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To adjust the survey results of multi‐row networks the Gauss–Markov model can be used, including accuracy weight matrix for the values observed, as well as in‐ cluding the apparent observational equations for the coordinates of tie points. To the apparent observational equations the relevant accuracy weights are assigned for the analysed coordinate points or their covariance matrices. Many authors of scientific papers use for that purpose the sequential adjustment of measurement results, i.e. the adjustment carried out in a few stages. By foreign authors, there are the works of Baardy [2], Teunissen [14] and Rao [13]. By domestic authors, there are the pa‐ pers of Adamczewski [1], Baran [3], Gaździcki [7], Kadaj [8], Wiśniewski [15] and Kaminski [9]. Many computer programmes, e.g. GOENET [8], use this procedure to adjust measurement results of the multirow control networks. The issue of the estimation of the horizontal and vertical control point coordi‐ nates in tying to national geodetic control networks is similar to multirow networks adjustment but specific allocation of these networks set down different conditions of tying them to national geodetic control networks. This problem, in relation to determination of point displacement, was worked on in Canada by Chrzanowski [4] and in Germany by Pelzer [10]. Similar deliberations were made nationally by Cza‐ ja [6] and Proszynski and Kwaśniak [12]. The deliberations included in this pub‐ lication will only be referred to three thematically nearest positions, i.e. Czaja [5], Proszynski [11] and Wiśniewski [16]. In paper [5] the author proposes to include the observations of connecting national geodetic control network points to the adjuste‐ ment of horizontal and vertical control network. For the coordinates of national ge‐ odetic control points the author proposes to juxtapose the pseudo‐observation equa‐ tions including their ccovariance matrices. Proszynski [11] in his paper presents the method of tying the horizontal and vertical control networks to the national geodetic

Accuracy standards of tying the horizontal and vertical control network to the National Geodetic Control Network.