Spectra Precision Survey Pro v4.9 - Manual (Page 117)

Solve from Control Points
Calibration scale
[Calculate scale from control points]: Select this option to calculate the best-fit scale parameter from the horizontal
control points. This is the default setting
[Fix scale to 1.0]: Select this option to calculate a fixed scale calibration, where the rotation and translation are
calculated from control points, but the scale is fixed to 1.0.
NoteWhen you are using Default Ground Calibration mode, a scale of 1.0 will give ground distance at the default
origin height, which is usually the height of the first control point. You can modify the default calibration zone using
the
Calibration Set Zone screen. When you are using Mapping Plane mode, a scale of 1.0 will give you exact grid
distances on the mapping plane.
Calibration origin
[Origin at centroid of control points]: Select this option to solve the origin parameter at the centroid of the horizontal
control points. This is the default setting.
[Select a point for calibration origin]: Select this option if you wish to override the default behavior of using the
centroid of the control coordinates as the origin. You will need to assign an origin point below.
[Origin Point ]: Enter a point for the calibration origin. This point must be one of the active horizontal control points.
Key in parameters
The Key in parameters screen is used to input calibration horizontal and vertical parameters by hand. This can be done
to copy a calibration solution between data collectors in the field, or to recreate a calibration solution from a raw data
printout.
Horizontal Card
The Horizontal card is used to manually enter the six parameters of the horizontal calibration solution.
Scale: Enter the scale factor.
Rotation: Enter the rotation angle.
Translation (N,E): Enter the horizontal shift (N,E) from the intermediate map projection to the local coordinate
system.
Origin N/E: Enter the origin location, in intermediate mapping plane coordinates, of the scale and rotation point.
Vertical Card
The Vertical card is used to manually enter the five parameters of the vertical calibration solution.
Slope N: Enter the slope of the inclined plane along the local north grid axis in parts per million.
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