Horizontal Distance Measurement
Using tape to measure plan distances
The standard instrument used for measuring horizontal distances is
the Steel Tape. A Constant Tension Handle is usually applied as well. Since
both ends of the tape need to be firmly and accurately held, taping is
usually a two man operation.
Basic Measurement between 2 points
- Locate the two points. Make sure your tape is long enough to
reach between them.
- At the zero end of the tape, it is easier to hold the tape with 1m
at the first point rather than zero. This is generally referred to as
"one metre on". This end of the tape should be held firmly against the
- Ensure that the tape is not kinked or twisted, and is in a staright
- Using the constant tension handle, pull the tape taut at the second
point. read off the distance on the tape, but don't forget to subtract
the extra metre. Note this in the record, ie. " xxxxx - 1", to remind
yourself that the correction has already been applied.
- Always measure the distance independantly at leats twice.
Whilst the basics of measuring a distance with a tape are very
simple, there are a number of correction factors that can be taken into
|Corrected Distance =|
|Measured distance + (1) + (2) + (3) + (4) + (5), |
Where (1) to (5) are:-
- Slope Correction
- Tension Correction
- Temperature Correction
- Sag/Catenary Correction
For accuracies of 1:5000 to 1:10000 you need only apply (1) and (2).
For 1:10000 to 1:20000 apply (1), (2), (3), and (4).
accuracy greater than 1:20000 use all 5 corrections.
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