CLASSIFICATION OF
SURVEYS
Surveying may be classified in four different ways,they are disscussed as
under
1. CLASSIFICATION BASED
ON INSTRUMENTS USED:
a. CHAIN SURVEYING
1.
Simplest type of surveying
2.
Only linear measurements are taken with a chain or tape
3.
No angular measurements are taken
4.
Preferred when high accuracy is not required
1.
Horizontal angles are measured with the help of magnetic compass
taking bearings
2.
Linear measurements are also taken with chain or tape.
3.
More accurate than chain survey
c. PLANE TABLE SURVEYING
1.
A map is prepared in field while viewing the terrain and after
determining the
directions and lengths of lines
2.
Advantage is that taking measurements and plotting are done
simultaneously
3.
It is less accurate survey
2.
Extremely important in most of the Engineering works
1.
Traverse survey
2. Horizontal angles are
measured with theodolite
3.
Linear measurements are made with tape
1.
The lines form a system of triangles
2.
The base line is measured accurately and the lengths of all other
lines are computed from the angle
f.
TACHEOMETRY SURVEY
1.
Tacheometer is a special type of theodolite fitted
with stadia diaphragm
2.
By taking staff readings, distances can be calculated
g. PHOTOGRAMMETRY SURVEY
1.
Photogrammetry is a science of taking
measurements with the help of photographs
2.
Used for obtaining topographical details of areas which are
difficult to reach
h. E.D.M SURVEY
1.
Three sides of each triangle are measured accurately with
Electronic Distance
Measuring instruments
2.
Angles are computed indirectly from the known sides of the
triangles
CLASSIFICATION
BASED ON METHODS EMPLOYED
CLASSIFICATION BASED ON NATURE OF THE FIELD SURVEY
Measuring instruments
CLASSIFICATION BASED ON NATURE OF THE FIELD SURVEY
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