Re: [CF-metadata] New standard_name: downward_air_velocity
Thanks, Jonathan - This makes perfect sense now. Instruments may output vertical velocity because the manufacturer doesn't know the orientation of the deployment in advance. It seems fine for the data writer to chose the appropriate name when publishing the data in CF. Thanks again - Nan On 3/1/16 10:42 AM, Jonathan Gregory wrote: Dear Nan Including upward/downward in the standard names of vertical components of vectors was a design decision when we started on the compiling the table, as with northward/southward, eastward/westward and any quantity which has a direction associated with it. Yes, there are other pairs where both senses have names. The reason is to make sure the sign convention is recorded. If it was a separate attribute, there's a reasonable chance it would not be included, or might be wrong. It sounds like you have a different use-case, with a sensor that measures a velocity component which isn't strictly vertical. We could give that a different name (i.e. component parallel to the instrument orientation, with again the need to indicate the sign convention somehow). Best wishes Jonathan - Forwarded message from Nan Galbraith <ngalbra...@whoi.edu> - Date: Tue, 1 Mar 2016 10:31:25 -0500 From: Nan Galbraith <ngalbra...@whoi.edu> To: cf-metadata@cgd.ucar.edu Subject: Re: [CF-metadata] New standard_name: downward_air_velocity User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 I agree, it's consistent, and may as well be added. That said, I'm not sure why we don't use 'vertical' for the vertical component of all these 3d velocity vectors, and then recommend an attribute that would specify the direction (up- or down-ward). I didn't have time to check whether we have any standard names that exist in both the upward and downward form ( I'm not really sure if that would be a problem, any way, but it seems like it might be). The reason this is important in my data is that some current meters and profilers output a vertical velocity where the direction depends on the orientation of the instrument. The vertical velocity is also a measure of measurement quality in those data sets, since excessive vertical values usually indicate an error in the other vectors. Cheers - Nan On 2/26/16 2:46 PM, Jonathan Gregory wrote: Dear Ken That looks good to me - clearly consistent with existing names. Best wishes Jonathan - Forwarded message from "Kehoe, Kenneth E." <kke...@ou.edu> - Date: Thu, 25 Feb 2016 20:31:31 + From: "Kehoe, Kenneth E." <kke...@ou.edu> To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> Subject: [CF-metadata] New standard_name: downward_air_velocity CF, Can we add downward_air_velocity to be the counter to the existing upward_air_velocity. Definition = A velocity is a vector quantity. “Downward" indicates a vector component which is positive when directed downward (negative upward). Downward air velocity is the vertical component of the 3D air velocity vector. Thanks, Ken -- *** * Nan GalbraithInformation Systems Specialist * * Upper Ocean Processes GroupMail Stop 29 * * Woods Hole Oceanographic Institution* * Woods Hole, MA 02543 (508) 289-2444 * *** ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata - End forwarded message - ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata -- *** * Nan GalbraithInformation Systems Specialist * * Upper Ocean Processes GroupMail Stop 29 * * Woods Hole Oceanographic Institution* * Woods Hole, MA 02543 (508) 289-2444 * *** ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Re: [CF-metadata] New standard_name: downward_air_velocity
Dear Ken and Jonathan, I agree that this name is entirely consistent with others in the table. I have added a sentence to the definition to cross-reference the existing name upward_air_velocity: downward_air_velocity (canonical units: m s-1) ' A velocity is a vector quantity. “Downward" indicates a vector component which is positive when directed downward (negative upward). Downward air velocity is the vertical component of the 3D air velocity vector. The standard name upward_air_velocity may be used for a vector component with the opposite sign convention.' This name is accepted for publication in the standard name table. I have also added a sentence to the definition of upward_air_velocity to cross-reference the new name: upward_air_velocity (canonical units: m s-1) ' A velocity is a vector quantity. "Upward" indicates a vector component which is positive when directed upward (negative downward). Upward air velocity is the vertical component of the 3D air velocity vector. The standard name downward_air_velocity may be used for a vector component with the opposite sign convention.' This change will be published in the standard name table at the same time as adding the new name. Best wishes, Alison -- Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: alison.pamm...@stfc.ac.uk STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Campus, Didcot, OX11 0QX, U.K. > -Original Message- > From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf > Of Jonathan Gregory > Sent: 26 February 2016 19:47 > To: cf-metadata@cgd.ucar.edu > Subject: [CF-metadata] New standard_name: downward_air_velocity > > Dear Ken > > That looks good to me - clearly consistent with existing names. > > Best wishes > > Jonathan > > - Forwarded message from "Kehoe, Kenneth E." <kke...@ou.edu> - > > > Date: Thu, 25 Feb 2016 20:31:31 + > > From: "Kehoe, Kenneth E." <kke...@ou.edu> > > To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> > > Subject: [CF-metadata] New standard_name: downward_air_velocity > > > > CF, > > > > Can we add downward_air_velocity to be the counter to the existing > upward_air_velocity. > > > > Definition = A velocity is a vector quantity. “Downward" indicates a vector > component which is positive when directed downward (negative upward). > Downward air velocity is the vertical component of the 3D air velocity > vector. > > > > Thanks, > > > > Ken > > > > > > > > Kenneth E. Kehoe > > Research Associate > > ARM Climate Research Facility Data Quality Office > > > > Office: 303-497-4754 > > Cell: 405-826-0299 > > > > > ___ > > CF-metadata mailing list > > CF-metadata@cgd.ucar.edu > > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > > - End forwarded message - > ___ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Re: [CF-metadata] New standard_name: downward_air_velocity
Dear Nan Including upward/downward in the standard names of vertical components of vectors was a design decision when we started on the compiling the table, as with northward/southward, eastward/westward and any quantity which has a direction associated with it. Yes, there are other pairs where both senses have names. The reason is to make sure the sign convention is recorded. If it was a separate attribute, there's a reasonable chance it would not be included, or might be wrong. It sounds like you have a different use-case, with a sensor that measures a velocity component which isn't strictly vertical. We could give that a different name (i.e. component parallel to the instrument orientation, with again the need to indicate the sign convention somehow). Best wishes Jonathan - Forwarded message from Nan Galbraith <ngalbra...@whoi.edu> - > Date: Tue, 1 Mar 2016 10:31:25 -0500 > From: Nan Galbraith <ngalbra...@whoi.edu> > To: cf-metadata@cgd.ucar.edu > Subject: Re: [CF-metadata] New standard_name: downward_air_velocity > User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:38.0) > Gecko/20100101 Thunderbird/38.6.0 > > I agree, it's consistent, and may as well be added. > > That said, I'm not sure why we don't use 'vertical' for the vertical > component of > all these 3d velocity vectors, and then recommend an attribute that > would specify > the direction (up- or down-ward). I didn't have time to check > whether we have > any standard names that exist in both the upward and downward form ( I'm > not really sure if that would be a problem, any way, but it seems > like it might be). > > The reason this is important in my data is that some current meters > and profilers > output a vertical velocity where the direction depends on the > orientation of the > instrument. The vertical velocity is also a measure of measurement > quality in those > data sets, since excessive vertical values usually indicate an error > in the other > vectors. > > Cheers - Nan > > On 2/26/16 2:46 PM, Jonathan Gregory wrote: > >Dear Ken > > > >That looks good to me - clearly consistent with existing names. > > > >Best wishes > > > >Jonathan > > > >- Forwarded message from "Kehoe, Kenneth E." <kke...@ou.edu> - > > > >>Date: Thu, 25 Feb 2016 20:31:31 + > >>From: "Kehoe, Kenneth E." <kke...@ou.edu> > >>To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> > >>Subject: [CF-metadata] New standard_name: downward_air_velocity > >> > >>CF, > >> > >>Can we add downward_air_velocity to be the counter to the existing > >>upward_air_velocity. > >> > >>Definition = A velocity is a vector quantity. “Downward" indicates a vector > >>component which is positive when directed downward (negative upward). > >>Downward air velocity is the vertical component of the 3D air velocity > >>vector. > >> > >>Thanks, > >> > >>Ken > >> > >> > > > -- > *** > * Nan GalbraithInformation Systems Specialist * > * Upper Ocean Processes GroupMail Stop 29 * > * Woods Hole Oceanographic Institution* > * Woods Hole, MA 02543 (508) 289-2444 * > *** > > > ___ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata - End forwarded message - ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Re: [CF-metadata] New standard_name: downward_air_velocity
I agree, it's consistent, and may as well be added. That said, I'm not sure why we don't use 'vertical' for the vertical component of all these 3d velocity vectors, and then recommend an attribute that would specify the direction (up- or down-ward). I didn't have time to check whether we have any standard names that exist in both the upward and downward form ( I'm not really sure if that would be a problem, any way, but it seems like it might be). The reason this is important in my data is that some current meters and profilers output a vertical velocity where the direction depends on the orientation of the instrument. The vertical velocity is also a measure of measurement quality in those data sets, since excessive vertical values usually indicate an error in the other vectors. Cheers - Nan On 2/26/16 2:46 PM, Jonathan Gregory wrote: Dear Ken That looks good to me - clearly consistent with existing names. Best wishes Jonathan - Forwarded message from "Kehoe, Kenneth E." <kke...@ou.edu> - Date: Thu, 25 Feb 2016 20:31:31 + From: "Kehoe, Kenneth E." <kke...@ou.edu> To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> Subject: [CF-metadata] New standard_name: downward_air_velocity CF, Can we add downward_air_velocity to be the counter to the existing upward_air_velocity. Definition = A velocity is a vector quantity. “Downward" indicates a vector component which is positive when directed downward (negative upward). Downward air velocity is the vertical component of the 3D air velocity vector. Thanks, Ken -- *** * Nan GalbraithInformation Systems Specialist * * Upper Ocean Processes GroupMail Stop 29 * * Woods Hole Oceanographic Institution* * Woods Hole, MA 02543 (508) 289-2444 * *** ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
[CF-metadata] New standard_name: downward_air_velocity
Dear Ken That looks good to me - clearly consistent with existing names. Best wishes Jonathan - Forwarded message from "Kehoe, Kenneth E." <kke...@ou.edu> - > Date: Thu, 25 Feb 2016 20:31:31 + > From: "Kehoe, Kenneth E." <kke...@ou.edu> > To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> > Subject: [CF-metadata] New standard_name: downward_air_velocity > > CF, > > Can we add downward_air_velocity to be the counter to the existing > upward_air_velocity. > > Definition = A velocity is a vector quantity. “Downward" indicates a vector > component which is positive when directed downward (negative upward). > Downward air velocity is the vertical component of the 3D air velocity vector. > > Thanks, > > Ken > > > > Kenneth E. Kehoe > Research Associate > ARM Climate Research Facility Data Quality Office > > Office: 303-497-4754 > Cell: 405-826-0299 > > ___ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata - End forwarded message - ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
[CF-metadata] New standard_name: downward_air_velocity
CF, Can we add downward_air_velocity to be the counter to the existing upward_air_velocity. Definition = A velocity is a vector quantity. “Downward" indicates a vector component which is positive when directed downward (negative upward). Downward air velocity is the vertical component of the 3D air velocity vector. Thanks, Ken Kenneth E. Kehoe Research Associate ARM Climate Research Facility Data Quality Office Office: 303-497-4754 Cell: 405-826-0299 ___ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
