STAR*NET V6 - Circe

Chapter 5 Preparing Input Data
5.8 Entering 3D Data in a 2D Adjustment
STAR*NET allows you to enter 3D formatted data into a 2D adjustment. Your 3D data
will be reduced automatically to 2D, and the adjustment will be processed as if you had
manually reduced the data before entering it into the data file.
When the “Adjustment Type” in the Project Options/Adjustment dialog is set to 2D, the
program expects to find data in 2D format. However, to instruct the program to read data
entered in 3D format, you must precede any group of 3D data lines with the “.3D” inline
option. This tells STAR*NET what sort of data to expect, and allows for proper checking
and reduction to horizontal. If you switch back to 2D data format, precede those lines
with the “.2D” inline option.
3D data containing slope distances must be in the form of lines that include both the
distance and zenith so that STAR*NET can reduce the slope distance to horizontal. This
data can be in the form of M, BM, DM, DV or T data lines. A slope distance entered as a
single observation using the “D” line can not be included within a “.3D” section of data
since the program has no way to reduce it. However, a horizontal distance (with DELTA
mode on) may be included in any form within a “.3D” section of data. Any vertical
information on that data line is simply ignored.
The following data prepared for a 2D adjustment includes a section of 3D formatted lines
that will be reduced automatically to horizontal when read in by the program.
#Entering both 3D data and 2D data in a 2D adjustment
C 1 12135.223 13111.435 ! !
C 2 13324.665 15245.223 ! !
D 2-1 1327.34
M 2-1-3 134-45-12 2244.348
D 3-2 2244.341
M 3-2-4 144-12-56 3325.028
.3D #Change to 3D data format
DV 4-3 3325.123 90-22-34 #reduce to horizontal
M 4-3-5 287-44-53 2554.242 90-55-44
DV 5-4 2554.247 89-04-15
M 5-4-6 166-55-34 5594.110 91-12-33
.DELTA ON
DV 6-5 5592.751 118.312 #use the horizontal
M 6-5-7 172-21-47 4437.993 -66.345
.2D #Change back to 2D data format
M 7-6-12 128-55-12 1022.143
M 7-6-23 98-23-11 3255.445
Sample Data using “.2D” and “.3D” Inline Options
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