| 摘要 |
The procedure consists of determining by optical sighting with tachymeters (9) and triangulation the positions of at least three target points (12a, 12b, 12c; 13a, 13b, 13c) in a portion of a pipe circuit and its environment and determining, from the target points' positions, a virtual orthonormed reference map (11) and the co-ordinates of the target centers in relation to it. The scene is then scanned optically with a laser beam associated with a CCD camera to obtain the scatter of representative points of the pipe circuit and targets, and the coordinates of the points are determined on the orthonomed virtual reference map from the calculated distances between the representative points and target centers.
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