STAR*NET V6 - Circe

1. Open the “Net2D.prj” example project.
Appendix A STAR*NET Tutorial
2. Choose Input>Data Files, or press the Data Files tool button to open the Data Files
dialog. Then press “View” to view the “Net2D.dat” example data file.
Note that the Measure lines contain horizontal angle and distance observations from
one station to another. Usually, the standard errors for observations default to
Instrument setting values defined in the Project Options as discussed in the last
example. However, for illustration purposes, explicit standard errors have been
added to one of the data lines in this example. Press “OK” to exit the dialog.
3. Run the adjustment, by choosing Run>Adjust Network, or by pressing the Run
Adjustment tool button.
4. Choose Output>Plot or press the Network Plot tool button to view the network
graphically. Experiment by resizing the plot window larger and smaller by dragging
the corners or edge of the plot window.
5. Zoom into a section of the plot by dragging your mouse around some part of the
network. For example, drag a zoom box around just points 1 and 2. Note the status
information at the bottom of the plot window. The North and East coordinates are
shown for the location of the mouse pointer as you move it around the plot. The
Width value shown is the width of the plot window in ground units, FeetUS in this
example. This width value will give you a good sense of scale when you are zoomed
way into a very dense plot. Zoom out by pressing the Zoom All button.
Right-click anywhere on the plot to bring up the “Quick Change” menu. Click the
“Show Relative Ellipses” item to make relative ellipses display. These ellipses
represent the relative confidences in azimuth and distance between connections in
the network. Double click any line and to see its adjusted azimuth and distance
values plus its relative ellipse dimensions. Likewise, double click any point to see its
adjusted coordinates and ellipse dimensions. See Chapter 8, “Analysis of Adjustment
Output” for an extensive discussion of error ellipse interpretation.
6. View the Listing File by choosing Output>Listing, or by pressing the Listing tool
button. Review the various parts of the listing in the same way you did for the last
example. Be sure to review the “Statistical Summary” section which indicates how
well each group of observation types fit into the adjusted network.
Likewise, you should always review the “Adjusted Observations and Residuals”
section which shows how much STAR*NET had to change your observations. You
would normally examine this list carefully, especially if the adjustment fails the Chi
Square test, to look for possible problems with your data.
7. This completes the review of the “Net2D” example project.
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