Spectra-precision Survey Pro v3.80 Recon GPS User Manual User Manual download pdf (Page 41)

RTK Data Collection

Solve Localization

When you start a GPS survey from an autonomous base position, you

need to solve a Localization to adjust GPS measurements into local

coordinates. This is the case for both horizontal projection modes.

Using

Ground - TDS Localization

, you need to solve a localization to

relate your arbitrary GPS start point into your non-geodetic local

system. Using a

Mapping Plane

, you need to solve a localization to

shift the autonomous GPS start point into accurate geodetic

coordinates.

In either horizontal mode, the procedure is the same. Starting from

an autonomous GPS base setup, you measure GPS positions on

control points with know local plane (N,E) coordinates. The

parameters for a 2D similarity transformation are calculated with a

least squares solution using the control points. These parameters are

added to the zone record (selected map plane zone or default

Localization zone) to create a zone based site record.

Vertical Localizations, with or without a geoid model, uses the same

field procedure. Starting from an autonomous GPS base setup, you

measure GPS positions on control points with know local elevations.

The vertical adjustment parameters are calculated from the control

points. The vertical adjustment will be either a shift to correct geoid

elevations to local elevations, or an inclined plane to correct for

vertical shift and tilts.

Note: If you are starting a new job in

Ground - TDS Localization

mode, you do not need control points. Simply set the base on your

first job file point and solve the projection at the prompt. For a more

detailed description of the easiest way to start a new job using Survey

Pro, see the section on One Point Localizations. See Page 48.

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Spectra-precision Survey Pro v3.80 Recon GPS User Manual User Manual Page 41