与CAD模型的配准,有效地提高了工业逆安装效率。     

基于DWGdirect.NET与ArcGIS Engine的CAD地形图转换

根据AutoCAD及ESRI ArcGIS数据的特点,采用结合DWGDirect.NET与ArcGIS Engine编写系统实现CAD地形图到GIS数据的转换,并就早期AutoCAD成图与当前CASS成图提出不同的转换方案.     

提高大比例尺地形图数字化速度初探

本文就如何提高大比例尺地形图数字化速度，提出了几种简便而又实用的方法．灵活运用这些方法，可以较大地现高数字化速度．     

GPS与路线CAD数据的交换及应用

ＧＰＳ全球定位系统在公路勘测设计中已得到较为广泛的应用, 特别是实时动态ＲＴＫ 技术在测设中线方面的成功应用, 突破了常规红外测距仪或全站仪测设中线的方法。本文作者论述运用路线ＣＡＤ 程序和Ｗｏｒｋ Ｂｅｎｃｈ 软件相结合, 实现ＧＰＳ数据与路线ＣＡＤ 数据之间的传输交换, 并在周口至界首高速公路测量中得到成功地应用。