Spectra Precision FAST Survey Reference Manual - Manual (Page 103)

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 D&R:
The user can choose to measure direct and reverse readings for backsight, traverse, resection, topography, or
stakeout routines. If the user measures direct and reverse for the backsight readings, all foresight readings that also
are recorded direct and reverse will be recorded and computed as angle sets. If the backsight reading is only
measured direct, then foresight points that are measured direct and reverse are then combined to produce an average
observation record for the vertical circle, which is stored in the .rw5 file as a sideshot (SS) record. For calculation
purposes, the routine only averages the distances using both vertical circle readings, and uses the direct horizontal
reading for the direction. Both the direct and reverse readings are stored in the .rw5 file as a note record. When
disabled, (default setting) only the direct foresight shot will be taken. This option improves accuracy on elevation
measurements and mimics a feature found on the SDR data collectors. The Resection D&R will also apply to
Remote Benchmark.
 Reciprocal Calc
: The Reciprocal Calculation option has three settings: No, Prompted, and Always. It governs the
calculation of the elevation of foresight points taken with a total station, where a backsight measurement is also
taken. When set to Always, the program will calculate the distance to the foresight point and delta elevation by
combining the foresight and backsight measurements. When set to Prompted, the program will detect the backsight
measurement and ask the user if the occupied point should be calculated using both previous foresight and current
backsight. If set to No, the program calculates foresight points based only on the foresight measurement. If, for
example, you had a vertical difference of +1.2 going up to the foresight, and then when you backsighted the
difference was -1.0, the program would calculate the average difference (1.1) and would lower your occupied point
by 0.1 “on-the-fly”, prior to conducting foresights. This is useful for multi-setup topo work, in particular, where no
further adjustment is anticipated. For closed traverse or high-precision work, it is recommended that you run with
Reciprocals off and use the adjustment options found in your office software or within Cogo, Process Raw File, in
FAST Survey. Reciprocals, because they re-calculate your occupied point by combining the backsight with the
prior foresight information, should be used with care, because they will degrade the precision of the work if
backsights are not precisely measured, with correct target heights.
 Reverse Face Angles Only
: When taking Face 1 and Face 2 foresights, or when doing Set Collection, the program
will use the distance from the direct reading only, but will use the horizontal and vertical angles from both the direct
and reverse face readings. This setting is repeated and displayed within Configure in Set Collection. Any change
in either location controls the setting. (Note that in Manual Total Station, you will be prompted for reverse face
distance, but the entry will not be used.) When using robotic total stations, which do not take distance
measurements in reverse face, setting Reverse Face Angles Only is necessary to use motorized direct and reverse
readings.
 Reverse Face - Auto Turn:
This option is for motorized instruments only and when enabled will automatically
turn the instrument to the reverse face.
 Reverse Face - Auto Read:
This option will immediately take a reading after the instrument has turned to the
reverse face. You must make sure that the auto targeting option is on.
Localization
This command allows you to define the project coordinate system, geoid usage, and scale factors, as well as align on a
local coordinate system for GPS. Further discussions on localization are found in Tutorial 2 near the end of the manual.
System Tab
Click Edit Projection List to add to the list and to create user-defined projections. The user may select a predefined or
ceate a user-defined coordinate projection system