Digitale Medien
Oxford, UK
:
Blackwell Publishing Ltd
The @photogrammetric record
16 (1999), S. 0
ISSN:
1477-9730
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Architektur, Bauingenieurwesen, Vermessung
Notizen:
Dolphins are agile animals and are very difficult to measure at sea. However, for the conservation of threatened or endangered species, measurement may be vital because it allows a demographic analysis of the population. Hector's dolphin (Cephalorhynchus hectori) is a rare species living only in coastal waters around New Zealand where it is studied from small boats. This paper describes a stereophotogrammetric technique developed to measure body length accurately at sea without having to capture the individual. Constant calibration with the use of a control frame allowed accurate body length measurements of dolphins to be made with this low cost system, with a measurement error of 4 per cent to 6 per cent of actual length.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/0031-868X.00139
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