STAR*NET V6 - Circe

How do I weight observations?
Chapter 5 Preparing Input Data
1. For most data, you will want the default standard error values assigned that you have
set in the Project Options/Instrument dialog, or the default values set by your use of
the Instrument Library facility and an “.INSTRUMENT” inline option. To use the
current default standard error values for all observations on a data line, simply leave
the entire standard error field blank.
M 3-2-4 125-30-20 595.25
2. If you want an observation to be free in the adjustment, and have no influence, use
the “*” symbol. Or to inherit the current default weight, use the “&” symbol. For
example, in a 2D formatted measure line, you could free the angle observation and
leave the distance weight the same as the current default by entering the following
data. Remember that you must enter all standard error values (or symbols) for
observations on a data line, or none.
M 3-2-4 125-30-20 595.25 * &
In this case, the angle will have no weight or influence in the network adjustment
and it will not be counted in the statistical summary. A residual, however, will be
displayed in the adjusted angles section of the output listing.
3. If you want an observation to be fixed in the adjustment, use the “!” symbol. For
example, the following line fixes the bearing between “tower” and “p1”.
B tower-p1 N45-30-31.02 !
Be careful when fixing observations. If you were to fix the coordinates of two points,
and then fix the distance between them at some slightly incorrect value, you will
likely get an adjustment that cannot converge. STAR*NET cannot resolve such
inconsistencies in your data.
4. If you want to use an actual standard error, enter the actual numerical value. For
angular measurements, enter the standard error in seconds when DMS units are being
used, or in milligons (GON/1000) when GONS are being used. The following line
gives angle P1-P2-P3 a standard error of 12.5 seconds. Remember that explicitly
entered standard errors are used exactly as given and are not inflated by centering
errors unless the “.ADDCENTERING ON” inline option is used.
A P1-P2-P3 23-21-13.6 12.5
The values you use for standard errors might be obtained from the specifications of
instrument manufacturers, past experience, or the results of a preceding computation.
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