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PARALLAX BAR HEIGHT MEASUREMENTS FROM LARGE FORMAT CAMERA PHOTOGRAPHY
Author(s) -
Lo C. P.
Publication year - 1987
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.1477-9730.1987.tb00597.x
Subject(s) - parallax , photography , stereoscopy , bar (unit) , computer graphics (images) , scale (ratio) , computer science , artificial intelligence , computer vision , geology , geography , art , cartography , visual arts , oceanography
The accuracy of heighting from Large Format Camera (LFC) stereo‐photographs of the New England area was evaluated using a conventional mirror stereoscope equipped with × 6 binocular eyepieces and a precision parallax bar. It was discovered that a large differential ω had to be removed before acceptable height results could be obtained. Enlarged portions of the LFC photographs covering city areas of Boston, Massachusetts and Providence, Rhode Island could be used to produce accurate height results. It was concluded that analogue mapping from LFC photography using simple instruments could be economically carried out at a scale of 1:1 or smaller, with a contour interval of 100 m to 120 m.