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n.1.The doctrine of polygons; an extension of some of the principles of trigonometry to the case of polygons.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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It is composed of line-wise measurements in boreholes with a sliding micrometer and a modified inclinometer (accuracy of displacement on the top of the casing in the order of 0.01 mm in the vertical and less than 0.5 mm in the horizontal direction), high accuracy levelling and accurate polygonometry (accuracy in the order of 0.1 up to 1.0 mm) and GPS measurements with the use of base and rover stations.