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  • Articles  (65,990)
  • 2005-2009  (31,732)
  • 1995-1999  (22,006)
  • 1980-1984  (12,252)
  • Architecture, Civil Engineering, Surveying  (65,990)
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  • Articles  (65,990)
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  • 1
    Electronic Resource
    Electronic Resource
    Low Cost Digital Rectification on A PC (1997)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 15 (1997), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Digital photogrammetric techniques have opened fresh horizons and have enabled photogrammetry to become a more user friendly tool for a wide range of applications. However cost remains a critical issue, because new digital photogrammetric workstations and their related software are considered expensive. This paper examines the problem of digital rectification and presents low cost solutions involving the use of commercial off the shelf software packages, which include graphics and painting software, image processing tools and a CAD system. Additionally, specially developed software performing vector rectification is described and discussed. All the packages have been used for rectifying digital images and the results are presented. An attempt is also made to assess the accuracy and reliability of the results. Finally, several alternative digital products are presented, mainly concerning the use of the methods described in the restitution of cultural monuments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00079
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  • 2
    Electronic Resource
    Electronic Resource
    Digital Photogrammetric Monitoring of River Bank Erosion (1997)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 15 (1997), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Detailed understanding of the processes which control river bank erosion requires high resolution information concerning temporal changes in bank morphology. This paper describes the successful use of digital photogrammetry to extract high resolution digital elevation models (DEMs) from terrestrial oblique stereopairs of rapidly eroding river banks, using the commercial software package Erdas Imagine. This software was developed for use with aerial photography and satellite imagery; problems relating to the use of oblique terrestrial images are discussed and solutions presented. Photography was acquired using semi-metric cameras, mounted on tripods and positioned about 15m from the eroding bank. Data for DEM point spacings of 20mm were obtained, with accuracies of approximately ±12mm in depth. Digital photogrammetry can permit faster analysis, provide better accuracies and involve less ground disturbance than conventional methods of monitoring river channel change. Most importantly, DEM generation is considered to be more useful than traditionally acquired points or profiles for landform monitoring strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00083
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Towards a New Approach for Absolute and Exterior Orientation (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper briefly examines the current position in absolute and exterior orientation and highlights some of the limitations of existing techniques. An alternative system for performing absolute orientation and, potentially, exterior orientation is introduced. Some preliminary tests have given encouraging results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00142
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  • 4
    Electronic Resource
    Electronic Resource
    Photogrammetric Capabilities of the Kodak DC40, DCS420 and DCS460 Digital Cameras (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The aim of this study is to assess the impact of sensor size and resolution of different digital camera sensors upon the accuracy and precision of three dimensional data derived by photogrammetry. Kodak DC40, DCS420 and DCS460 digital cameras were used to produce digital images of retroreflective targets in a 4 m three dimensional test field. The image locations of the targeted points were automatically measured using an off the shelf image processing software package. Two different sub-pixel measurement approaches were examined: centre of gravity and weighted mean. From the automated sub-pixel measurement of the targeted points, results indicate that the high resolution DCS460 camera produces optimum results using either the weighted mean or centre of gravity approaches. Although this was perhaps expected, the far lower resolution DC40 camera performed better than was originally anticipated, suggesting potential for the cheaper DC40 for many applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00141
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  • 5
    Electronic Resource
    Electronic Resource
    Vision Metrology and Three Dimensional Visualization in Structural Testing and Monitoring (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper describes initial work carried out to advance the use of vision metrology and three dimensional visualization techniques in structural testing and monitoring. A description is given of a methodology for semi-automatically generating dynamic three dimensional computer graphics models, which is employed to provide a three dimensional spatial framework for conventional engineering instrumentation. The use of techniques developed for two structural measurement applications is explained and opportunities for current and future research are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00143
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  • 6
    Electronic Resource
    Electronic Resource
    Orthophotograph Production in Urban Areas (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper investigates possible solutions to the problem of urban orthophotography. Extensive work has been carried out to attain the best possible results, using all the existing software in the Department of Geomatic Engineering, University College London. Two of the most promising methods, which yield the best results, are analysed further. New routines were written in C language, as additions to the existing software, to allow for the special problems that arise in urban areas. The final results overcome the problem of double mapping (or occlusions) and will potentially enable even greater success to be achieved. A simple accuracy assessment of the results has been made. Difficulties and current limitations are analysed and presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00144
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  • 7
    Electronic Resource
    Electronic Resource
    The Use of Close Range Photogrammetry for Studying Ice Accretion on Aerofoil Sections (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00146
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  • 8
    Electronic Resource
    Electronic Resource
    Rectification of Slant Range Imagery Through a Direct Image to Ground Relationship (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: A theoretical model for describing a direct image to ground relationship for slant range images extracted from synthetic aperture radar imaging satellites (for instance ERS-1 and ERS-2) is formulated. The rigorous orbital model is based on orbital parameters. Transformations and equations describing the relationship are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00147
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  • 9
    Electronic Resource
    Electronic Resource
    VALETE! (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.1999.tb01529.x
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  • 10
    Electronic Resource
    Electronic Resource
    From Rubble to Virtual Reality: Photogrammetry and the Virtual World of Ancient Ayutthaya, Thailand (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 16 (1999), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00145
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