[CF-metadata] New Standard Names for Satellite Data
Dear All,
I wish to propose the standard names below for acceptance in the official
list. Those of you with good memory may remember my message from
October 2010 where I proposed several very similar names. There was
never a final
decision on that proposal so consider the names here as the improved
version of the old ones. Hopefully the second try will be more successful.
The names are developed primarely to support satellite data and were
first posted on the CF-Satellite mailing list. I am very grateful to
that community for all the comments and suggestions. This proposal is
much better because of that.
Proposed standard names are:
1) sensor_band_identifier
Alphanumeric identifier of a sensor band.
Units: N/A
2) sensor_band_central_wavelength
The central wavelength of a sensor's band, calculated as the first
moment of the band's normalized spectral response function.
Units: m
3) sensor_band_central_wavenumber
The central wavenumber of a sensor's band, calculated as the first
moment of the band's normalized spectral response function.
Units: m-1
4) sensor_band_central_frequency
The central frequency of a sensor's band, calculated as the first
moment of the band's normalized spectral response function.
Units: Hz
5) time_interval
An interval of time.
Units: s
6) datetime_iso8601
String containing date-time information in one of the ISO 8601
formats. Variables with this standard name cannot serve as coordinate
variables.
Units: N/A
7) sensor_zenith_angle
The angle between the line of sight to the sensor and the local
zenith; a value of zero is directly overhead.
Units: degree
8) platform_look_angle
"platform" refers to the vehicle from which observations are made e.g.
airplane, ship, or satellite. Platform look angle is the angle between
the line of sight from the platform and the direction straight
vertically down. Zero look angle means looking directly beneath the
platform.
Units: degree
9) sensor_look_angle
The angle between the line of sight from the sensor and the direction
straight vertically down. Zero look angle means looking directly
beneath the sensor.
Units: degree
10) platform_azimuth_angle
"platform" refers to the vehicle from which observations are made e.g.
airplane, ship, or satellite. Platform azimuth angle is the horizontal
angle between the line of sight from the observation point to the
platform and a reference direction at the observation point, which is
often due north. The angle is measured clockwise starting from the
reference direction.
Units: degree
11) sensor_azimuth_angle
The horizontal angle between the line of sight from the observation
point to the sensor and a reference direction at the observation
point, which is often due north. The angle is measured clockwise
starting from the reference direction.
Units: degree
12) relative_platform_azimuth_angle
Difference between two platform_azimuth_angle values.
Units: degree
13) relative_sensor_azimuth_angle
Difference between two sensor_azimuth_angle values.
Units: degree
14) toa_outgoing_spectral_radiance
"toa" means top of atmosphere; "outgoing" means emitted toward outer
space; "spectral" means per unit wavenumber or as a function of
wavenumber. Radiance is the radiant power per unit area in a
particular direction per unit of solid angle.
Units: mW m-2 sr-1 (cm-1)-1
15) toa_outgoing_spectral_radiance_mean_within_collocation_target
An average of toa_outgoing_spectral_radiance observations from
sensor's adjacent field of views within a collocation target.
Collocation target is an area on the Earth's surface at which
observations from at least two sensors are collected. Its size is
defined by the sensor with the largest field of view footprint.
Units: mW m-2 sr-1 (cm-1)-1
16) toa_outgoing_spectral_radiance_stdev_within_collocation_target
Standard deviation of toa_outgoing_spectral_radiance observations from
sensor's adjacent field of views within a collocation target.
Collocation target is an area on the Earth's surface at which
observations from at least two sensors are collected. Its size is
defined by the sensor with the largest field of view footprint.
Units: mW m-2 sr-1 (cm-1)-1
17) toa_outgoing_spectral_radiance_mean_within_collocation_scene
An average of toa_outgoing_spectral_radiance observations within a
collocation scene. Collocation scene is a grouping of sensor's
adjacent field of views (FOVs) centered on a collocation target.
Collocation target is an area on the Earth's surface at which
observations from at least two sensors are collected. Its size is
defined by the sensor with the largest FOV footprint. Collocation
scene's size is typically about twice the size of its collocation
target.
Units: mW m-2 sr-1 (cm-1)-1
18) toa_outgoing_spectral_radiance_stdev_within_collocation_scene
Standard deviation of toa_outgoing_spectral_radiance observations
within a collocation scene. Collocation scene is a grouping of
sensor's adjacent field of views (FOVs) centered on a collocation
target. Collocation target is an area on the Earth's surface at which
observations from at least two sensors are collected. Its size is
defined by the sensor with the largest FOV footprint. Collocation
scene's size is typically about twice the size of its collocation
target.
Units: mW m-2 sr-1 (cm-1)-1
19) constant_term_of_spectral_radiance_correction_due_to_intercalibration
Constant term (offset) of the formula for correcting measured spectral
radiance. The correction is derived from intercalibration between the
monitored and the reference sensor. The resulting corrected spectral
radiance of the monitored sensor becomes comparable with measured
spectral radiance of the reference sensor. "Spectral" means per unit
wavenumber or as a function of wavenumber. Radiance is the radiant
power per unit area in a particular direction per unit of solid angle.
Units: mW m-2 sr-1 (cm-1)-1
20) linear_term_of_spectral_radiance_correction_due_to_intercalibration
Linear term (slope) of the formula for correcting measured spectral
radiance. The correction is derived from intercalibration between the
monitored and the reference sensor. The resulting corrected spectral
radiance of the monitored sensor becomes comparable to measured
spectral radiance of the reference sensor. "Spectral" means per unit
wavenumber or as a function of wavenumber. Radiance is the radiant
power per unit area in a particular direction per unit of solid angle.
Units: 1
21) quadratic_term_of_spectral_radiance_correction_due_to_intercalibration
Quadratic term of the formula for correcting measured spectral
radiance. The correction is derived from intercalibration between the
monitored and the reference sensor. The resulting corrected spectral
radiance of the monitored sensor becomes comparable to measured
spectral radiance of the reference sensor. "Spectral" means per unit
wavenumber or as a function of wavenumber. Radiance is the radiant
power per unit area in a particular direction per unit of solid angle.
Units: mW-1 m2 sr cm-1
22) covariance_between_constant_and_linear_terms_of_spectral_radiance_correction
Covariance between
constant_term_of_spectral_radiance_correction_due_to_intercalibration
and linear_term_of_spectral_radiance_correction_due_to_intercalibration
values.
Units: mW m-2 sr-1 (cm-1)-1
23) toa_brightness_temperature_of_standard_scene
"toa" means top of atmosphere. Brightness temperature of a body is the
temperature of a black body which radiates the same power per unit
solid angle per unit area at a given wavenumber. Standard scene is a
target area with typical Earth surface and atmospheric conditions that
is accepted as a reference. The top-of-atmosphere radiance of the
standard scene is calculated using a radiative transfer model for a
given viewing geometry. The resultant top-of-atmosphere spectral
radiance is then integrated with a sensor's spectral response function
and converted to equivalent brightness temperature.
Units: K
24) toa_brightness_temperature_bias_at_standard_scene_wrt_intercalibration
The difference between top-of-atmosphere (TOA) brightness temperature
of the reference sensor and TOA brightness temperature of the
monitored sensor. This TOA brightness temperature difference is a
measure of the calibration difference between the monitored and
reference sensors. Standard scene is a target area with typical Earth
surface and atmospheric conditions that is accepted as a reference.
Brightness temperature of a body is the temperature of a black body
which radiates the same power per unit solid angle per unit area at a
given wavenumber. TOA brightness temperature of the standard scene is
calculated using a radiative transfer simulation for a given viewing
geometry. The resultant top-of-atmosphere spectral radiance is then
integrated with each sensor's spectral response function and converted
to equivalent brightness temperature.
Units: K
-Aleksandar
Received on Tue Nov 20 2012 - 07:34:28 GMT
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