Spectra-precision Survey Pro v3.80 Recon GPS User Manual User Manual download pdf (Page 20)

GPS User’s Manual

Survey Pro Coordinate System

Database

Survey Pro uses a Coordinate System Database file (*.CSD) to store

the map projection and datum transformation parameters for many

different coordinate systems around the world. Also, horizontal and

vertical localization adjustments are stored as site records in the

database. Below is a list of the terminology used to describe the

different records in the coordinate system database.

•

Zone: Is the basic record type. A zone record specifies the type of

map projection and its parameters. Most zone records have

datum and ellipsoid records, and usually a geoid record, already

in the database.

•

Site: Is a zone record with a horizontal and/or vertical

localization adjustment added. Localizations are usually used to

correct GPS positions starting from an autonomous base. They

can be computed from control points or from manual input of

parameters.

•

Zone Group: Is a collection of zone and/or site records used to

keep the database organized and user selection easier.

•

Datum: Is a type of datum transformation and its parameters. A

datum record will always have an ellipsoid record already in the

database.

•

Ellipsoid: Are the two parameters specifying the ellipsoid of the

datum.

•

Geoid: Is a geoid model and its associated data file.

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Spectra-precision Survey Pro v3.80 Recon GPS User Manual User Manual Page 20