METHOD OF MEASURING CHANGES IN POSITION OF POINTS OF OBJECT Russian patent published in 1994 - IPC

FIELD: photogrammetry. SUBSTANCE: reference points are selected onto the object, and coordinates of the points are determined. No less than three additional points are selected onto the object, and correction directions to these points are determined by means of angular instrument. Then phototheodolite survey of the object is carried out periodically from basic points. After any cycle of phototheodolite survey is finished, stereoscopic pair of photographs are available and object model may be constructed. Model is oriented in space with using achieved values of correction directions. Model constructed, is scale with using no less than three reference points, and achieved results are processed. Coordinates of object's points are found and compared with coordinates of corresponding points of preceding cycle. EFFECT: improved precision.