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Alternative methods for determining the altitude of theodolite observation stations
Author(s) -
Frankel Adam S.,
Yin Suzanne,
Hoffhines Michael A.
Publication year - 2009
Publication title -
marine mammal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.723
H-Index - 78
eISSN - 1748-7692
pISSN - 0824-0469
DOI - 10.1111/j.1748-7692.2008.00240.x
Subject(s) - marine mammal , mammal , archaeology , library science , history , ecology , biology , computer science
whale, dolphin,or vessel) is to measure the angles of declination and bearing from the shore stationto the waterline of the target. With a known elevation above sea level, the declina-tion angle can be converted to a distance (Lerczak and Hobbs 1998). Thus distancemeasurement accuracy is a direct function of elevation measurement accuracy. Thedistance, combined with the bearing, provides the polar coordinates from the shorestation to the target object. The polar coordinates can then be converted to Carte-sian coordinates relative to the shore station or into latitude and longitude values.Compass-equipped reticle binoculars can provide acceptable measures of locationin some situations (Yin