Abstract
An adjustment method of angular and distance measurements for densification of horizontal control is presented, where the resulting network has the properties of a free net. The higher order control points form an integral part of the net and serve as a source for datum definition. The relative positions of the points in the net are independent of the higher order control points and are determined by the measurements and their respective covariance matrix. The solution is equivalent to the orthogonal transformation of a minimum constraints solution of a net where the transformation parameters are determined by the control points and their a-priori covariance matrix.
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