STAR*NET V6 - Circe

Chapter 8 Analysis of Adjustment Output
The standard errors listed in the “Summary of Unadjusted Input Observations” section
just illustrated reflect the effects of several option settings. For example, if the
instrument or target centering error, set in the Project Options/Instrument settings, has a
non-zero value, the standard errors displayed for angles and distances will be inflated
from their input values, especially on short sights. Also, if distance or elevation
difference PPM values have been specified, the standard errors for distance or elevation
difference observations will be inflated to reflect the PPM component.
If you are running a 3D adjustment, the distance and zenith observations may be listed
with special flags to indicate which data types and correction options are in effect for
each data line. For example, if you enter “Inline Options” that allow you to mix slope
distances and horizontal distances, or turn the curvature and refraction off and on, you
will be able to easily verify the data types used and which correction types have been set
by reviewing these flags.
1. For distances, the “S” and “H” flags indicate whether the distance observation was
entered as a “slope” value or an a “horizontal” value.
2. For zenith angles, an “*” following the zenith observation value indicates that it had
been “precorrected” by the user for both earth curvature and refraction.
The following illustrates the appearance of these flags:
Number of Distance Observations (FeetUS) = 31
From To Distance StdErr HI HT Type
121 2 2382.1342 0.0345 5.000 5.782 S
121 19 2699.1143 0.0349 5.000 5.955 S
121 4 3213.6255 0.0452 5.500 5.650 S
132 88 3523.5332 0.0425 0.000 0.000 H
Number of Zenith Observations (DMS) = 31
(Zeniths Marked (*) are Precorrected for Curvature & Refraction)
From To Zenith StdErr HI HT
121 2 113-00-51.00 10.00 5.000 5.782
121 19 103-21-43.50* 10.00 5.000 5.223
121 4 114-15-27.25 10.00 5.000 4.850
Data Flags for 3D Observations
If you use the “.REFRACTION” inline option to change the “Refraction Coefficient” in
the data file, an additional column will display in the listing of zenith angles indicating
the refraction constant internally applied to each zenith observation during the
adjustment processing.
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