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SLOPE ASPECT [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2009-11-08

English

Subject field(s)
  • Mathematical Geography
  • Remote Sensing
CONT

Digital elevation data are sets of elevation measurements for locations distributed over the land surface. Elevation data have many practical uses ranging from environmental to urban. Slope and aspect can be directly derived from elevation. Stream delineation and subsequently watershed boundaries can also be derived. Elevation datasets are also used for scenario analysis ranging from calculations of cut and fill requirements by engineers for projects relating to road construction to viewshed analysis.

CONT

Digital elevation data have been obtained for 54 open rock basins from aerial diapositives using an analytical stereoplotter.

OBS

digital elevation data: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Géographie mathématique
  • Télédétection
CONT

Des données numériques d'altitude ont été obtenues pour 54 bassins rocheux avec des diapositives aériennes et au moyen d'un stéréorestituteur analytique.

OBS

données altimétrique numériques; données numériques d'altitude : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 1

Record 2 2007-01-31

English

Subject field(s)
  • Computer Graphics
  • Mathematical Geography
DEF

The process of generating and displaying contours automatically from a set of discrete values of the parameter being used in contouring.

CONT

Digital terrain models(interpolation, extrapolation-automatic contouring-Perspective viewing, analytical hill shading, aspect, slope).

French

Domaine(s)
  • Infographie
  • Géographie mathématique
DEF

Processus de génération et de tracé d'isolignes, ou de courbes de niveau, réalisé automatiquement à partir d'un ensemble de valeurs discrètes prises par une fonction définie sur un espace à 2 dimensions ou plus.

Spanish

Campo(s) temático(s)
  • Gráficos de computadora
  • Geografía matemática
Save record 2

Record 3 2006-12-19

English

Subject field(s)
  • Meteorological Forecasting, Data Measurement and Analysis
DEF

A snow profile obtained by excavating a snowpit at a recent slab avalanche release site.

CONT

Fracture line profile [is] a graphical representation of the components of a slab avalanche prepared by excavating a snowpit at the crown face and measuring a variety of snow parameters from the surface down at and including the bed surface(and sometimes extending to the ground). Typical parameters measured include time, date, location, weather, slope angle, aspect, slab dimensions, and include the snowpack stratigraphy parameters plotted at the appropriate depth from the surface in cm : density, hardness, temperature, moisture, fracture depth.

CONT

A fracture line profile showed that the slab failed on facets. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

CONT

A fracture line profile revealed that the weakness involved dates back to November. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

Fracture line profile [must be done] ideally within 24 hours after [the avalanche slab] occurrence.

OBS

fracture line profile: term officially approved by the Avalanche Bulletin Terminology Standardization Committee.

French

Domaine(s)
  • Prévisions météorologiques et mesure et analyse des données
CONT

Le profil de cassure linéaire indique que la plaque a cédé sur une couche de grains à faces planes. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

CONT

Le profil de cassure linéaire a révélé que les couches fragiles en cause se sont formées en novembre. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

profil de cassure linéaire; profil de fracture linéaire; profil de cassure; profil de fracture : termes uniformisés par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 3

Record 4 2006-12-12

English

Subject field(s)
  • Meteorological Forecasting, Data Measurement and Analysis
CONT

Record your field observations in a notebook. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

Observation is the key to safe travel in avalanche terrain. Observation not only of the mountain scenery but of the multitude of clues indicating snow conditions visible to the perceptive traveller. Some of the things you should look for are as follows : Evidence of Avalanching.... Wind Direction. Aspect. The aspect of a slope to both sun and wind is most important.... The Snow Surface....

OBS

Travelers in the backcountry usually make mental notes of the observed factors and draw immediate conclusions about snow stability. Snow safety operations, however, usually retain written records of the observations. The records are needed for future analysis, for application in forecasting models, and for communication with other operations and agencies. ... Observations should be carried out accurately, reliably, and according to standards (when standards for data collection exist). ... Every observation should be relevant to snow stability. ... Observation should be carried out in places where weather and snow conditions simulate avalanche starting zones as closely as possible ...

OBS

field observation: term officially approved by the Avalanche Bulletin Terminology Standardization Committee.

French

Domaine(s)
  • Prévisions météorologiques et mesure et analyse des données
CONT

La prévention et gestion du risque (spatial) d'avalanches sur un site. [...] Une étude locale du site : Trois analyses sont engagées simultanément à ce premier stade de l'expertise : (i) l'étude des critères physiques du site avalancheux [...] (ii) l'étude de ses conditions climatiques hivernales [...] (iii) enfin, l'étude des avalanches historiques [...] Ces trois enquêtes consistent à rassembler les données de base nécessaires à l'étape suivante [soit, la description de scénarios d'avalanches majeures], mais constituent déjà des expertises en elles-mêmes. Il y a intérêt à les mener conjointement car elles reposent évidemment en grande partie sur le résultat des observations de terrain à effectuer sur le site.

CONT

Inscrivez vos observations de terrain dans votre carnet de notes. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

observation de terrain : terme uniformisé par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 4

Record 5 2006-10-20

English

Subject field(s)
  • Mathematical Geography
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

The compass direction a slope faces.

CONT

Slope Orientation. The orientation of the slope to the wind and sun is critical. Leeward slopes (facing away from the prevailing wind) are rapidly loaded by heavy snowfall, even during periods of clear weather. ... The slope’s orientation to the sun is also important. South-facing slopes receive the greatest amount of incoming solar radiation and tend to stabilize more quickly, but they may also release as a wet slide when the sun warms them.

CONT

Natural and accidental avalanches were reported this week in various areas on steep slopes, in particular, on south and east aspect. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

For example, a slope on the east side of a mountain has an east aspect.

OBS

aspect; slope aspect : terms officially approved by the Avalanche Bulletin Terminology Standardization Committee.

French

Domaine(s)
  • Géographie mathématique
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Direction dans laquelle est orientée une pente.

CONT

L'exposition intervient sur la quantité de neige puisqu'elle détermine l'incidence du vent; elle intervient également sur les métamorphoses de la neige puisqu'elle conditionne l'exposition au rayonnement solaire et l'échauffement du manteau neigeux.

CONT

Cette semaine, on a observé plusieurs avalanches naturelles et accidentelles dans plusieurs secteurs, en particulier, dans les pentes raides à orientation sud et est. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

versant; orientation; exposition: termes uniformisés par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 5

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 1976-06-19

English

Subject field(s)
  • Forestry Operations
OBS

An area, considered with reference to forest producing power; the factors of the locality are the altitude, soil, slope, aspect and other local conditions influencing forest growth

French

Domaine(s)
  • Exploitation forestière

Spanish

Save record 7

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