Home > Survey Mode > Reductions > Control Network > Fieldbook > New Field Book
Open a new, blank spreadsheet for Control Network data.
Control data can be typed directly into the spreadsheet. Each line of the spreadsheet represents a set-up station or a network observation.
Each type of entry has different requirements. All entries require at least a field book indicator code (see below) and a point name or descriptor. Network observations require any combination of horizontal angle readings, vertical angle readings and distances.
Permissible field book indicator codes are:
{ - Setup station
The order of the data fields is:
Indicator code
Setup or target point name
Horizontal Circle Left (for direction observations)
Horizontal Circle Right (optional)
Distance (Sloped or horizontal for distance observations)
Vertical Circle Left (only if the observed distance is sloped)
Vertical Circle Right (optional)
An example of a field book is given below:
{,T236,0.0000,0.0000,0.000,0.0000,0.0000
n,U17,354.3049,174.3043,98.259,93.4246,266.1723
n,T71,202.3705,22.3701,0.000,0.0000,0.0000
{,U17,0.0000,0.0000,0.000,0.0000,0.0000
n,T236,174.3048,354.3051,0.000,86.1746,273.4200
n,U21,202.3505,22.3502,673.194,89.2136,270.3808
n,WT,207.0102,27.0106,0.000,0.0000,0.0000
The first line is a set-up station called 'T236'.
The second line is a direction and slope distance observation to a point called 'U17'.
The third line is a direction reading to a (probably) fixed point called 'T71'.
The fourth line is a set-up at station 'U17'.
The fifth line is a redundant direction and slope distance observation to 'T236'.
The sixth line is a direction and slope distance observation to a point called 'U21'.
The last line is a direction reading to a (probably) fixed point called 'WT'.
The order of the observations at a set-up station is immaterial. The order of setups is also immaterial.
If both Circle Left and Circle Right observations are entered, the mean of the two is used in the adjustment of the network.
If vertical angles are present with a distance observation, it is assumed that the distance is a slope distance and the observed vertical angle, or the mean vertical angle if both circle left and circle right are present, is used to reduce the observed distance to the horizontal. Without vertical angles, the distance is assumed to be a horizontal distance.
It is not vital that every point has observations from it. In other words, not every point has to be occupied. This applies to both fixed and free points. However, if a point is not occupied, there must be redundant observations to it or the network cannot be reduced.