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GB/T 36299-2018 English PDF (GBT36299-2018)

GB/T 36299-2018 English PDF (GBT36299-2018)

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GB/T 36299-2018: Basic terminology of radiative transfer in optical remote sensing
GB/T 36299-2018
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.200
A 77
Basic terminology of radiative transfer in optical
remote sensing
ISSUED ON: JUNE 07, 2018
IMPLEMENTED ON: JANUARY 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 General terminology ... 4 
3 Terminology for interaction between electromagnetic radiation and ground
objects ... 10 
4 Terminology for interaction between electromagnetic radiation and
atmosphere ... 12 
Appendix A (Informative) Radiative transfer models ... 17 
Bibliography ... 21 
Index ... 23 
Basic terminology of radiative transfer in optical
remote sensing
1 Scope
This Standard specifies the general terminology involved in the radiative
transfer of optical remote sensing in the 0.38 μm~15 μm spectral band, the
terminology for interaction between electromagnetic radiation and ground, and
the terminology for interaction between electromagnetic radiation and
atmosphere.
This Standard applies to optical remote sensing and its applications.
2 General terminology
2.1 [Electromagnetic] radiation
a) The phenomenon that energy is emitted from a source to space in the
form of electromagnetic waves.
b) Energy travels through space in the form of electromagnetic waves.
[GB/T 4365-2003, definition 161-01-10]
2.2 [Electromagnetic] spectrum
The graph which represents the wavelength or frequency distribution of
electromagnetic radiation.
[GB/T 14950-2009, definition 4.109]
2.3 Solar radiation
Electromagnetic radiation from the sun.
2.4 Solar radiation spectrum
The graph which shows the distribution of solar radiant energy by wavelength
or frequency.
Note: Modify GB/T 14950-2009, definition 4.108.
2.5 Radiant energy
The radiant flux of a radiant source in a unit solid angle in a given direction.
Note: The unit is Watts per spherical degree (W/sr).
2.14 Spectral radiant intensity
Radiant intensity at unit wavelength.
Note: The unit is Watts per spherical degree micrometer [W/(sr • μm)].
2.15 Monochromatic radiation
Radiation with a single wavelength or frequency.
2.16 Optical radiation
Electromagnetic radiation having a wavelength between a transition region to
X-rays (about 1 nm) and a transition region to radio waves (about 1 mm).
2.17 Visible radiation
Optical radiation which can directly cause visual perception.
Note: There is no clear limit on the spectral range of visible radiation. It depends on the
radiant power reaching the retina and the responsiveness of the observer. The lower
limit is generally between 360 nm and 400 nm. The upper limit is between 760 nm
and 830 nm. Its spectral range is usually 0.38 μm~0.78 μm.
2.18 Ultraviolet radiation
Optical radiation with a wavelength less than the wavelength of visible radiation.
2.19 Infrared radiation
Optical radiation with a wavelength greater than the wavelength of visible
radiation.
Note: The spectral range of infrared radiation is usually 0.78 μm~15 μm, which can be
divided into near-infrared radiation (0.78 μm~1.4 μm), shortwave infrared radiation
(1.4 μm~3 μm), middle infrared radiation (3 μm~6 μm), and thermal infrared radiation
(6 μm~15 μm).
2.20 Thermal radiation
a) The emission of radiant energy due to the thermal excitation of particles
of matter (e.g., atoms, molecules, ions).
b) The radiation emitted by this process.
2.30 Lambert’s [cosine] law
The radiant intensity emitted by an ideal diffuse reflection surface is proportional
to the cosine of the angle between the direction of light exit and the normal of
the diffuse reflection surface.
Note: Its expression is: I(θ)=I0cos(θ), where I(θ) is the radiant intensity in the θ direction; I0
is the radiant intensity in the normal direction.
2.31 [Absolute] blackbody; full radiator, full emitter; Planckian radiator
An ideal thermal radiator which can absorb all incident radiation in any incident
direction, wavelength, and polarization state.
Note: The emissivity of a blackbody at any wavelength is equal to 1.
2.32 Grey body
Thermal radiator with emissivity between 0~1 that does not change with
wavelength.
2.33 Selective radiator
The thermal radiator whose spectral emissivity varies with wavelength in the
considered spectral range.
[GB/T 2900.65-2004, definition 845-04-10]
2.34 Lambertian radiator; Lambertian surface
The radiator or radiating surface which radiates at an angle specified by
Lambert's cosine law.
[GB/T 14733.12-2008, definition 731-01-38]
2.35 Point radiant source
The radiant source with a sufficiently small size. Its size, compared with its
distance from the irradiated surface, can be ignored in calculation and
measurement.
Note: Point sources which radiate uniformly in all directions are called isotropic point
sources or uniform point sources.
[GB/T 2900.65-2004, definition 845-01-19]
2.36 Standard radiant source
3 Terminology for interaction between electromagnetic
radiation and ground objects
3.1 Reflectance
The ratio of the radiant flux reflected by an object to the incident radiant flux.
3.2 Absorptance
The ratio of the radiant flux absorbed by an object to the incident radiant flux.
3.3 Transmittance
The ratio of the radiant flux passing through an object to the radiant flux incident
on the object.
3.4 [Hemispherical] emissivity
The ratio OF the radiant exitance of a thermal radiator TO the radiant exitance
of a blackbody at the same temperature.
3.5 Spectral characteristics of ground objects
USE the form of a spectral curve to describe the characteristics of the reflection,
absorption, emission, scattering, and transmission of ground objects as a
function of wavelength.
3.6 Bidirectional reflectance distribution function; BRDF
The ratio OF the micro-increment of the reflected radiance in a specific direction
of the object surface TO the micro-increment of the incident irradiance in a
specific direction.
Note: The unit is per spherical degree (sr-1).
3.7 Bidirectional reflectance factor
The ratio OF the reflected radiance of an object surface in a particular direction
TO the reflected radiance of an ideal diffuse reflector in that direction under the
same irradiance.
3.8 Albedo
The ratio OF the radiant flux reflected from an object surface to the hemisphere
(2π) space TO the radiant flux incident on the object surface from the
hemisphere (2π) space.
4 Terminology for interaction between electromagnetic
radiation and atmosphere
4.1 Atmospheric window
Some specific electromagnetic wave bands where the atmosphere does not
have a strong attenuation effect (absorption, scattering, etc.) on
electromagnetic wave transfer.
4.2 Atmospheric radiation
Electromagnetic radiation scattered and emitted by atmospheric molecules and
particles.
4.3 Atmospheric up-welling radiance; atmospheric path radiance
The radiance which directly reaches the remote sensor from the atmospheric
scattered solar radiation and the emitted radiation of the atmosphere itself
without reflection from the ground.
Note: The unit is Watts per square meter spherical degree [W/(m2 • sr)].
4.4 Atmospheric down-welling radiation
The atmospheric scattered solar radiation and the emitted radiation of the
atmosphere itself received by the earth’s surface.
Note: The unit is Watts per...
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