STAR*NET V6 - Circe

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Appendix A STAR*NET Tutorial Example 2: Combined Triangulation/Trilateration 2D Network This example illustrates the adjustment of a simple triangulation-trilateration network. In the sample data file, many data lines are entered using the “M” code, the most commonly used data type meaning all “measurements” to another station. All the remaining independent observation are entered on a single “A” and “D” data lines. # Combined Triangulation-Trilateration 2D Network # C 1 5102.502 5793.197 ! ! C 3 7294.498 6940.221 ! ! C # 2 5642 7017 # Angle and Distance Observations at Perimeter M 2-1-3 111-08-11 1653.87 M 2-1-6 77-24-52 1124.25 M 3-2-4 87-07-04 1364.40 M 3-2-6 40-58-15 951.92 4.0 .03 M 4-3-5 120-26-52 1382.49 M 4-3-6 44-14-21 983.86 M 5-4-1 110-34-04 1130.75 M 5-4-6 39-46-29 1493.54 M 1-5-2 110-43-40 1337.89 M # 1-5-6 65-36-54 1548.61 # Angles at Center Point A 6-5-4 64-01-01 A 6-4-3 89-36-55 A 6-3-2 105-18-27 A 6-2-1 57-28-12 # # Distance Cross-ties 4 D D 1-4 2-5 2070.76 2034.47 120° 44° 90° 5 1 3 8 2 .4 9 40° 111° 1 1 3 0 .7 5 2 0 7 0 .7 6 66° 174 9 8 3 .8 6 1 4 9 3 .5 4 1 64° 111° 1 3 6 4 .4 0 44° 1 5 4 8 .6 1 2 0 3 4 .4 7 6 57° 1 3 3 7 .8 9 9 5 1 .9 2 105° 1 1 2 4 .2 5 77° 87° 41° 111° 1 6 5 3 .8 7 3 2
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. 175
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STAR*NET V6 Least Squares Survey Ad
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TABLE OF CONTENTS Chapter 1 OVERVIE
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10.9 Entering a Geoid Height and Ve
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Chapter 1 Overview 4. Survey planni
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Chapter 2 Installation 2.3 Starting
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2.7 The Registry Chapter 2 Installa
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3.3 The Menu System Chapter 3 Using
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3.8 Checking the Error File Chapter
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Chapter 3 Using STAR*NET 3.12 Displ
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Chapter 4 Options 4.2 Changing Proj
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Option Group: Units Chapter 4 Optio
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General Options Chapter 4 Options T
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Chapter 4 Options Option Group: Dis
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Chapter 4 Options What standard err
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Chapter 4 Options The default metho
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Option Group: Adjusted Contents Cha
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Other Files Options Chapter 4 Optio
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Chapter 4 Options Creating a Ground
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Special Options Chapter 4 Options T
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4.5 Company Options Chapter 4 Optio
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Chapter 4 Options Note that any dat
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Chapter 4 Options When the Instrume
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Using the Input Data Files Dialog C
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Chapter 5 Preparing Input Data 5.5
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Station Names Chapter 5 Preparing I
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Chapter 5 Preparing Input Data Zeni
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Point Descriptors Chapter 5 Prepari
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Example 1: (2D Data) Chapter 5 Prep
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Chapter 5 Preparing Input Data The
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Chapter 5 Preparing Input Data SING
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The “V” Code: Vertical Observat
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Chapter 5 Preparing Input Data Samp
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Example 2: (2D Data) Chapter 5 Prep
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Chapter 5 Preparing Input Data TRAV
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Chapter 5 Preparing Input Data Exam
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The “TE” Code: Ending a Travers
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Chapter 5 Preparing Input Data LEVE
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Chapter 5 Preparing Input Data SIDE
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Chapter 5 Preparing Input Data Usin
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INLINE OPTION: .DELTA ON/OFF Chapte
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INLINE OPTION: .SCALE Value Chapter
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Chapter 5 Preparing Input Data INLI
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Chapter 5 Preparing Input Data Lega
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How do I weight observations? Chapt
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Chapter 6 Running Adjustments The S
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6.5 Preanalysis Chapter 6 Running A
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Chapter 6 Running Adjustments 108
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Chapter 7 Viewing and Printing Outp
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7.4 Viewing the Error File Chapter
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Chapter 8 Analysis of Adjustment Ou
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Page 210 and 211: Index Installation Installing, 3 Se
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STAR*NET V6 - Circe

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