STAR*NET V6 - Circe

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Chapter 5 Preparing Input Data 5.9 Entering 2D Data in a 3D Adjustment As discussed in the previous section, <strong>STAR*NET</strong> allows you to enter 3D data into a 2D adjustment. The program simply reduces the 3D data down to 2D in that case. Entering 2D data into a 3D adjustment, however, is a much different situation. For a 3D adjustment to work, 3D coordinates must be either present or computable for all connected stations in the network! So, for any station in a 3D adjustment whose elevation is not fixed, there must be some 3D observation data present that will cause its elevation to be computed during the adjustment process. Therefore, 2D data of any kind may be entered into a 3D adjustment as long as elevations for all referenced network points are determinable in some fashion. When your Adjustment Type in the Project Options/Adjustment dialog is set to 3D, the program by default expects data in 3D format. However, to instruct the program to read data entered in a 2D format, you must precede any group of 2D data lines with the “.2D” inline code. If you switch back to 3D data lines, precede those lines with the “.3D” inline option to tell the program what to expect. The following data prepared for a 3D adjustment includes a section of 2D formatted data lines. Note that stations “45” and “46” have no other observations entered which will establish their elevations! For this data to actually solve in a 3D adjustment, either fixed elevations for these two points must be entered, or additional observations must be entered to define their elevations. #Entering 2D data in with a 3D adjustment # C 1 12135.223 13111.435 1000.0 ! ! ! C 2 13324.665 15245.223 1299.9 ! ! ! M 2-1-3 134-45-12 2244.348 91-22-54 5.1/5.2 M 3-1-4 144-12-56 3324.222 89-56-54 5.3/5.0 .2D #Change to 2D data format M 3-2-45 287-44-53 2554.242 M 5-4-46 166-55-34 5554.771 SS 5-4-88 76-45-22 943.342 .3D #Change back to 3D data format M 5-4-7 172-21-47 4437.993 90-55-32 5.6/5.2 M 5-4-23 98-23-11 3255.445 90-45-51 5.6/5.7 Sample Data using “.2D” and “.3D” Inline Options Note that “SS” sideshot data can be freely entered in a 3D adjustment in 2D format (or reduced from 3D to 2D format using the “.3REDUCE” inline). Sideshot points are computed after the adjustment is completed. An elevation value of “-99999” is published for any sideshot whose elevation is not determined. 96
Chapter 5 Preparing Input Data 5.10 Entering “Reference Elevations” in a 2D Project As described in the Chapter 4, “Options,” a “Project Elevation” is assigned to all points in 2D Local and Grid projects so that certain data reduction calculations, such as reducing slope distance and zenith observations to horizontal can be performed using curved earth geometry. In addition, for 2D “Local” jobs, an elevation needs to be known to perform calculations when the user chooses to have his data reduced to a given datum. Likewise, for 2D “Grid” jobs, an elevation is necessary to determine grid factors. In certain cases you may wish to assign more than a single project elevation to points in a 2D project so that the calculations mentioned above can be performed more accurately. There is an inline “.PELEVATION” described earlier in this chapter in Section 5.6, “Using Inline Options” that allows the default project elevation to be redefined for various parts of the project. You can also assign elevations to individual points in a 2D adjustment. Simply use any of the data types containing an “elevation” field to enter an elevation value. These values, used in the calculations mentioned above, are considered “reference” elevations and will list in the results as such. These elevations need not be entered as fixed. Fixity codes or required standard error placeholders entered for these values will be ignored. In the example data for a 2D project shown below, elevation values entered for specific points are assigned as their reference elevations. All other points in the network are assigned the current “Default Project Elevation” as their reference elevations. #Entering "Reference Elevations" in a 2D project C 1 12135.223 13111.435 ! ! C 2 13324.665 15245.223 ! ! .3D #Change to 3D data format to include elevation information C 21 13243.345 15344.547 875 ! ! & E 31 865 E 33 920 .2D #Change back to 2D data format M 2-1-3 134-45-12 2244.348 M 3-2-4 144-12-56 3325.028 Sample “2D” Project Using “Reference” Elevations Because the earth is curved, reductions to grid or to a given datum in a 2D job is only as accurate as the project elevation or individual reference elevations supplied by you. It is highly recommended that you run full 3D adjustments using complete 3D data to avoid any inaccuracies or approximations whenever possible. 97
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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
Page 52 and 53: Chapter 5 Preparing Input Data Zeni
Page 54 and 55: Point Descriptors Chapter 5 Prepari
Page 56 and 57: Example 1: (2D Data) Chapter 5 Prep
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Page 60 and 61: Chapter 5 Preparing Input Data SING
Page 62 and 63: The “V” Code: Vertical Observat
Page 64 and 65: Chapter 5 Preparing Input Data Samp
Page 66 and 67: Example 2: (2D Data) Chapter 5 Prep
Page 70 and 71: Chapter 5 Preparing Input Data TRAV
Page 72 and 73: Chapter 5 Preparing Input Data Exam
Page 74 and 75: The “TE” Code: Ending a Travers
Page 80 and 81: Chapter 5 Preparing Input Data LEVE
Page 82 and 83: Chapter 5 Preparing Input Data SIDE
Page 84 and 85: Chapter 5 Preparing Input Data Usin
Page 86 and 87: INLINE OPTION: .DELTA ON/OFF Chapte
Page 88 and 89: INLINE OPTION: .SCALE Value Chapter
Page 90 and 91: Chapter 5 Preparing Input Data INLI
Page 98 and 99: Chapter 5 Preparing Input Data Lega
Page 104 and 105: Chapter 5 Preparing Input Data 5.11
Page 106 and 107: How do I weight observations? Chapt
Page 108 and 109: Chapter 5 Preparing Input Data 102
Page 110 and 111: Chapter 6 Running Adjustments The S
Page 112 and 113: 6.5 Preanalysis Chapter 6 Running A
Page 114 and 115: Chapter 6 Running Adjustments 108
Page 116 and 117: Chapter 7 Viewing and Printing Outp
Page 118 and 119: 7.4 Viewing the Error File Chapter
Page 124 and 125: Chapter 8 Analysis of Adjustment Ou
Page 144 and 145: To run the utility, follow these st
Page 146 and 147: Chapter 9 Tools As discussed above,
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Page 150 and 151: Chapter 9 Tools The settings select
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Chapter 10 Adjustments in Grid Coor
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APPENDIX A - TOUR OF THE STAR*NET P
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Appendix A STAR*NET Tutorial Exampl
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Appendix A STAR*NET Tutorial 4. Rev
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Appendix A STAR*NET Tutorial 7. Fin
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Appendix A STAR*NET Tutorial 12. To
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Appendix A STAR*NET Tutorial Take a
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Appendix A STAR*NET Tutorial Before
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Example 5: Resection Appendix A STA
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Example 7: Preanalysis Appendix A S
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Appendix B References 6. Mikhail, E
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Appendix C Additional Technical Inf
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Appendix C Additional Technical Inf
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Appendix D Error and Warning Messag
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Data Lines, General Content Data Ty
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Index Installation Installing, 3 Se
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STARPLUS SOFTWARE, INC.
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STAR*NET V6 - Circe

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