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In surveying, tape correction(s) refer(s) to correcting measurements for the effect of temperature and tension, catenary and to reduce measurement on the slope to the equivalent horizontal length. Not correcting for these effects gives rise to systematic errors as the effects act in a predictable manner which can be corrected by mathematical methods. ==Correction due to incorrect tape length== Manufacturers of measuring tapes do not usually guarantee the exact length of tapes, and standardization is a process where a standard temperature and tension are determined at which the tape is the exact length. The nominal length of tapes can be affected by physical imperfections, stretching or wear. Constant use of tapes cause wear, tapes can become kinked and may be improperly repaired when breaks occur. The correction due to tape length is given by: : Where: :CL is the corrected length of the line to be measured or laid out; :ML is the measured length or length to be laid out; :NL is the nominal length of the tape as specified by its mark; :Corr is the Note that incorrect tape length introduces a systematic error that must be calibrated periodically. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tape correction (surveying)」の詳細全文を読む スポンサード リンク
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