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    block this user An-Ping Li

    Research Fellow

    Beijing 100085, P.R.China

    LARGE SCALE ORTHOPHOTOGRAPHY USING DTM FROM TERRESTRIAL LASER SCANNING

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    The production of orthophotographs at large scales for architectural photogrammetric applications faces a number of problems. The main difficulty arises when the ratio of the elevation differences on the object surface to the distance from the camera is large, or when there are surfaces with poor definition or little texture. In these cases the standard automatic DTM production algorithms fail to produce a useful product. A digital surface model (DSM) from laser scanning could be used as an alternative. This paper explores the contribution of laser scanner data, the improvement in the accuracy and the level of automation for the production of large scale orthophotos. A case study is presented using data collected from a 15 th century Byzantine church comprising a variety of surfaces. In addition to conventional geodetic and photogrammetric data acquisition, a Cyrax 2500 laser scanner was used to collect data from varying surfaces. Comparisons between orthophotographs from conventional procedure and combined use of photogrammetry and laser scanning are made to highlight the advantage of the latter in eliminating the need for lengthy photogrammetric DSM extraction and editing, in particular for the geometric recording of monuments and archaeological sites. 1.

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    Title : LARGE SCALE ORTHOPHOTOGRAPHY USING DTM FROM TERRESTRIAL LASER SCANNING
    Abstract : The production of orthophotographs at large scales for architectural photogrammetric applications faces a number of problems. The main difficulty arises when the ratio of the elevation differences on the object surface to the distance from the camera is large, or when there are surfaces with poor definition or little texture. In these cases the standard automatic DTM production algorithms fail to produce a useful product. A digital surface model (DSM) from laser scanning could be used as an alternative. This paper explores the contribution of laser scanner data, the improvement in the accuracy and the level of automation for the production of large scale orthophotos. A case study is presented using data collected from a 15 th century Byzantine church comprising a variety of surfaces. In addition to conventional geodetic and photogrammetric data acquisition, a Cyrax 2500 laser scanner was used to collect data from varying surfaces. Comparisons between orthophotographs from conventional procedure and combined use of photogrammetry and laser scanning are made to highlight the advantage of the latter in eliminating the need for lengthy photogrammetric DSM extraction and editing, in particular for the geometric recording of monuments and archaeological sites. 1.
    Subject : unspecified
    Area : Mathematics
    Language : English
    Affiliations
    Url : http://www.isprs.org/istanbul2004/comm5/papers/599.pdf
    Doi : 10.1.1.62.1692

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    An-Ping's Peer Evaluation activity

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