数字摄影测量在京化高速公路设计中的应用

本文所要讨论的是数字数字摄影测量在三维地形和公路设计方面的应用,就是如何通过航空摄影资料和摄影测量理论进行三维地形道路设计、管理分析提供科学有效的依据。既利用摄影测量的基本成果地形平面图的数据和数字高程模型(DEM)实现京化高速公路路段三维地形的显示和实时浏览,对干京化公路的选线、绕避不良地质灾害的发生和开凿隧道的位置选择等将会有一定的参考价值。     

一种适合于数字近景影像的绝对定向方法

数字近景影像的绝对定向同经典的航空摄影测量有很大的不同,为提高数字近景影像的绝对定向精度,提出了一种基于逐次相关条件平差模型的近景影像绝对定向方法。首先给出计算绝对定向参数初始值的严密公式。然后利用绝对定向方程的严密线性化形式进行逐次相关条件平差。同传统的基于经典间接平差的绝对定向方法相比,该方法可有效提高绝对定向的精度,非常适合于数字近景影像的绝对定向。     

摄影测量与遥感新技术在工程建设中的应用初探

结合摄影测量与遥感技术的发展及现状,回顾了摄影测量与遥感技术在工程建设各个方面的应用情况,并分析了近年来LIDAR,InSAR等新技术的发展趋势及其未来在我国工程勘查建设与维护中的应用潜力。     

基于单张航片确定人工地物高度技术的研究

高度信息作为人工地物的重要属性信息,在军事和民用上都具有很高的利用价值。针对人工地物高度提取的发展现状及存在的主要问题,对单张航片利用投影误差确定人工地物比高的原理和技术方法进行了研究,并进行了实验和精度分析,验证了方法的可行性。     

基于数字影像的大比例尺测图

介绍了数码相机及其系统误差,并在此基础上对相机进行了检校;基于航空摄影测量作业流程进行了航拍试验,分析得出数码航空摄影测量完全能满足大比例尺测图的要求,最后总结了数码相机进行航拍成图的几点结论。     

IKONOS立体影像全数字摄影测量试验研究

介绍了IKONOS立体影像应用于测图试验的情况,并对成果进行了分析和评价。通过试验研究其对于基本空间数据获取的可行性;考查其经济效益;综合评定其对于工程用图成图的可适用性。     

大直径钻孔灌注桩质量检测方法和存在的问题

阐述了大口径检测的重要意义,分析了目前大口质量检测的方法和存在的问题,并指出了解决这些问题的方法和途径。     

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.     

The Use of Close Range Photogrammetry for Studying Ice Accretion on Aerofoil Sections

This paper describes the use of photogrammetry to measure and quantify ice accretion on an aerofoil section. A series of stereoscopic photographs was taken during the ice accretion on the section in an icing tunnel. From measurements made on these photographs with a Kern (Leica) DSR 14 analytical photogrammetric plotter, a series of three dimensional models of the ice surfaces was constructed. The results of the project are discussed and possible improvements in the methodology are suggested.     

Photogrammetric Reverse Engineering of the "Angel of the North"

The Department of Geomatics and the Regional Centre for Innovation in Engineering Design in the University of Newcastle upon Tyne collaborated in a project to produce precise measurements for use in the fabrication of the body of the "Angel of the North" sculpture. This 20 m high edifice, by the sculptor Antony Gormley, is located adjacent to the A1(M) in Gateshead, Tyne and Wear.
This paper reviews the photogrammetric reverse engineering work carried out on a 1:10 scale plaster maquette of the "Angel of the North", which is a life-size model of the sculptor's body without any arms. The three dimensional measurements of the maquette, made by analytical photogrammetric techniques, were then processed to produce a fully functional three dimensional CAD model from which the dimensions needed by the fabricating company, Hartlepool Steel Fabrications Ltd., could be extracted. Additionally, the VirtuoZo digital photogrammetric software package was used to investigate the potential of automated measurement for this type of work and the results were compared with those obtained analytically.