Dear Aleksandar,
That sounds interesting because you are suggesting to introduce different quantities whether they are collocated or not. I've got two comments:
? Are you sure you need a standard name such as "time_label_iso8601"? I mean: isn't it possible to use "time" standard name instead? (And put somewhere that it is ISO 8601 compliant information, like in 'long name' attribute)
? In principle, you could consider that a collocated quantity is the same geophysical quantity that a non collocated one. But it is also true that identifying collocated quantities with CF attributes could ease some processes, when comparing temporal series. If we suppose that, how would you identify two quantities like eg "toa_outgoing_spectral_radiance_mean_within_collocation_target" that are defined by two different collocation targets?
Thanks Aleksandar!
Best regards,
Olivier.
-----Message d'origine-----
De : cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-bounces at cgd.ucar.edu] De la part de Aleksandar Jelenak
Envoy? : jeudi 7 octobre 2010 16:40
? : cf-metadata at cgd.ucar.edu
Objet : [CF-metadata] New standard names for satellite obs data
Dear all,
I am submitting 13 new standard names for acceptance in the official
list. I have tried to follow the convention's guidelines and used the
current standard names as examples.
The new names are developed to represent some common types of satellite
obs data. I welcome any suggestion on how to improve them.
1) "instrument_channel_identifier" [dimensionless]
Alphanumeric identifier of instrument's channel.
2) "time_label_iso8601" [dimensionless]
String containing date-time information in one of the ISO 8601
formats.
3) "instrument_zenith_angle" [degree]
The angle between the line of sight to the instrument and the local
vertical.
4) "satellite_scan_angle" [degree]
The angle between the line of sight from the satellite and the nadir
line. Nadir is the direction given by the vertical from the satellite
looking towards the center of the Earth.
5) "instrument_azimuth_angle" [degree]
The horizontal angle between the line of sight to the instrument and
a reference direction which is often due north. The angle is measured
clockwise.
6) "relative_instrument_azimuth_angle" [degree]
Difference between two instrument_azimuth_angle values.
7) "toa_outgoing_spectral_radiance" [mW m-2 sr-1 (cm-1)-1]
"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 radiative flux in a particular direction,
per unit of solid angle.
8) "collocation_time" [s]
A time line of events used as the temporal reference during
collocation processing. Collocation is grouping of at least two
observation events based on a set of criteria (typically spatial and
temporal).
9) "collocation_time_difference" [s]
The temporal difference between the monitored event and the reference
event being collocated. Collocation is grouping of at least two
observation events based on a set of criteria (typically spatial and
temporal).
10) "toa_outgoing_spectral_radiance_mean_within_collocation_target"
or
"average_of_toa_outgoing_spectral_radiance_within_collocation_target"
[mW m-2 sr-1 (cm-1)-1]
An average of toa_outgoing_spectral_radiance observations from
instrument'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 instruments are collected. Its size is
defined by the instrument with the largest field of view footprint.
11) "toa_outgoing_spectral_radiance_stdev_within_collocation_target"
or
"stdev_of_toa_outgoing_spectral_radiance_within_collocation_target"
[mW m-2 sr-1 (cm-1)-1]
Standard deviation of toa_outgoing_spectral_radiance observations
from instrument'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 instruments are collected. Its
size is defined by the instrument with the largest field of view
footprint.
12) "toa_outgoing_spectral_radiance_mean_within_collocation_scene"
or
"average_of_toa_outgoing_spectral_radiance_within_collocation_scene"
[mW m-2 sr-1 (cm-1)-1]
An average of toa_outgoing_spectral_radiance observations within a
collocation scene. Collocation scene is a grouping of instrument'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 instruments are collected. Its size is
defined by the instrument with the largest FOV footprint. Collocation
scene's size is typically about an order of magnitude larger than its
collocation target.
13) "toa_outgoing_spectral_radiance_stdev_within_collocation_scene"
or
"stdev_of_toa_outgoing_spectral_radiance_within_collocation_scene"
[mW m-2 sr-1 (cm-1)-1]
Standard deviation of toa_outgoing_spectral_radiance observations
within a collocation scene. Collocation scene is a grouping of
instrument'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 instruments are collected. Its
size is defined by the instrument with the largest FOV footprint.
Collocation scene's size is typically about an order of magnitude
larger than its collocation target.
-Aleksandar
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