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Levelling

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Plane Surveying – Levelling
Civil Engineering 235 Introduction: Levelling is a means by which surveyors can determine the elevation of points, using other known points as references. Levelling is perhaps the most basic of surveying operations and forms an important fundamental part of almost every surveying project. Department of Civil Engineering, UBC

Equipment: Levelling is carried out by the use of: a Spirit Level, often called an Engineer’s Level, and a level rod. The level rod resembles a large fold-up ruler but is not accurately referred to as such.

Basics of Levelling: In levelling, the surveyor looks back (BS) to a point of known elevation to determine the elevation of his or her instrument (EI). The surveyor then looks forward (FS) to a point of unknown elevation and determines the elevation of that point using the elevation of his or her instrument (EI) and the value on the level rod read through the level’s telescope.

BS
1.600

EI = 81.600

FS
1.739

80.000 BM

79.861

Point A

Once the elevation of a point is determined, that point can be used for determining the elevations of other points. In this way, the surveyor may “leap-frog” forward, eventually determining the elevations of points that are impractical from the initial location, and developing greater accuracy by means of a “closed traverse”.

Page 1 of 8

Plane Surveying – Levelling
Civil Engineering 235 Department of Civil Engineering, UBC

A Sample Levelling Traverse:
FS BS

SII SIII

BS FS FS BM
2.861

IS

BS

IS

SI

79.099

IP

64

BS
1.600

EI = 81.600

BS FS
1.739 2.099

EI = 81.960

FS BS
1.610 1.274

EI = 81.624

FS
1.523

80.000 BM
27 36

80.350 79.861 TP1
31 30

TP2

80.101

BM

80.000

26

18

SI

SII

SIII

Page 2 of 8

Plane Surveying – Levelling
Civil Engineering 235 Sample Traverse

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