STAR*NET V6 - Circe

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Example 7: Preanalysis Appendix A STAR*NET Tutorial This example demonstrates using STAR*NET in the preanalysis of a planned survey network. Preanalysis means that the network will be solved using approximate coordinates to locate the stations, and a list of observations to indicate which distances and angles are planned to be observed. No actual field data are required. STAR*NET will analyze the geometric strength of the network using the approximate layout and the instrument accuracies supplied as observation standard errors. The predicted accuracy of each station will be computed and error ellipses will be generated. Preanalysis is a powerful tool that will help you to test various network configurations before any field work is done or to test the value of adding measurements to an existing network. You can use any of the 2D and 3D data types provided in STAR*NET to define a proposed survey. In this simple 2D example, we traverse around the perimeter, use measure lines to define some cross ties, and then fill in some angles. # Preanalysis # C 1 51160 52640 ! ! C 2 50935 52530 C 3 50630 53660 C 1001 51160 52950 C 1002 51145 53280 C 1003 50645 53265 C 1004 50915 53570 C 1005 50655 52770 C 1006 50945 52820 C 1007 50865 53160 # B 1-2 ? ! #B 1003-3 ? 5.0 # Uncomment this line to add another bearing # TB 2 T 1 T 1001 T 1002 T 1004 T 3 T 1003 T 1007 T 1006 T 1005 T 2 TE 1 # M 1-2-1005 M 1-2-1006 M 1001-1-1006 M 1001-1-1007 2 M 1002-1001-1007 M 1002-1001-1003 M 1004-1002-1003 A 1003-1007-1002 A 1003-1007-1004 A 1007-1006-1001 A 1007-1006-1002 A 1006-1005-1 A 1006-1005-1001 A 1005-2-1 1 1005 1006 1001 186 1007 1003 1002 1004 3
Appendix A STAR*NET Tutorial 1. Open the “Preanalysis.prj” example project. This is a “2D” project. 2. View the input data file. Note that all stations have been given approximate coordinates. This defines the network geometry. Also note that the list of distance and angle data lines contains no field observations. Observation standard errors default to the values set for the various data types in the Project Options/Instrument dialog. If a specific standard error is required, a place holder “?” is required on the data line in place of the actual observation. 3. Run the preanalysis by choosing Run>Preanalysis. Note that if you were to make any other choice from the Run menu such as “Adjust Network” or “Data Check Only,” errors would result due to the missing observations. 4. View the network graphically. Note that the resulting station error ellipses are larger for the stations furthest from the fixed station. Also, their shape and orientation suggest an azimuth deficiency in the network. This is the purpose of running a preanalysis, to study the strength of your planned survey network using only proposed field observations. 5. If you wish, you can experiment with adding another observation to the network. Open the Data Files dialog by choosing Input>Data Files, or by pressing the Input Data Files tool button. Press the “Edit” button, or double-click the highlighted data file name in the list. Locate the line in the data file that has a Bearing from Station 1003 to Station 3. Uncomment the line by deleting the “#” symbol at the beginning of the line, just before the “B” code. Note that this data line has an explicitly entered standard error of 5 seconds. (This new data, for example, might represent an observed solar azimuth.) Save the file and exit from the text editor. Now rerun the preanalysis by choosing Run>Preanalysis again. Review the new results graphically as described in Step 4 above. Notice the increased positional confidence provided by the addition of the proposed bearing observation. The ellipses we were concerned with are now smaller and more round. If you wish to see the actual ellipse dimensions, double-click any point on the plot. Or of course you can view the error ellipse information in the listing file as suggested below. 6. Take a quick look through the listing. Even though no actual observations were provided as input, observation values (angles and distances) will be shown in the listing. These values are inversed from the given coordinates and standard errors are assigned to these proposed observations from the Project Options/Instrument dialog settings. And of course, station ellipses and relative ellipses are also shown, their computed values being the main purpose for making a preanalysis run. 7. This completes the review of the “Preanalysis” project, the last example project in this tour of the STAR*NET program. 187
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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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