Steps in carrying out Triangulation
work – How to do triangulation

1. Reconaissance
2. Erection of
   Signals & Towers
3. Measurement of
   Horizontal Angles
4. Astronomical
   Observations Necessary to Determine the True Meridian and the Absolute
   Positions of the Stations
5. Measurement of
   Baseline
6. Adjustment of
   observed Angles
7. Computations
   of Legths of each side of each 
8. Computations
   of the Latitude and Longitude of ST

1.
Reconaissance:

1. Examination of
   the country to be surveyed.
2. Selection of
   most favorable sides for base lines
3. Selection of
   suitable positions of  station
4. Determination
   of indivisibility of station

2.
Selection of Station:

1. The stations
   should be clearly visible from each other. For this purpose highest
   commanding positions such as top of hills or mountains is selected.
2. They should
   form well shaped triangles
3. They should be
   easily accessible
4. They should be
   useful for detail survey
5. Thy should be
   so fixed that the length of sight is not too short or too long

3.
Intervisibility and Hights of Stations:

1. 
   
   Distance between the stations
2. Relative
   elevations of stations
3. The profile of
   intervening ground

3. 1. Distance between
stations:

If the intervening ground is free any obstruction, the distance
of a visible horizon form a station of known elves above datum as well as the
elves of the signal while may be just visible at a given distance can be
determine from the formula. 

3. 2. Relative elevations of
stations:

  Or 

3. 3. Profile of intervening ground:

Procedure: