NavCom SurveCE Integration Rev.A - Manual (Page 132)

SurvCE™ Integration User Guide – Rev. A
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the best relative orthometric heights are desired at
other points. Be cautious when using multiple
vertical control points in a three dimensional
solution. The geoid model is a good check and
can be better than solving for a 3D transformation
because the local control points can have more
vertical error than the geoid model.
•
Units : Coordinates can be converted into one of
three available units, Metric, US Feet or
International Feet.
Scale Factor: After converting the LAT/LONG from
the GPS records to state plane coordinates and
applying the coordinate alignment (Localization, a.k.a.
transformation) file, the Project Scale Factor is
applied as the final adjustment to the coordinates.
This adjustment is used on the X, Y and not the Z.
The Project Scale Factor is applied by dividing the
distance between the coordinate and a base point by
the Project Scale Factor. The coordinate is then set
by starting from the base point and moving in the
direction of the coordinate for the adjusted distance.
The base point is the first point in the alignment
(Localization) file. If there are no points specified in
the alignment (Localization) file, then 0, 0 is used as
base point. The second dialog will prompt if an
alignment (Localization) file is to be used during the
process. This file is typically created by SurvCE using
the Localization routine. The file (*.dat) contains the
parameters to transform the derived State Plane
coordinates to the defined local coordinates. At the
end of the process, the coordinates are written to the
current *.crd file and a report is presented in the
Carlson editor for saving or printing purposes.