STAR*NET V6 - Circe

Chapter 5 Preparing Input Data
INLINE OPTION: .2D or .3D or .3REDUCE
When running a 2D adjustment, the program expects data in 2D format. Likewise, when
running a 3D adjustment, the program expects data in 3D format.
The “.2D” and “.3D” inline options allow mixing both 2D formatted and 3D formatted
data in both 2D and 3D adjustments.
#Data for a 3D job
M 1-2-5 55-44-66 345.128 89-11-43 5.4/5.6
.2D #Change data format mode to 2D
M 5-1-8 133-22-54 934.241
M 8-5-9 23-35-34 234.112
.3D #Change back to 3D data format
M 7-5-6 78-42-61 435.448 89-44-41 5.6/5.7
When using the “.2D” inline option to enter 2D sideshots in a 3D adjustment, elevation
values of -99999 are shown in the results to indicate they are undetermined.
The “.3REDUCE” inline option, just like the “.3D” option, specifies that following data
is in 3D format. But in addition, it causes the program to reduce all slope distances with
zeniths down to horizontal distances only.
Why would you want to do this? One likely reason might be that you have measured
some 3D observations and didn’t record the instrument and target heights, but you still
want to use the angles and reduced horizontal distance information in a 3D adjustment.
The “.3REDUCE” inline will do this for you.
.3R #Reduce the following to angles and horizontal distances
M 1-2-3 45-33-55 1357.234 91-22-33
M 1-2-5 55-44-66 345.128 89-11-43
.3D #Change back to normal 3D format mode
Don’t forget that in a 3D adjustment, any “network” station referenced in “reduced” data
must have other data in the adjustment which establishes its vertical location.
When 3D “sideshots” are entered under the “3R” mode, the observations are reduced to
2D just like with normal observations, but elevation values of -99999 are shown in the
results for the sideshot points to indicate they are undetermined.
The 2D, 3D and 3R options are exclusive modes. Entering one will turn another off.
See Section 5.8, “Entering 3D Data in a 2D Adjustment,” Section 5.9, “Entering 2D Data
in a 3D Adjustment” and Section 5.10, “Entering Reference Elevations in a 2D Project”
for more details on mixing 2D and 3D data in a single adjustment.
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