OPTC Edavanna Page 1 MODULE II : Compass surveying 1. Explain the concept of traverse? What is closed and open traverse? Traversing is the type of survey in which a number of connected survey lines forms the frame work. The directions and length of survey lines are measured using suitable instruments. 2. Define compass surveying? Compass surveying is the type of surveying in which the direction of the survey lines are measured with a compass and the length of the survey lines are measured with a tape or chain in the field. 3. Write the names of the instruments used in compass surveying? (i) Instruments for the direct measurement of directions: a) Surveyor’s compass b) Prismatic compass. (ii) Instruments for the measurement of angles: a) Sextant b) Theodolite 4. What is mean by bearing? Bearing is the horizontal angle between the meridian and one of the extremities of line. They are of three types 1. True bearing 2. Magnetic bearing 3. Arbitrary bearing 5. What is mean by fore bearing and back bearing? Fore bearing: If the bearing of line AB is measured from A towards B (direction of the progress) Back bearing: If the bearing of line AB is measured from B towards A Closed traverse: Survey lines forms a closed figure or circuit. Orphanage Polytechnic College, Edavanna REVISION PACKAGE Surveying - I ( Revision 2015) Open traverse: Survey lines forms an open figure. eg: canal, roads, etc
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OPTC Edavanna Page 1
MODULE II : Compass surveying
1. Explain the concept of traverse? What is closed and open traverse?
Traversing is the type of survey in which a number of connected survey lines forms
the frame work. The directions and length of survey lines are measured using
suitable instruments.
2. Define compass surveying?
Compass surveying is the type of surveying in which the direction of the survey
lines are measured with a compass and the length of the survey lines are measured
with a tape or chain in the field.
3. Write the names of the instruments used in compass surveying?
(i) Instruments for the direct measurement of directions:
a) Surveyor’s compass
b) Prismatic compass.
(ii) Instruments for the measurement of angles:
a) Sextant
b) Theodolite 4. What is mean by bearing?
Bearing is the horizontal angle between the meridian and one of the extremities of
line. They are of three types
1. True bearing
2. Magnetic bearing
3. Arbitrary bearing
5. What is mean by fore bearing and back bearing?
Fore bearing: If the bearing of line AB is measured from A towards B
(direction of the progress)
Back bearing: If the bearing of line AB is measured