Magellan ProMark 3 Spezifikationen PDF herunterladen (Seite 209)

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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 Station: See Reference Station.

B-File: A binary data file containing

GPS measurement data.

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 Global Positioning System. Commonly used to re-

fer to real-time differential correction techniques.

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.

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.

To log a feature: Means to save the characteristics of a feature

into the receiver memory. The user is in charge of entering the

description of this feature whereas the receiver is responsible for

saving the GPS position(s) it has determined on this feature.

To describe a feature: Means to give each attribute of the feature

one of the prompted values for this feature.

Feature Library: A file containing all the feature types required for a

given job. (In fact we should say “Feature Type Library”.)

Feature Type: An item present in a feature library. Each feature type

is defined by a geometry type, a name, a certain number of possible

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