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STAR*NET V6 - Circe

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Chapter 5 Preparing Input Data<br />

INLINE OPTION: .CURVE ON/OFF (Default is ON)<br />

By default, <strong>STAR*NET</strong> assumes that all survey observations entered as data are normal<br />

measurements taken on the face of the earth. In all the calculations performed to<br />

determine “horizontal” distances, the effects of both earth curvature and refraction are<br />

taken into consideration. These calculations affect all 3D adjustments containing zenith<br />

angle observations and 2D adjustments where zenith angles are used to reduce slope<br />

distances to horizontal.<br />

If you have removed the effects of earth curvature and refraction by modifying your<br />

zenith angles by some method, you must tell <strong>STAR*NET</strong> so this will be taken into<br />

consideration during processing. Enter the “.CURVE OFF” inline option before any<br />

zenith angle observations that have been modified for earth curvature and refraction.<br />

M 52-51-53 133-23-55 95-30-22 #pure field observations<br />

M 53-52-54 97-44-31 96-11-56<br />

.CURVE OFF #hand-modified zenith angles<br />

M 78-74-75 120-27-56 94-26-34<br />

M 78-74-77 102-44-34 95-21-54<br />

M 77-78-79 84-54-33 89-53-42<br />

.CURVE ON #back to field observations<br />

M 65-62-94 112-22-33 234.27<br />

etc...<br />

And then be sure to return back to the default “.CURVE ON” mode when entering pure,<br />

unmodified field observations so <strong>STAR*NET</strong> will again consider standard curved earth<br />

geometry and refraction in its calculations.<br />

INLINE OPTION: .ADDCENTERING ON/OFF (Default is Off)<br />

By default, standard error values explicitly entered on data lines are used exactly as<br />

given. By default, they are not affected by any centering error values entered in your<br />

project options or instrument library. If you have a reason for wanting centering applied<br />

to explicitly entered standard errors, (or to cause weighting in your data files be handled<br />

exactly the same as in earlier versions which did apply centering to explicitly entered<br />

standard errors), you can use this inline option.<br />

M 2-1-3 45-33-44 1357.234 91-22-46 2 .03 9 5.4/5.6<br />

.ADDC ON<br />

M 2-1-4 88-11-22 1234.321 89-33-57 2 .03 9 5.4/5.6<br />

.ADDC OFF #Change back to normal<br />

For example, in the first data line above, the explicitly entered standard errors shown<br />

underlined will be by default used exactly as entered. In the second data line, the entered<br />

standard errors will be inflated by any centering error settings currently in effect.<br />

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