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As per Regulation of the Czech Mining Of fice Board No. 435/1992 of Law Digest, as amended, there is a duty to survey any and all mine workings in the national reference system of S-JTSK type. The objective of both connecting and orientation surveys on the earth surface is to identify the end poi nt position for the plummet segment and especially to identify their bearing. Connec ting the horizon in the mine plays a role in transferring the coordinate values from the said plummet segment to the points ensuring the...