Re: [CF-metadata] Roms: ocean_s_coordinate_g1 and g2?

2012-07-18 Thread John Caron 

Ive updated the docs at

http://www.unidata.ucar.edu/software/netcdf-java/reference/StandardCoordinateTransforms.html 



Thanks for the report.

On 7/17/2012 11:52 PM, Heiko Klein wrote:

Rich,

it must have been the netcdf-java package where I have seen these 
standard-names. The description on the netcdf-java pages are outdated, 
still using formula_terms a and b. I just checked the code, and that 
is up to date working with the formula_term -array C(k).


It'll be good to have an official version. Thanks for picking this up 
again.


Heiko


On 2012-07-17 17:13, Rich Signell wrote:

Heiko,

We worked with John Caron several years ago to get these into the CDM
in the NetCDF-Java library, so if you have g1 or g2 coordinates they
will work with codes that use NetCDF-java (like the Matlab NCTOOLBOX
and Unidata's IDV),  and I remember we drafted up some documentation
to  submit to CF, but looks like we dropped the ball.I'll pick it
up again.

-Rich

On Mon, Jul 16, 2012 at 10:24 AM, Heiko Klein  
wrote:

Hi,

I'm currently working with ROMS ocean model files. The model uses a
generalized ocean_s coordinate as defined by
https://www.myroms.org/wiki/index.php/Vertical_S-coordinate .

The same page says that their s_coordinate is covered by standard_names
ocean_s_coordinate_g1
ocean_s_coordinate_g2
and I believe I have seen at least the g1 case in a draft of a CF 
convention
some month ago. Both cases are also implemented in the netcdf-java 
package

with above standard_names:
http://www.unidata.ucar.edu/software/netcdf-java/reference/StandardCoordinateTransforms.html 



But I cannot find any of those names any longer, neither in CF-1.6 
nor in

the standard_names tables.

Does somebody remember what happened to these vertical coordinates?
According to the ROMS Wiki, the standard_names have been added in March
2009.



Best regards,

Heiko
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Re: [CF-metadata] Standard names for sea level change

2012-07-18 Thread Jonathan Gregory 
Dear Olivier

I think

> 1.   tendency_of_global_average_sea_level_change (m/year)
> 2.   tendency_of_sea_surface_height_above_sea_level (m/year)

are both fine as proposed standard names.

> 3.   global_average_sea_level_change_amplitude (m)
> 4.   global_average_sea_level_change_phase (degree)

also make sense, but I would suggest instead

amplitude_of|phase_of_global_average_sea_level_change

because "transformations" (like tendency_of) in the guidelines uses prefixes.
It's easier to parse (in the sense of language) the names like that. Is that
all right? I think that both of these standard names would need a mandatory
coordinate (it could be a scalar coordinate) of harmonic_period (s) - that's
my suggestion for a new standard name. In your case, the period would be one
year. In addition, a phase would need a definition for zero. How should that
be defined?

Best wishes

Jonathan
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Re: [CF-metadata] Roms: ocean_s_coordinate_g1 and g2?

2012-07-18 Thread Heiko Klein 

Rich,

it must have been the netcdf-java package where I have seen these 
standard-names. The description on the netcdf-java pages are outdated, 
still using formula_terms a and b. I just checked the code, and that is 
up to date working with the formula_term -array C(k).


It'll be good to have an official version. Thanks for picking this up again.

Heiko


On 2012-07-17 17:13, Rich Signell wrote:

Heiko,

We worked with John Caron several years ago to get these into the CDM
in the NetCDF-Java library, so if you have g1 or g2 coordinates they
will work with codes that use NetCDF-java (like the Matlab NCTOOLBOX
and Unidata's IDV),  and I remember we drafted up some documentation
to  submit to CF, but looks like we dropped the ball.I'll pick it
up again.

-Rich

On Mon, Jul 16, 2012 at 10:24 AM, Heiko Klein  wrote:

Hi,

I'm currently working with ROMS ocean model files. The model uses a
generalized ocean_s coordinate as defined by
https://www.myroms.org/wiki/index.php/Vertical_S-coordinate .

The same page says that their s_coordinate is covered by standard_names
ocean_s_coordinate_g1
ocean_s_coordinate_g2
and I believe I have seen at least the g1 case in a draft of a CF convention
some month ago. Both cases are also implemented in the netcdf-java package
with above standard_names:
http://www.unidata.ucar.edu/software/netcdf-java/reference/StandardCoordinateTransforms.html

But I cannot find any of those names any longer, neither in CF-1.6 nor in
the standard_names tables.

Does somebody remember what happened to these vertical coordinates?
According to the ROMS Wiki, the standard_names have been added in March
2009.



Best regards,

Heiko
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Dr. Heiko Klein  Tel. + 47 22 96 32 58
Development Section / IT Department  Fax. + 47 22 69 63 55
Norwegian Meteorological Institute   http://www.met.no
P.O. Box 43 Blindern  0313 Oslo NORWAY
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Re: [CF-metadata] Standard names for sea level change

2012-07-18 Thread John Graybeal 
Sorry, I think there's a confusing point about item 4. The term wave in your 
definition has many definitions, including in physical oceanography (see 
http://en.wikipedia.org/wiki/Wave_(disambiguation) for a longer list). Can we 
clarify its use refers not to an oceanographic wave, but (presumably) to a wave 
function representing the rate of sea level change?  (Or does it actually 
relate to ocean waves? In which case I don't understand what it has to do with 
sea level change.)
 
John

On Jul 16, 2012, at 03:01, Lauret Olivier wrote:

>  
> Dear Jonathan,
>  
> I think following the previous exchanges
>  
> 1.   tendency_of_global_average_sea_level_change (m/year)
> Global average sea level change is due to change in volume of the water in 
> the ocean, caused by mass and/or density change, or to change in the volume 
> of the ocean basins, caused by tectonics etc. It is sometimes called 
> "eustatic", which is a term that also has other definitions. It differs from 
> the change in the global average sea surface height relative to the centre of 
> the Earth by the global average vertical movement of the ocean floor. Zero 
> sea level change is an arbitrary level. "tendency_of_X" means derivative of X 
> with respect to time.
>  
> 2.   tendency_of_sea_surface_height_above_sea_level (m/year)
> “Sea_level means mean sea level, which is close to the geoid in sea areas. 
> "Sea surface height" is a time-varying quantity. "tendency_of_X" means 
> derivative of X with respect to time.”
>  
>  
> 3.   global_average_sea_level_change_amplitude (m)
> “Global average sea level change is due to change in volume of the water in 
> the ocean, caused by mass and/or density change, or to change in the volume 
> of the ocean basins, caused by tectonics etc. It is sometimes called 
> "eustatic", which is a term that also has other definitions. It differs from 
> the change in the global average sea surface height relative to the centre of 
> the Earth by the global average vertical movement of the ocean floor. Zero 
> sea level change is an arbitrary level.  Amplitude is the magnitude of a wave 
> modeled by a sinusoidal function.”
>  
>  
> 4.   global_average_sea_level_change_phase (degree)
> “Global average sea level change is due to change in volume of the water in 
> the ocean, caused by mass and/or density change, or to change in the volume 
> of the ocean basins, caused by tectonics etc. It is sometimes called 
> "eustatic", which is a term that also has other definitions. It differs from 
> the change in the global average sea surface height relative to the centre of 
> the Earth by the global average vertical movement of the ocean floor. Zero 
> sea level change is an arbitrary level. Phase is the initial angle of a wave 
> modeled by a sinusoidal function.”
>  
> ..could be added as new standard names.
>  
> There is still one problem to be solved, it’s about  how to mention that it 
> is for example annual, or semi-annual, or 60 days amplitude and phase of the 
> signal. You suggested to precise it into coordinates variables and introduce 
> a standard name such as “harmonic_period”. Shall we use seconds units for 
> that quantity, which are canonical units?
> For the definition, CF already provides “A period is an interval of time, or 
> the time-period of an oscillation.”.
>  
> Thanks!
>  
> Olivier
>  
>  
> -Message d'origine-
> De : CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] De la part de 
> Jonathan Gregory
> Envoyé : jeudi 12 juillet 2012 15:57
> À : cf-metadata@cgd.ucar.edu
> Objet : Re: [CF-metadata] Standard names for sea level change
>  
> Dear Olivier
>  
> > Yes, 'tendency_of_sea_surface_height_above_sea_level' is fine for me. I 
> > confirm the "sea_level" part of the standard name is a time mean sea level.
>  
> Very good. Is this now the only new standard name you are proposing?
>  
> Cheers
>  
> Jonathan
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John Graybeal phone: 858-534-2162
Product Manager
Ocean Observatories Initiative Cyberinfrastructure Project: 
http://ci.oceanobservatories.org
Marine Metadata Interoperability Project: http://marinemetadata.org







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Re: [CF-metadata] Roms: ocean_s_coordinate_g1 and g2?

2012-07-18 Thread Rich Signell 
Heiko,

We worked with John Caron several years ago to get these into the CDM
in the NetCDF-Java library, so if you have g1 or g2 coordinates they
will work with codes that use NetCDF-java (like the Matlab NCTOOLBOX
and Unidata's IDV),  and I remember we drafted up some documentation
to  submit to CF, but looks like we dropped the ball.I'll pick it
up again.

-Rich

On Mon, Jul 16, 2012 at 10:24 AM, Heiko Klein  wrote:
> Hi,
>
> I'm currently working with ROMS ocean model files. The model uses a
> generalized ocean_s coordinate as defined by
> https://www.myroms.org/wiki/index.php/Vertical_S-coordinate .
>
> The same page says that their s_coordinate is covered by standard_names
>ocean_s_coordinate_g1
>ocean_s_coordinate_g2
> and I believe I have seen at least the g1 case in a draft of a CF convention
> some month ago. Both cases are also implemented in the netcdf-java package
> with above standard_names:
> http://www.unidata.ucar.edu/software/netcdf-java/reference/StandardCoordinateTransforms.html
>
> But I cannot find any of those names any longer, neither in CF-1.6 nor in
> the standard_names tables.
>
> Does somebody remember what happened to these vertical coordinates?
> According to the ROMS Wiki, the standard_names have been added in March
> 2009.
>
>
>
> Best regards,
>
> Heiko
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> CF-metadata mailing list
> CF-metadata@cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata



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Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598
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