TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

ACROSS-TRACK DIRECTION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2007-03-11

English

Subject field(s)
  • Spacecraft
  • Remote Sensing
DEF

A scanner with an oscillating mirror that moves back and forth across the satellite’s direction of travel, creating scan line strips that are contiguous or that overlap slightly.

CONT

One type of scanner is called a whiskbroom scanner also referred to as across-track scanners. It uses rotating mirrors to scan the landscape below from side to side perpendicular to the direction of the sensor platform, like a whiskbroom. The width of the sweep is referred to as the sensor swath. The rotating mirrors redirect the reflected light to a point where a single or just a few sensor detectors are grouped together. Whiskbroom scanners with their moving mirrors tend to be large and complex to build. The moving mirrors create spatial distortions that must be corrected with preprocessing by the data provider before image data is delivered to the user. An advantage of whiskbroom scanners is that they have fewer sensor detectors to keep calibrated as compared to other types of sensors.

OBS

across-track scanner; whiskbroom scanner: terms officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

Key term(s)
  • across track scanner
  • whisk broom scanner
  • whisk-broom scanner

French

Domaine(s)
  • Engins spatiaux
  • Télédétection
DEF

Scanneur ayant un miroir oscillant dont le déplacement perpendiculaire à la trajectoire du satellite engendre des lignes de balayage contiguës ou légèrement chevauchantes.

OBS

dispositif de balayage transversal : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Naves espaciales
  • Teledetección
CONT

El sistema de escáner transversal utiliza un espejo rotativo, éste se encuentra conectado a un motor eléctrico cuyo eje de rotación es paralelo a la dirección de vuelo.

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Record 2 2006-06-09

English

Subject field(s)
  • Remote Sensing
  • Range Measurements (Telecommunications)
DEF

For an across-track viewing radar, ground slant range corresponding to the look direction whose angle is at maximum with that of the active sensor vertical.

OBS

far range: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Télédétection
  • Mesures à distance (Télécommunications)
DEF

Pour un radar à visée latérale, distance-temps au sol qui correspond à la direction de visée dont l'angle avec la verticale du capteur actif est maximal.

OBS

La largeur de couloir (en anglo-américain : «swath width») est égale à la différence entre les portées distale et proximale.

OBS

portée distale : terme uniformisé par le Comité d'uniformisation de la terminologie spatiale (CUTS) et par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

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