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ILLUMINATION ANGLE [11 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2025-05-27

English

Subject field(s)
  • Security Devices
  • Official Documents
DEF

An image or feature whose appearance in colour and/or design changes dependent upon the angle of viewing or illumination.

OBS

Examples are: features including diffraction structures with high resolution (diffractive optically variable image device/DOVID), holograms, colour-shifting inks (e.g. ink with optically variable properties) and other diffractive or reflective materials.

Key term(s)
  • optical variable device
  • optical variable feature

French

Domaine(s)
  • Dispositifs de sécurité
  • Documents officiels
DEF

Image ou élément dont l'apparence (couleur et/ou dessin) varie selon l'angle de vue ou d'éclairage.

OBS

Exemples : éléments incluant des structures diffractives à haute résolution (DOVID - image diffractive optiquement variable), hologrammes, encres à couleur changeante (par exemple, encres à propriétés optiquement variables) ou autres matériaux diffractifs ou réfléchissants.

Key term(s)
  • élément optique variable
  • dispositif optique variable
  • marque optique variable

Spanish

Save record 1

Record 2 2012-11-30

English

Subject field(s)
  • Highway and Street Lighting
DEF

The ratio of the luminance of a field to the illuminance of the plane of that field, for a diffuse illumination and an observation direction forming a grazing angle with the road surface.

OBS

luminance coefficient under diffuse illumination: term and definition proposed by the World Road Association.

French

Domaine(s)
  • Éclairage des voies de circulation
DEF

Rapport de la luminance d'un champ et de l'éclairement du plan de ce champ, pour un éclairage diffus et une direction d'observation formant un angle rasant avec la surface de la chaussée.

OBS

coefficient de luminance en éclairage diffus : terme et définition proposés par l'Association mondiale de la route.

Spanish

Save record 2

Record 3 2007-01-31

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Spacecraft
  • Remote Sensing
DEF

The angle at which incident electromagnetic waves (more significantly those in the visible, infrared and microwave bands) strike the surface of the object.

OBS

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

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Engins spatiaux
  • Télédétection
DEF

Angle défini par la verticale de la plate-forme et l'axe principal du faisceau radar.

OBS

rayonnement : Le rayonnement est le processus de transmission d'énergie sous forme de particules ou d'ondes électromagnétiques, ou encore d'ondes acoustiques. L'irradiation est une action.

OBS

Bien qu'utilisé, le terme «angle d'éclairage» est moins rigoureux.

OBS

angle d'irradiation : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
  • Naves espaciales
  • Teledetección
Save record 3

Record 4 2007-01-31

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Spacecraft
  • Remote Sensing
DEF

Description of the geometric orientation in the horizontal plane of an object in the scene with respect to the illuminating wavefront.

CONT

The aspect angle... can have a significant influence on the appearance of radar imagery, especially when features in the scene have an organized linear structure, such as agricultural crops or geological structures. When a radar's illumination is oriented perpendicular to geologic features such as faults, lineaments and outcrops, [there is] increased contrast and shadowing of the features in the image results. This is a favourable aspect angle for the image interpreter, as terrain is enhanced. In agricultural applications, fields imaged from different aspect angles may result in different tones on the image because of row or planting direction. Aspect angle can cause imaging geometry to be either enhanced or suppressed.

OBS

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

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Engins spatiaux
  • Télédétection
DEF

Description de l'orientation géométrique de l'objet ciblé dans le plan horizontal par rapport à l'éclairement lumineux du front d'onde.

OBS

angle d'aspect : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
  • Naves espaciales
  • Teledetección
Save record 4

Record 5 2007-01-31

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
  • Spacecraft
  • Remote Sensing
DEF

The angle defined by the incident radar beam and the vertical (normal) to the intercepting surface.

CONT

The incidence angle is commonly used to describe the angular relationship between the radar beam and the ground, surface layer or a target. A change of the radar illumination angle often affects the radar backscattering behaviour of a surface or target. The incidence angle changes across the radar image swath; it increases from near range to far range. In the case of satellite radar imagery, the change of incidence angle for flat terrain across the imaging swath tends to be rather small, usually on the order of several degrees. In the case of an inclined surface(slope), the local incidence angle is defined as the angle between the incident radar beam and a line that is normal to that surface. The local incidence angle determining, in part, the brightness, or image tone, for each picture element(pixel) and slope facet, is a key element in the prominent rendition of terrain features in radar imagery.

OBS

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

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Engins spatiaux
  • Télédétection
DEF

Angle, en un point du sol, entre la verticale et la direction du satellite.

OBS

L'angle d'incidence détermine l'apparence de la cible sur une image. À chaque pixel d'une image correspond un angle d'incidence local qui varie en fonction des cibles au sol : arbres, rochers, édifices etc., d'où des variations de l'intensité du pixel.

OBS

angle d'incidence : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

PHR

Angle d'incidence élevée, favorable, variable.

PHR

Signal HH à faible angle d'incidence.

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
  • Naves espaciales
  • Teledetección
CONT

El ángulo de incidencia describe la relación entre la iluminación del radar y la superficie de tierra. Específicamente, es el ángulo entre el rayo del radar y un objeto en la superficie. El ángulo de incidencia ayuda a determinar el aspecto de un objeto en la imagen.

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Record 6 2005-10-05

English

Subject field(s)
  • Remote Sensing
DEF

The differential illumination of ground surfaces due to slope angle and aspect variations resulting in surface cover types having a wide range in radiance values.

CONT

The topographic effect is indicated on Landsat images of rugged terrain by the visual impression of relief. It is caused by the variation in spectral radiance due to surface slope and aspect variations. The difference in radiance between a horizontal and sloping surface of the same cover type provides a measure of the topographic effect (Holben and Justice 1981). Holben and Justice (1979) also measured it and showed that the effect is most extreme in areas of rugged terrain and especially for slopes in the principal plane of the sun and at low solar elevations.

OBS

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

French

Domaine(s)
  • Télédétection
OBS

Les pentes et variations des surfaces au sol engendrent un éclairement différentiel d'où la vaste gamme de valeurs de radiance selon les types de couverture.

OBS

effet topographique : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Save record 6

Record 7 2002-01-11

English

Subject field(s)
  • Printing Machines and Equipment
DEF

Extremely faint marks in the coated paper surface that are only about 6 mm (¼") long and are about 3 mm (1/8") wide.

OBS

They are usually not in a straight line but tend to wander to one side or the other. They are best seen when inspected at a very low angle with low angle illumination.

French

Domaine(s)
  • Équipement (Imprimerie et arts graphiques)

Spanish

Save record 7

Record 8 2000-03-10

English

Subject field(s)
  • Properties of Paper
  • Graphic Arts and Printing
DEF

The amount of light reflected by a sheet of paper or board.

CONT

Gloss may be measured at various angles of illumination. For most printing papers, specular gloss is usually measured at 75° which is the angle between a line normal to the surface of the specimen and the direction of reflected and incident light. Instruments used to measure this property are called glarimeters or gloss meters.

OBS

gloss: term standardized by ISO.

Key term(s)
  • gloss of paper

French

Domaine(s)
  • Propriétés des papiers
  • Imprimerie et arts graphiques
DEF

Taux de réflexion d'un rayon lumineux tombant sous une certaine incidence sur la surface d'un papier ou d'un carton. [Définition normalisée par l'ISO.]

CONT

Le brillant se mesure à différents angles d'illumination.

OBS

brillant : terme normalisé par l'ISO.

Spanish

Save record 8

Record 9 1985-11-01

English

Subject field(s)
  • Illumination Engineering
DEF

Angle between the straight lines joining the reference centre to the centre of the receptor and to the centre of the source of illumination.

OBS

symbol: a [alpha].

French

Domaine(s)
  • Éclairagisme
DEF

Angle entre les droites joignant le centre de référence au centre du récepteur et au centre de la source d'éclairage.

OBS

sym. a [alpha].

Spanish

Save record 9

Record 10 1982-09-27

English

Subject field(s)
  • Air Transport
OBS

The chromaticities(...) shall be determined under the following standard conditions :angle of illumination : 45 degrees(...)

French

Domaine(s)
  • Transport aérien
OBS

Les quantités colorimétriques (...) seront déterminés dans les conditions types ci-après: [l'] angle d'éclairement [est de] 45 degrés (...)

Spanish

Save record 10

Record 11 1980-07-15

English

Subject field(s)
  • Photography
OBS

Illumination reaching a subject, normally from an oblique angle, to produce the best rendering of surface texture. Also known as Cross Lighting.

French

Domaine(s)
  • Photographie
OBS

Éclairage dirigé sur un sujet, normalement suivant un angle oblique, pour accroître le relief de la surface. S'appelle également éclairage croisé.

Spanish

Save record 11

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