Calculate scale, Wizard – Spectra Precision Survey Pro v4.9 User Manual
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Use a grid factor with sea level correction: Uses a mapping plane scale factor that is adjusted for elevation changes.
Use automatic map plane grid factor with sea level correction: Uses a combined scale factor that is adjusted for
elevation changes.
Use map plane ground coordinates: When selected, you can configure the job to use map plane ground coordinates.
Combined Factor: Enter a combined scale factor if already known, otherwise is the combined scale factor computed
from the
Grid Factor: Enter a map plane scale factor if already known, otherwise is the scale factor computed from the
[Calculate Scale]: Opens the
wizard, which is used to calculate a combined scale factor or map plane
scale factor.
[Setup Map Ground Coordinates]: First checks that a map projection is selected and if not, prompt you to select one.
Next, opens a wizard where after providing an origin point and ground system offset coordinates, the entire job
northing/easting database will be updated with the ground coordinate system transformation.
[Change Map Zone]: Opens the
wizard where you can choose a mapping plane zone or
calibrated site from the coordinate system database file. You can also create a new zone and datum with user-specified
parameters.
Calculate Scale
[Job] [Settings] [Surveying] [Setup Scale] [Calculate Scale]
The Calculate Scale wizard is available when Use a single combined scale factor or Use a grid factor with sea level
correction is selected in the
screen and is used to compute a scale factor. If a map zone is not currently
selected, you will first be required to
before continuing.
Projection: Displays the details about the current map zone.
Select Point: Specify a reference point.
[Calc Scale >]: Opens Screen Two if Use a single combined scale factor was selected. If Use a grid factor with sea
level correction was selected, you will return to the
screen and the computed grid factor will be entered
for you.
- Screen Two -
Ellipsoid Height: The height of the ground above the ellipsoid surface.
[< Back]: Returns to the previous screen.
[Solve >]: Opens Screen Three.
- Screen Three -
Mapping Plane Scale Factor: Displays the scale factor that will correct for the effects of map projection distortion.
Ellipsoid Scale Factor: Displays the scale factor to correct for the geometric effect of your height above the ellipsoid
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