PURPOSE AND PRINCIPLE OF COMPASS
1. Compass :Angle measuring instrument (Bearing)
2. Principle: The principle
of compass surveying is
traversing
3. Designation of compass
–
The size of the compass is expressed in terms of
its diameter
–
The compass 12 cms(120mm) means the diameter
of box is 12 cms(120mm)
TRAVERSING:
1. It
is a series of connected lines.
2. Types
of traversing:-
(a) Open traverse : continuous lines, not returns
(b) Closed traverse : forms
closed circuit
Methods of traversing
1. Chain
traversing (by chain angle)
2. Compass
traversing (by free needle)
3. Theodolite traversing (by fast needle)
4. Plane
table surveying (by plane needle)
When is compass surveying
recommended?
Compass Survey
is recommended when
1. A
large area is to be surveyed
2. The
course of a river or coast line is to be surveyed
3. The
area is crowded with many details and triangulation is not possible
When is Compass surveying not
recommended ?
1. Where
local attraction is suspected due to magnetic material steel , iron &
electric cables
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