G - Physics – 01 – C
Patent
G - Physics
01
C
33/45
G01C 11/02 (2006.01) G01C 11/00 (2006.01)
Patent
CA 1222867
IMPROVED METHOD FOR THE STEREOPHOTOGRAMMETRIC SURVEY OF LARGE-DIMENSION OBJECTS ON SEA AND LAND ABSTRACT OF THE DISCLOSURE An improved method for the stereophotogrammetric survey of a large- dimension object of any location, in which the object, together with a chain, the length of which has been accurately pre-measured between two signals or reference markers thereon, is photographed from a height of about 30 m with two synchronised metric photographic cameras spaced apart by about 6 m, and on the stereoscopic optical model of the object reproduced by a stereoplotter there are made depth measurements (z axis) with the moving arrow of the stereoplotter at eight sets of points grouped in the eight conventional perimetral locations of photogrammetric orientation and evenly situated one half at the levels of the crests and the other half in the troughs of the ripples or undulations of the water or ground, the mean of the taken measurements is then calculated in order to determine the mean horizontal plane, and the model is correctly orientated with respect to said plane by suitable rotation, and finally the length of said chain is measured between its two said signals on the model orientated in this manner and the ratio of its value to said known pre-measured value gives the value of the reproduction scale.
455682
Agip S.p.a.
Robic Robic & Associes/associates
LandOfFree
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