Title CEP233 - M5 - Taping Corrections.pdf ✅

1 of 23 CEP233 | FUNDAMENTALS OF SURVEYING MEASUREMENT OF HORIZONTAL DISTANCES MODULE 5 TAPING CORRECTIONS This module provides a deep analysis in the provisions of proper taping corrections. These corrections are due to incorrect tape length, slope, alignment, temperature, tension, sag, wind, normal tension, and combined corrections. Objectives • To understand the proper application of corrections to incorrect taping practices. 5.1 Introduction Taping operations could either be of the following: taping to determine an unknown length or taping for the purpose of laying out a required or specified length. Regardless of which of these two categories is involved, there are some corrections which are applied to the original measurements to determine the correct and more accurate length. 1st Rule: When a line is measured with a tape that is “too long”, the corrections are applied to the observed length by adding. 2nd Rule: When a specified or required length is to be laid out with a tape that is “too long”, the corrections are subtracted from the known length to determine the corrected length to be laid out. 3rd Rule: When measuring or laying out lengths with a tape that is “too short”, the corrections are applied opposite to those stated in the first two rules. Considering these three rules, the student should note carefully when a correction should be added or subtracted. This should be given an important consideration especially when the tape used proves to be in appreciable error from the standard. During the process of measurement with a tape which is too long, a large enough value could not be obtained such that a positive correction is made. This means that if the tape is too long, it will take fewer tape lengths to measure a distance than would be required for a shorter but correct length of tape. These three rules could be easily remembered by the following much shorter statement: “When measuring with tape too long, add; tape too short, subtract. Do the reverse when laying out.” CHAPTER 2