StarNet v6 manual - Engineering Surveyor

Option Group: Error Propagation
Chapter 4 Options
Here you indicate whether or not to perform error propagation, and what confidence
level to use. Error propagation is a separate function from the adjustment and it
calculates standard deviations for all the coordinates. It also calculates error ellipse
information for all network station coordinates and relative error ellipse information
between station pairs.
For large networks, the processing time for error propagation can become significant.
Therefore when working with large jobs, you may want to temporarily turn off error
propagation until the adjustment is debugged and working to your satisfaction.
The most commonly used confidence level is 95%. You can enter confidence level
values from 50% up to 99.999% depending on your project requirements.
Option Group: Input/Output Coordinate Order
These settings allow you to define the North/East order to be used for coordinates in the
data files and in the resulting output listing file. In addition, you can define how they
should be labeled. For example, certain international regions prefer to enter and list
coordinates in East/North order, and label them as X and Y.
An inline “.ORDER” option may be used anywhere in data files to change the default
order of coordinates being entered.
Option Group: Longitude Sign Convention
In grid jobs, this setting controls the meaning of the sign of longitude values for both
input data and computed output. The use of “positive” west longitudes (those west of
Greenwich) is the convention preferred by most users in the USA and Canada. The use
of “negative” west longitudes is usually preferred by the international community. Select
your preference, and that convention will be used for all grid systems, NAD27/83, UTM
and Custom. For example, if you are a user in the United States and have the option set
to the positive west convention, you can switch between NAD83 and UTM, and continue
to input the same positive longitudes and see positive longitudes in your results.
An inline “.LONGITUDE” option may be used anywhere in data files to change the
default sign convention of longitude values being entered.
Option Group: Angle Data Station Order
This option gives the order (At-From-To or From-At-To) of the stations that define
angles in the input data for your project. The output listing will also display the angles
using this station order.
An inline “.ORDER” option may be used anywhere in data files to change the default
station order of angles being entered.
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