Magellan ProMark3 RTK Specifications download pdf (Page 284)

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Glossary

Attribute: A description item of a feature.

Attribute value: One of the possible values that can be ascribed to a

feature.

Base: A reference station operated in static mode.

B-File: A binary data file containing

GPS measurement data.

Baseline: A three-dimensional vector connecting the base to the rover.

The baseline length is the vector modulus.

Carrier phase data: Phase angle measurements for the 1575 MHz ra-

dio wave carrying the GPS coded messages. Using carrier phase data

greatly improves GPS accuracy.

Datum: A mathematical definition of a surface from which coordi-

nates of a given system are referenced.

D-File: A binary data file created by field collection software and

stored in the receiver.

DGPS: Differential GPS. A technique whereby data from a receiver at a

known location is used to correct the data from a receiver at an unknown

location. Differential corrections can be applied in real-time or by post-

processing. Since most of the errors in GPS are common to users in a wide

area, the DGPS-corrected solution is significantly more accurate than a

normal autonomous solution.

Differential Correction: The process of:

(1) calculating how much to adjust GPS measurements to reduce the

difference between a location's surveyed coordinates and the coordi

nates calculated by a GPS receiver that is kept stationary over that

point; and

(2) the application of these adjustments to the GPS measurements re-

corded by any number of receivers within a few hundred kilometers of

the "reference receiver."

Differential GPS: See DGPS.

Direct IP: (IP=Internet Protocol) A way of acquiring base data (corrections)

from the Internet via GPRS. When setting Direct IP in a receiver, you must

specify the IP address of the corrections provider.

E-File: A binary data file containing GPS ephemeris data.

Ephemeris Data: Information transmitted from a satellite which al-

lows the GPS receiver to determine the satellite’s position in space.

Export: Converting MobileMapper data files to GIS Formats and writ-

ing them to any directory visible to the PC.

Feature: Any element located in the field that you wish to record for

further uploading into a GIS database for example. A feature can rep

resent a real object (streetlight, park, electrical transformer, etc.) or

on the contrary, something invisible or impalpable (gas, noise level,

dose of fertilizer, etc.).

Each new feature that you log in the field can only be an “emanation”

or “offshoot” of one of the feature types described in the feature type

library associated with the job in progress. The logging procedure will

be different depending on the type of the feature you are logging.

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Magellan ProMark3 RTK Specifications Page 284

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