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  • 1
    Electronic Resource
    Electronic Resource
    Application and Accuracy of Two Fixed Base Camera Systems (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 discusses the application of two fixed base non-metric camera systems. The first is a helicopter supported 5m boom carrying two 70 mm Hasselblad cameras, fired simultaneously. The 1;850 scale stereomodels, each covering about 40 ×45 m, were used to measure individual tree characteristics, such as crown closure and size. The second system is a portable camera platform designed for microtopography, which used sequential Minolta 35mm photography (1;80 scale) for generating DEMs and computing volume of soil erosion. In both cases, an analytical plotter was used to collect measurements without ground control. With the helicopter boom system, distances and heights were measured to within 5 per cent of true dimensions. With the portable platform system, volume estimates were within 1 per cent of field measurement values. Particular attention is given to the orientation and scaling of stereopairs. Because the air base is used to scale the model, errors in scale due to non-parallel lines of sight are avoided. Advantages and disadvantages of both systems are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00133
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  • 2
    Electronic Resource
    Electronic Resource
    Measuring Off Cropped Enlargements with a Digitizing Tablet (1996)
    Oxford UK and Boston, USA : Blackwell Publishers Ltd.
    The @photogrammetric record 15 (1996), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: A standard digitizing tablet was used to measure objects off cropped enlargements (1:1000 scale), with an absolute accuracy of 0.75 m. Interior orientation for the enlargements was based upon camera reference marks captured from the original photographs, ranging from 1:6000 to 1:15 000 scale. Control for exterior orientation was provided by 1:1000 scale maps. Operational procedures are outlined, followed by results from eight sample photographs. Particular attention is devoted to errors that influence measurement accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00068
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  • 3
    Electronic Resource
    Electronic Resource
    Bundle Adjustment For 35 mm Oblique Aerial Photography (1995)
    Oxford UK and Boston, USA : Blackwell Publishers Ltd.
    The @photogrammetric record 15 (1995), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The full provision of ground control points for oblique, small format photography used for mapping purposes is uneconomic because each photograph covers a small area of ground. This paper describes the implementation of a bundle adjustment program for 35 mm oblique aerial photography. Image co-ordinates are measured on enlarged prints, with a digitizing tablet driven by Carto MDSD software, and are then processed with the NLHBUNT program. The measurement system was proved by using vertical standard format photographs of a test block saturated with high quality ground control. Measurements taken with the MDSD system gave acceptable accuracy when compared with a set taken with a Zeiss P3 analytical workstation. A bundle adjustment was then carried out with the MDSD data; the results obtained compared satisfactorily with known ground values. A hand-held 35 mm Pentax LX camera was flown over the test site and three strips of 1:30 000 scale oblique photography were obtained. Following bundle adjustment, the empirical accuracy of derived co-ordinates was about 1.5 m in X, 3 m in Y and 2 m in Z. Factors affecting this accuracy are discussed and further developments of the system are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00027
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  • 4
    Electronic Resource
    Electronic Resource
    IMPROVING INTERIOR ORIENTATION FOR ASMALL STANDARD CAMERA (1991)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 13 (1991), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Interior orientation (the initial step in comparator-based photogrammetry) requires a set of known photo co-ordinates to act as reference points. Fiducials serve this purpose on large format, metric cameras, as do réseau targets on small format, semi-metric cameras. Most small format cameras, however, have neither fiducials nor a réseau plate. The aim of this study was to establish fiducials in a small standard camera (Pentax 645) so that its imagery could be used for photogrammetric computations. This paper describes two methods of establishing fiducials, followed by a comparison of their stability and suitability for photogrammetric purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.1991.tb00758.x
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  • 5
    Electronic Resource
    Electronic Resource
    Creating digital terrain models from 35 mm PHOTOGRAPHY (1989)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 13 (1989), 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.1477-9730.1989.tb00676.x
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  • 6
    Electronic Resource
    Electronic Resource
    DEVELOPMENT OF A MONOSCOPIC MEASUREMENT SYSTEM FOR SMALL FORMAT OBLIQUE PHOTOGRAPHY (1992)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 14 (1992), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper discusses development of a monoscopic measurement system for oblique photography, based upon space resection by collinearity. The method consists of enlarging 35 mm slides with a colour laser scanned copier, then digitising surveyed targets with a standard digitising tablet. Particular attention is given to systematic errors introduced by enlarging and digitising as well as to the accuracy of space resection solutions. 〈section xml:id="abs1-2"〉〈title type="main"〉Résumé On examine dans cet article le développement ďun systeme de mesure monoscopique pour photographies obliques, basé sur le relèvement dans ľespace et les équations de colinéarité. La méthode consiste à agrandir dans un copieur balayé par un laser de couleur, les diapositives 35 mm, puis à numériser sur une petite table à numériser standard les cibles qui ont été relevées. Les erreurs systématiques provenant de ľagrandissement et de la numérisation font ľobjet ďune attention particulière, ainsi que la précision des solutions du relévement dans ľespace. 〈section xml:id="abs1-3"〉〈title type="main"〉Zusammenfassung Im Artikel wird die Entwicklung eines monoskopischen Meβsystems für Schrägbilder diskutiert, das auf dem Rückwärtseinschnitt nach der Kolli-nearitätsbedingung beruht. Die Methode basiert auf der Vergröβergung von 35 mm-Diapositiven mit einem Laser-Farbkopierer und der nachfolgenden Digitalisierung vermessener Zieltafeln mit einem Standard-Digitalisier-tablett. Besondere Aufmerksamkeit wird sowohl den systematischen Feh-lern, die durch Vergröβerung und Digitalisierung entstehen, als auch der Genauigkeit der räumlichen Berechnungen gewidmet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.1992.tb00255.x
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  • 7
    Electronic Resource
    Electronic Resource
    Multiplotting With Images from the Kodak DCS420 Digital Camera (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: This paper explores the potential of a digital camera to produce multiple images suitable for plotting. The objective was to build a three dimensional database by linking triangulated images from a Kodak DCS420 digital camera with a computer aided measurement system. The system then supplied X, Y, Z data from x, y image co-ordinates captured off two or more images. Relative accuracy in object space was around 1;50 000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0031-868X.00076
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  • 8
    Electronic Resource
    Electronic Resource
    GIS DATA CAPTURE FROM AERIAL PHOTOGRAPHS: A CASE STUDY (1991)
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 13 (1991), S. 0 
    Details
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: A case study at the Norwegian Institute of Land Inventory (NIJOS) demonstrates that photogrammetry is an effective method for collecting data for geographical information systems (GIS). The process of establishing a photogrammetric data capture system is explained with special attention devoted to financial and personnel considerations. It is argued that photogrammetric data capture is viable provided that a stereodigitiser is used in conjunction with a modular solution GIS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-9730.1991.tb00731.x
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