Home > Survey Mode > Reductions > Traverse > Fieldbook > New Field Book
Open a new, blank spreadsheet for Traverse data.
Traverse data can be typed directly into the spreadsheet. Each line of the spreadsheet represents a set-up station, an outward orienting ray, an oriented traverse observation or an unoriented traverse observation. Traverse observations can either be an EDM or prism observation or a tache or staff 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. Set-up stations require in addition an instrument height. Outward orienting rays require in addition a horizontal angle reading. EDM or Tache observations require in addition horizontal angle readings, vertical angle readings, a distance and a target height (stadia or prism).
Permissible field book indicator codes are:
{ - Setup station
% - Outward orienting ray
o - Oriented traverse observation
u - Unoriented traverse observation
The order of the data fields is:
Indicator
Setup or target point name
Horizontal Circle Left
Horizontal Circle Right (optional)
Distance (Sloped or horizontal)
Vertical Circle Left (Not applicable to flat traverses except for heighting)
Vertical Circle Right (optional)
Instrument or Target height (optional except for heighting)
An example of a field book is given below:
{,T236,0.0000,0.0000,0.000,0.0000,0.0000,1.570
o,U17,354.3049,174.3043,98.259,93.4246,266.1723,1.590
%,T71,202.3705,22.3701,0.000,0.0000,0.0000,0.000
{,U17,0.0000,0.0000,0.000,0.0000,0.0000,1.570
u,T236,174.3048,354.3051,0.000,86.1746,273.4200,0.300
u,U21,202.3505,22.3502,673.194,89.2136,270.3808,1.536
%,WT,207.0102,27.0106,0.000,0.0000,0.0000,0.000
The first line is a set-up station called 'T236' and the instrument height is 1.570.
The second line is an oriented reading to the next set-up station called 'U17'.
The third line is an orientation ray to an outside point called 'T71'.
The fourth line is a set-up at the next station ('U17').
The fifth line is an unoriented back observation to 'T236'.
The sixth line is an unoriented forward observation to 'U21'.
The last line is orientation ray to 'WT'.
Several orientation rays are acceptable. The weighted mean correction is presented as the default but you can override this.
The order of the observations at a set-up station is immaterial, while the order of the traverse is dictated by the sequence of the set-up stations in the ASCII file.
If both Circle Left and Circle Right observations are entered, the mean of the two is used in the reduction of the traverse.
Distances can be observed in either direction. If both are present, a mean is taken.
It is not vital that every traverse point has observations from it. In other words, not every station has to be occupied. This applies to both the first and last points as well. However, if a station is not occupied, the one after it must have some outside orientation or the traverse cannot be reduced. Also, even if stations are not occupied, they still need to be specified in the traverse spreadsheet with a '{' code.