Hi,
The mailing list takes out the HTML for the tables I submitted in the message
so I've reformatted them:
The following names are used to identify data acquired from satellites in the
CF satellite standard names conventions.
Name ----- Alternative Name ----- Comment
satellite -- platform ------------ The object on which the instruments/sensors
are attached.
instrument -- sensor -------------- The observing device, mounted on the
satellite/platform.
detector --------------------------- The element of the instrument observing a
specific band.
Band ------- channel --------------- The spectral region covered by the
observation. Channel may be used as a subset within a band.
Phrase ----------------- Meaning, Please provide a better definition if you can.
satellite_point -------- The absolute latitude and longitude of the
satellite/platform.
measurement_point ------ The geo-referenced latitude and longitude onto a
standard coordinate system where the measurement is taken.
Toa -------------------- top of atmosphere, see Surface in the Qualifications
section for more information.
Other suggestions are welcome.
Sorry for the inconvenience.
Regards,
Pete.
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1. Re: cf-satellite Digest, Vol 28, Issue 10 (Peter Miu)
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Message: 1
Date: Wed, 13 Mar 2013 15:53:52 +0100
From: Peter Miu <Peter.Miu@xxxxxxxxxxxx>
To: "cf-satellite@xxxxxxxxxxxxxxxx" <cf-satellite@xxxxxxxxxxxxxxxx>
Subject: Re: [cf-satellite] cf-satellite Digest, Vol 28, Issue 10
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Hi,
As mentioned in my Email 2 weeks ago, I attended the annual GSICS joint meeting
attended by EUMETSAT, NOAA, NASA, CMA, JMA, and KMA; note our work here is
visible to the WMO and CGMS. We discussed the process for submitting CF
satellite standard name proposals and the already submitted proposed satellite
CF standard names by NOAA and EUMETSAT, and here is what I can report.
Based on our experience, the submission of satellite CF standard name proposals
is a long, difficult and frustrating process. Feedback is often received that
leave the proposed CF updates in limbo as questions, opinions and taste are
presented that do not have an answer or solution without further discussion.
In addition to this, the concept of providing a satellite vocabulary in the
standard names guidelines would help with defining and clarifying the proposed
satellite standard names.
Therefore I suggest the following:
1. Feedback to proposals shall provide comments/opinions AND possible solutions
to the issues raised in these comments/opinions to allow the submissions to be
promptly reworked. Feedback leading to limbo state can be ignored (I?m sorry
for the bluntness of this suggestion but we have to be efficient and pragmatic
in how to use our time).
2. The following terms shall be included in the Guidelines for Construction of
CF Standard Names
(see: http://cf-pcmdi.llnl.gov/documents/cf-standard-names/guidelines). I
suggest a new section under Chemical Species called ?Satellite Names and
Phrases?
Satellite Names and Phrases
The following names are used to identify data acquired from satellites in the
CF satellite standard names conventions.
Name
Alternative Name
Comment
satellite
platform
The object on which the instruments/sensors are attached.
instrument
sensor
The observing device, mounted on the satellite/platform.
detector
The element of the instrument observing a specific band.
band
channel
The spectral region covered by the observation.
Channel may be used as a subset within a band.
Phrase
Meaning ? Please provide a better definition if you can.
satellite_point
The absolute latitude and longitude of the satellite/platform.
measurement_point
The geo-referenced latitude and longitude onto a standard coordinate system
where the measurement is taken.
toa
top of atmosphere ? see Surface in the Qualifications section for more
information.
Other suggestions are welcome.
For the proposed names submitted by EUMETSAT, the re-worked versions are to
split them into 3 separate submissions to allow easier acceptance and these are
as follows:
Submission 1 (Satellite / Platform related):
azimuth_angle
* degrees
* Azimuth angle is the angle measured towards the east, from north, along
the astronomical horizon to the intersection of the great circle passing
through the point and the astronomical zenith with the astronomical horizon.
platform_measurement_latitude
* degrees_north
* Latitude of the data acquired at the measurement point ? coordinate system
shall be defined in the variable comment attribute.
platform_measurement_longitude
* degrees_east
* Longitude of the data acquired at the measurement point ? coordinate
system shall be defined in the variable comment attribute.
platform_measurement_altitude
* m
* Altitude of the platform above mean sea level.
Submission 2 (Band related):
band_spectral_width
* cm-1
* Bandwidth of the spectral channel taken by the detector Submission 3 (Top
of Atmosphere related):
toa_spectral_irradiance
* mW m-2 (cm-1)-1
* Irradiance which is relevant for any sensor measuring in the UV-VIS and
NIR. This parameter is reported by integrating over the whole sphere.
toa_spectral_reflectance
* 1 (dimensionless)
* Ratio of radiance to irradiance I/I0, reflection from a thick layer where
the layer, here the atmosphere, is part of the reflection's property.
toa_outgoing_inband_radiance
* mW m-2 sr-1
* "outgoing" means emitted toward outer space; the radiance is integrated
over a discrete band.
toa_reflectance
* 1
* Reflectance is the ratio of the energy of the reflected to the incident
radiation at the top of atmosphere. A coordinate variable of
radiation_wavelength or radiation_frequency can be used to specify the
wavelength or frequency respectively, of the radiation.
If no major issues (note issues should come with suggested solutions) on the
proposals have been received within two weeks, I will assume we as a community
think the proposals would benefit users and developers of satellite data, and I
shall submit them for official acceptance.
Regards,
Peter Miu
Data Services Operations Engineer
EUMETSAT
EUMETSAT Allee 1
64295 Darmstadt
Germany
Tel: +49 6151 807 3290
Fax: +49 6151 807 7410
Email: peter.miu@xxxxxxxxxxxx<mailto:peter.miu@xxxxxxxxxxxx>
Web: http://www.eumetsat.int
Follow EUMETSAT on Twitter https://twitter.com/@eumetsat_users
Ordering Data from EUMETSAT https://eoportal.eumetsat.int/
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1. Re: cf-satellite Digest, Vol 28, Issue 9 (Peter Miu)
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Message: 1
Date: Wed, 27 Feb 2013 09:55:22 +0100
From: Peter Miu <Peter.Miu@xxxxxxxxxxxx<mailto:Peter.Miu@xxxxxxxxxxxx>>
To: "'cf-satellite@xxxxxxxxxxxxxxxx'"
<cf-satellite@xxxxxxxxxxxxxxxx<mailto:cf-satellite@xxxxxxxxxxxxxxxx>>
Subject: Re: [cf-satellite] cf-satellite Digest, Vol 28, Issue 9
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Hi all,
Just to provide you with an update.
I have received inputs on the proposed CF standard names and units from:
- Mike Grant.
- Jim Biard.
- Randy Horne.
I am attending the GSICS joint meeting next week and I shall discuss the
proposals and these inputs with the GSICS Data working group members (NOAA,
NASA, JMA, CMA, KMA, etc.). I will then compile updates, discuss these with
our EUMETSAT WMO representative and present it on this list again before
submission to the CF TRAC (expected due date is mid - end of March).
Regards,
Peter Miu.
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1. Re: cf-satellite Digest, Vol 28, Issue 5 (Mike Grant)
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Message: 1
Date: Fri, 22 Feb 2013 19:20:38 +0000
From: Mike Grant <mggr@xxxxxxxxx<mailto:mggr@xxxxxxxxx>>
To: Jim Biard <jim.biard@xxxxxxxx<mailto:jim.biard@xxxxxxxx>>
Cc: "cf-satellite@xxxxxxxxxxxxxxxx<mailto:cf-satellite@xxxxxxxxxxxxxxxx>"
<cf-satellite@xxxxxxxxxxxxxxxx<mailto:cf-satellite@xxxxxxxxxxxxxxxx>>
Subject: Re: [cf-satellite] cf-satellite Digest, Vol 28, Issue 5
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On 20/02/13 17:52, Jim Biard wrote:
This issue with altitude is exactly why it is critical to include the
geographic coordinate system used - both the horizontal and vertical
datum. That's where the issue lies. It's not with the concept of
altitude, per se.
This is the key point, but I think it's perhaps one that's a general issue for the CF
guys to sort out rather than something we need to deal with when proposing a standard
name. One could include a short snippet in the description along the lines of "For
this variable to be meaningful, it must be associated with a {horizontal|vertical}
datum.".
Again, one should approach this point carefully as it's likely to cause a
torrent of discussion and bog that name down in a swamp of difficulties. At
the least, try to isolate it from others or, if the discussion starts, try your
hardest to separate the datum issue into another thread separate from the name
proposal!
This can be quite a mess to navigate through, and I appreciate you and
Aleksandar's (and others!) efforts to develop these standard names!
Hear hear!
Cheers,
Mike.
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