STAR*NET V6 - Circe

Chapter 5 Preparing Input Data
INLINE OPTION: .MAPMODE ON/OFF [ANGLECALC]
When this option is used in a data file, the “horizontal angle” field in traverse lines will
be read as a bearing or azimuth. The purpose of the option is to provide an easy way to
enter traverse information directly from a record map. Please note that bearings and
distances from a record map are not field observations and therefore, in general,
shouldn’t be combined with actual field observations in a network adjustment. (Record
map information has already been adjusted in one way or another.) However, for those
using STAR*NET as tool for readjusting and resolving maps for their GIS, this special
option can save time.
To use this option, simply enter “.MAP ON” before any traverses you wish to affect.
You cannot change the “MAPMODE” within a traverse. If you have other traverses later
on in your data that are entered using the default “horizontal angle” method, then be sure
to end this mode with the “.MAP OFF” option.
When this mode is on, the traverse “TB” line must not contain data, and the “TE” line
must contain only the ending station name. The short example below illustrates two
traverses entered with “MAPMODE” turned on:
.MAP ON #MAPMODE is turned on
TB #Traverse begins
T 101 N00-11-12E 255.32 #Bearing & distance map data
T 102 N89-35-27E 503.25
T 103 S00-44-56W 264.18 ! & #Bearing is fixed
T 104 N89-56-31W 504.66
TE 101 #Traverse ends on 101
TB #Another traverse begins
T 104 N62-46-16W 698.33 #Single course 104 to 102
TE 102
.MAP OFF #MAPMODE is turned off
Just like any other data entered in STAR*NET, the standard errors for data entered when
“MAPMODE” is on is controlled by default standard error values set in the Project
Options/Instrument dialog, or by values from the Instrument Library set when the
Instrument Library “.INSTRUMENT” inline option is used. Also explicit standard error
values or fixity symbols may be entered on the data lines as illustrated on the traverse
station 103 line above.
When “MAPMODE” is on, data may be 2D (as shown above) or 3D. Traverse lines
entered as 3D follow all the same rules as normal 3D traverse lines, except that a bearing
or azimuth is entered rather than a horizontal angle. The purpose of the “MAPMODE”
option is to allow for easy preparation of already-reduced horizontal map information,
therefore its use in the 3D data mode is likely very limited.
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