IMPROVED METHOD FOR THE STEREOPHOTOGRAMMETRIC SURVEYOF LARGE-DIMENSION OBJECTS ON SEA AND LANDABSTRACT OF THE DISCLOSUREAn improved method for the stereophotogrammetric survey of a large-dimension object of any location, in which the object, togetherwith a chain, the length of which has been accurately pre-measuredbetween two signals or reference markers thereon, is photographedfrom a height of about 30 m with two synchronised metric photographiccameras spaced apart by about 6 m, and on the stereoscopic opticalmodel of the object reproduced by a stereoplotter there are madedepth measurements (z axis) with the moving arrow of the stereoplotterat eight sets of points grouped in the eight conventional perimetrallocations of photogrammetric orientation and evenly situated onehalf at the levels of the crests and the other half in the troughsof the ripples or undulations of the water or ground, the mean ofthe taken measurements is then calculated in order to determinethe mean horizontal plane, and the model is correctly orientatedwith respect to said plane by suitable rotation, and finally thelength of said chain is measured between its two said signals onthe model orientated in this manner and the ratio of its valueto said known pre-measured value gives the value of the reproductionscale.
展开▼
