THE MEASUREMENT OF OBJECTS IN OPEN SEA WITH THE AID OF PHOTOGRAPHY (Izmerenie Predmetov v Otkrytom More s Pomoshchyu Fotografirovaniya)

• Main Author: Lebedev,V. L.
• Other Authors: NAVAL OCEANOGRAPHIC OFFICE WASHINGTON D C
• Format: Text
• Language: English
• Published: 1970
• Subjects: Snow; Ice and Permafrost; Optical Detection and Detectors; (*OCEAN SURVEILLANCE; ICE); (*FLOATING BODIES; MEASUREMENT); PHOTOGRAPHIC ANALYSIS; PHOTOGRAPHIC IMAGES; PHOTOINTERPRETATION; TRIANGULATION; ACCURACY; TRANSLATIONS; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/AD0705815; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0705815

By analyzing various methods used in determining the sizes of objects in the sea, notably icebergs and floes, it is found that the photographic method yields most accurate and quick results. Thus, the method is most advantageous from a practical point of view. The calculations and formulas used in connection with photographs are based on approximately 200 tests made during the ninth cruise of the Soviet Whaling Fleet 'Slava'. The relationship between the sizes of photographic images and natural objects is discussed in detail, defining mathematically the functions of focal length, inclination of camera toward the object to be photographed, the elevation of the camera above mean sea level and the effect of ship motion on the distortion of the true size of objects. The empirical formulas and correction of errors and for the improvement of the accuracy of the method are derived, examined and compared with the results of actual measurements. (Author) Trans. of Gosudarstvennyi Okeanograficheskii Institut. Trudy (USSR) v40 p156-162 1957, by M. Slessers.