Remote Sensing

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  • Created by: CJFOXALL
  • Created on: 29-05-17 11:27
The distance from any point on one cycle or wave of radiation to the same position on the next cycle or wave.
Wavelength
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To know the energy of a wave at a specific point in time and space we need to know the phase.
Phase
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Offset between two equal points on different waves with the same wavelength and frequency.
Phase Difference
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Energy of electromagnetic radiation.
Radiant Energy
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Radiant energy emitted, reflected, transmitted or received per unit of time.
Radiant Flux
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3D analogue of an angle that is subtended by planes meeting at a point.
Solid Angle
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The amount of Radiant Flux crossing a unit of area, measured in Wm-2.
Radiant Flux Density
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The energy coming into the surface, (Radiant Flux Density).
Irradiance
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The amount of radiant flux emitted by a surface per unit area.
Radiant Existence
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The process of material giving out energy, usually at longer wavelengths.
Emittance
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The energy going back out from the surface through reflectance, scattering or emittance.
Radiance
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Energy is returned from the surface of a material with an angle of reflectance, equal to or greater than angle of incidence.
Reflectance
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Inversely related to local incidence angle (angle gets bigger the less energy is measured).
Backscatter
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A hypothetical radiator that absorbs and re-emits ALL incident energy. Not reflecting any energy as it is theoretical.
Blackbody
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The ratio between emittance by an object and a blackbody of the same temperature.
Emissivity
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Emissivity depends upon material type and surface temperature
Selective Radiator
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A temperature measured in relation to the surface of the earth.
Radiating Temperature
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A temperature measured from absolute zero in Kelvins.
Absolute Temperature
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Deflection of energy in all directions by colliding with particles or a surface.
Scattering
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Multiple scattering events taking place when electromagnetic wave inside a medium containing scatters with discrete dielectric properties.
Volume Scattering
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Energy is absorbed by the material, usually by heating matter up.
Abosorption
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The passing of energy through substances of different materials causing a change in velocity of EM radiation.
Trasmission
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Overall dynamic property of the earth's atmosphere, allows irradiance through space without immediate absorption.
Atmospheric Window
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The energy is reflected and scattered perfectly in the forward direction to the angle of incidence, occurs on smooth surfaces.
Specular Reflectance
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The energy is reflected in all directions equally, occurs on rougher surfaces.
Diffuse Reflectance
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Objects with equal brightness when viewed from all directions (perfect surfaces), so energy is specular.
Lambertian
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How light is reflected at an opaque surface. Taking into account irradiance and radiance.
Bidirectional Reflectance
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The variation of reflectance or emittance of a material with respect to wavelengths.
Spectral Signature
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The angle between a ray of incidence on a surface and the normal (line perpendicular to the surface at point of contact).
Incidence Angle
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Accurately checking and measuring sensors to ensure data collected is correct and accurate.
Calibration
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Checking data collected against other data sets or specific validation data/points to ensure accuracy, correctness and validity.
Validation
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Collects data in many, very narrow contiguous spectral bands.
Hyperspectral
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Measure of sharpness of fineness of data in spatial data. Defined in distance by single length of one side of one pixel.
Spatial Resolution
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Measure of the specific wavelength intervals that a sensor can record. Determined by the 'bandwidth' of the channels used.
Spectral Resolution
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Measure of a sensor's ability to distinguish between two objects of similar reflectance. The ability for a sensor to distinguish between subtle changes in reflectance value.
Radiometric Resolution
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Measure of a sensor's ability to distinguish between two objects of similar reflectance. The ability for a sensor to distinguish between subtle changes in reflectance value.
Temporal Resolution
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The type of remote sensing system, depending on the spatial, spectral, radiometric and temporal resolution requirements.
Platform
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The camera that captures the data. Can be passive (use sun energy) or active (send out own EM pulse).
Sensor
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The combined components of the whole remote sensing kit, including sensor and flight method.
System
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When two coherent waves (same velocity and frequency) are combined.
Interference
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Transverse EM waves, oscillations are perpendicular to direction of travel.
Polarisation
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The measure of similarity between two waves separated in space and time.
Coherence
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The result of interference between the coherent echoes of individual scatters with a resolution cell.
Speckle
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Other cards in this set

Card 2

Front

To know the energy of a wave at a specific point in time and space we need to know the phase.

Back

Phase

Card 3

Front

Offset between two equal points on different waves with the same wavelength and frequency.

Back

Preview of the front of card 3

Card 4

Front

Energy of electromagnetic radiation.

Back

Preview of the front of card 4

Card 5

Front

Radiant energy emitted, reflected, transmitted or received per unit of time.

Back

Preview of the front of card 5
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