STAR*NET V6 - Circe

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Appendix A STAR*NET Tutorial Example 6: Traverse with Sideshots This example illustrates data consisting of a simple traverse containing many sideshots. Sideshots are diverted during loading of the input data file, and are not processed until after the network is adjusted. Their computed coordinates are written to both the Listing File and the Points File. Because they are processed after the adjustment, no error propagation is performed on Sideshots. The sideshot data type is available so that you can process a network containing hundreds or thousands of sideshots without slowing down the adjustment of the actual network. In particular, this approach lends itself to the processing of large topo data sets downloaded from data collectors. # Traverse with Sideshots # C 1 1000.00 1000.00 1440.28 ! ! ! C 2 1725.18 1274.36 1467.94 ! ! ! # # Begin Field Observations # TB 2 T 1 51-59-30 242.42 88-44-35 5.25/5.30 T 59 198-19-55 587.14 89-39-40 5.30/5.50 'IRON PIN T 572 140-52-34 668.50 80-14-25 5.18/5.22 TE 828 # # Begin Sideshots # SS 1-2-3 104-18-07 146.08 90-56-54 5.25/5.33 'TOE SS 1-2-4 24-33-33 118.64 89-16-07 5.25/5.33 'TOE SS 1-2-5 339-20-11 254.12 88-03-45 5.25/5.33 'FACE OF CURB SS 1-2-14 339-35-31 383.90 88-33-17 5.25/5.33 'TOE etc... 1 2 59 184 572 828
Appendix A STAR*NET Tutorial 1. Open the “Sideshots.prj” example project. 2. View the input data file. Note that the sideshots are entered with the “SS” code. Scroll down and view the entire file; the data includes quite a number of sideshots! Most of the sideshots also have a text descriptor at the end of the line, which is marked with a single or double quote character. Remember that the sideshots are processed after the adjustment, and do not slow down the network processing. It is also important to remember that since sideshots are not actually part of the “adjusted” network, you cannot occupy a sideshot or backsight to one. You cannot take additional sideshots to the same point and expect that point to be adjusted. In all these cases, you should enter your observations with an “M” data line which is included in the actual adjustment. For simplicity, sideshots in this example were all entered following the traverse. However they may be freely intermixed with traverse data or any other types of data, to preserve the same order recorded in your field book or data collector. 3. Run the adjustment. The adjustment of the traverse proceeds very quickly, and the sideshots are processed independently after the adjustment is completed. Note that in this particular example the main traverse is simply an open ended traverse that doesn’t even tie into a known station. So in this case, although all points are computed, nothing is really adjusted. This illustrates how STAR*NET can be used simply as a data reduction tool. Had we been working in some grid coordinate system, for example NAD83 or UTM, all the observations would have been also reduced to grid, producing adjusted grid coordinates. 4. View the resulting network graphically - many sideshots fill the plot screen. Zoom into a small group of sideshots. Right-click the plot screen to bring up the “Quick Change” menu, and click the “Show Sideshot Descriptors” item to turn on viewing of descriptors. Descriptors often clutter up a plot view, so by default you will usually leave them turned off. You can also turn sideshots entirely off and on in the “Quick Change” menu (or the “Plot Options” dialog) by unchecking and checking the “Show Sidehots” item. 5. Take a quick look at the adjustment listing file. Looking through the listing you will see a review of the input sideshot observation data as well as final sideshot coordinates in the “Sideshot Coordinates Computed After Adjustment” section. These computed sideshot coordinates, along with the traverse coordinates, also appear in the “points” output file created during the processing. This file can be viewed by choosing Output>Coordinates as illustrated in earlier examples. 6. This completes the review of the “Sideshots” example project. 185
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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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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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STAR*NET V6 - Circe

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