Sentinel-3 OLCI Notations Definition

Absorption: a measure of the ability of a surface to absorb incident energy, often at specific wavelengths.

Albedo: the ratio of the radiation reflected from an object to the total amount incident upon it, for a particular portion of the spectrum.

BRDF: the Bidirectional Reflectance Distribution Function describes the reflectance properties of a solid surface by identifying the amount of radiance reflected from one direction into another direction, with respect to the surface.

Detector index: index of the CCD detector (1 to 15).

Frame: the set of measurements acquired by the instrument at a given time.

Irradiance: the density of the radiant flux that is incident on a surface per unit of wavelength.

Instrument frame: a set of instrument pixels acquired at the same instant

Luminance: the quantitative attribute of light that correlates with the sensation of brightness and is the evaluation of radiance by means of the standard luminosity function.

netCDF: A NetCDF file contains dimensions, variables, and attributes, which all have both a name by which they are identified. These components can be used together to capture the meaning of data and relations among data fields in an array-oriented data set

Optical density: the logarithm to base 10 of the inverse of the transmittance.

Photon: a particle of light (or other electromagnetic radiation).

Pixel: Picture element: the set of measurements taken for a given location at a given time.

Product frame: a set of product pixels corresponding to a given satellite position.

Product Grid: see Sentinel-3 Product grid

Radiance: a measure of the energy radiated by the object together with the frequency distribution of that radiation.

Radiative transfer equation: the equation which describes the radiation passage through a scattering and absorbing medium.

Radiometer: an instrument for quantitatively measuring the intensity of electromagnetic radiation in some band of wavelengths in any part of the electromagnetic spectrum. Usually used with a modifier, such as an infrared radiometer or a microwave radiometer.

Rayleigh scattering: a form of atmospheric scattering that is caused when radiation interacts with particles whose diameter is much smaller than its wavelength. It therefore affects shorter wavelengths.

Reflectance: ratio of the intensity of reflected radiation to that of the incident radiation on a surface.

Rxxx: Water-leaving reflectance

Sample: single measurement item, i.e. a single spectral value of a given pixel.

Scattering: the process in which a wave or beam of particles is diffused or deflected by collisions with particles of the medium which it traverses.

Scattering phase function: the angular function which describes the directional scattering probability as a photon interacts with a scattering particle.

Spectrometer: a device used to measure radiant intensity or to determine the wavelengths of various radiations.

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