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HIGH PRECISION LEVELLING OF MOTORWAYS. BY LOW LEVEL HELICOPTER SURVEY
Author(s) -
Boardman J. C.
Publication year - 1994
Publication title -
the photogrammetric record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 51
eISSN - 1477-9730
pISSN - 0031-868X
DOI - 10.1111/j.1477-9730.1994.tb00294.x
Subject(s) - levelling , scale (ratio) , computer science , aerial survey , engineering , transport engineering , systems engineering , remote sensing , geography , geodesy , cartography
Photogrammetrists are acutely aware that remote methods of survey are commonplace. However, it is only relatively recently that high precision levelling of the national motorway network has been conducted in this manner. There are now several competing methods available, all of which have gained some acceptance. This paper describes a low level aerial photographic method employing a helicopter as the platform. It begins with the reasons for the development, describes the system and methods involved, addresses the safety aspects, attempts to outline the necessity for the largest scale possible to maintain precision, analyses the potential developments and discusses the advantages and disadvantages compared with ground based systems.