Adjustment Settings

When the Adjustments box is checked, the adjustment settings are available for editing. Most of these settings are device-dependent. For example, the Distance constant is dependent on the device used to measure distances. Most modern electronic distance measuring (EDM) equipment has an inherent accuracy of 0.01 - 0.02 feet.

These settings are copied to the Survey Adjustment tree in Project Explorer for each field book that is created. These values can be set from the tree and therefore can serve as a seed or default setting.

Settings	Description
Combined Scale Factor	Combine Scale Factor options are as given below: Select Do Not Use Compute Global using Control Points Compute Each Setup Use Global Combined Factor Use Setup Combined Factor
Combined Scale Factor Value	Specifies the Combined Scale Factor Value.
Display errors in Message Center	True or False
Add-on for Distance Constant	Accuracy of measured distances based on a set of redundant measurements.
Add-on for Distance PPM	The parts per million correction for measured distances based on the principle that an error will be proportional to the length of the line. This is device dependent as well, but not to be confused with the corrective PPM applied for atmospheric conditions on the instrument itself.
Add-on for Horizontal angle	Inherent accuracy of measured angles based on a set of redundant measurements.
Add-on for Azimuth	Accuracy of azimuth - This is not the same as angle accuracy; it is based on the accuracy of a predefined direction used as a backsight.
Add-on for Trig level constant	Accuracy of elevations measured with total station distance/vertical angle calculations.
Add-on for Trig level PPM	Parts per million additive for measured trig elevations. As with Distance PPM, this is based on the length of the error being proportional to the length of the line.
Add-on for Differential leveling Constant	Accuracy of elevations derived from differential levels, using leveling instrument and leveling rod and taking into consideration that backsights and foresights are equal in length and that readings are taken to a rod held plumb.
Default Distance error estimate	The computed factor applied to a set of measured distances based on the precision or repeatability of those measurements as related to predefined coordinates used to control the traverse.
Default Distance PPM	The corrective factor that is actually applied according to the Error Distant Constant.
Default Horizontal angle error estimate	The computed factor applied to a set of measured angles based on the precision or repeatability of those measurements as related to predefined coordinates used to control the traverse.
Default Azimuth error estimate	The corrective factor that is applied according to the repeated angular measurements in the traverse and the actual Azimuth direction as determined by predefined coordinates.