STAR*NET V6 - Circe

Chapter 5 Preparing Input Data
SIDESHOT DATA TYPE
The Sideshot data type allows you to add unlimited sideshots to your data without
affecting processing of the network stations from which they were observed. The format
is the same as the “Measure” line except that standard error values are not entered.
Sideshots are diverted during loading of the input data file, and are not processed until
after the network is adjusted. Because they are processed after the adjustment is finished,
they do not affect the adjustment results. No error propagation is performed on sideshots.
The sideshot data type is included so that you can process a network containing hundreds
or thousands of sideshots without slowing down the network adjustment. This approach
lends itself to the processing of large data sets downloaded from data collectors.
You cannot occupy a sideshot point or backsight to a sideshot! Only main network
stations may be occupied or used as backsights! Multiple sideshots to the same point are
not adjusted – you will get multiple sets of coordinates published for that point.
Note that a sideshot station name may have the same name as a network station or any
other sideshot. However, you can instruct STAR*NET to check these sideshot names
against network station names and/or against other sideshot names and issue warning or
error messages if repeated names are found. See “Special Options” on page 33 for setting
of these sideshot name checking options.
The “SS” Code: Sideshot (All Observations to a Sideshot Point)
Format for 2D Data:
SS At-From-To Angle Distance
Formats for 3D Data - Depending on the “Distance/Vertical Data Type” mode:
SS At-From-To Angle Slope Distance Zenith [HI/HT]
SS At-From-To Angle Horiz Distance Elev Diff [HI/HT]
Example: (3D Data with Slope Distance and Zenith Angle)
SS A33-A4-72 153-21-44 874.5 91-22-54 5.25/5.90 ‘Lone Pine
The data above is a 3D sideshot. With the instrument at A33, backsighting to A4, a shot
was made to station 72 reading an angle of 153-21-44, a slope distance of 874.5 and a
zenith angle of 91-22-54. An HI/HT entry and a point descriptor are included.
76