STAR*NET V6 - Circe

Chapter 5 Preparing Input Data
5.6 Description of Data Format and Content
This section describes each STAR*NET input data type, and gives examples of complete
data input lines. The descriptions are broken down into seven data type sections : (1)
Coordinate, Position and Elevation data types; (2) Single Observation data types; (3)
Multiple Observation data types; (4) Traverse data type; (5) Direction Sets data type; (6)
Leveling data type, and the (7) Sideshot data type. Note that in the format description of
each type, elements enclosed in square brackets, [ ], are optional.
All data lines allow the entry of descriptors, therefore the descriptor is not mentioned in
the boxes below that describe the formats of the individual lines. Descriptors are always
optional, and if entered on a data line, must be the last item on the line. Many of the
examples show descriptors.
COORDINATE, POSITION & ELEVATION DATA TYPES
The “C” Code: Coordinates for a Station
Format for 2D data:
C Station North East [Std Errors]
Format for 3D data:
C Station North East Elevation [Std Errors]
By default, STAR*NET expects coordinate data in 2D format for a 2D adjustment, and
3D format for a 3D adjustment. In some cases, you can enter 3D coordinates into a 2D
adjustment, or 2D coordinates into a 3D adjustment using the “.2D” and “.3D” inline
options. Coordinates can be entered in “NE” or “EN” order depending on your setting in
the Project Options/General dialog. You can change the input order of the coordinates
within the data using the inline “.ORDER” option See “Using Inline Options” later in
this chapter for details on the use of these options.
Coordinates are normally entered as completely fixed so they won’t be adjusted, or as
completely free to be adjusted. However at times you may wish to enter coordinate
values with specified standard error values so that the coordinates are not considered
completely fixed, and will be allowed some movement. These entered standard errors
might be standard deviations resulting of some previous adjustment, or possibly standard
deviations supplied along with some GPS points provided by others. In all cases,
standard errors are entered in the same “order” as the coordinates.
Any coordinate component entered with a standard error is considered an observation
just like any entered angle or distance. This “partially fixed” component (Northing,
Easting or Elevation) will be counted in the statistics and will show up as an observation
in the “Adjusted Observations and Residuals” section of the Listing file.
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