Table D, new BUFR Template for representation of UAS

[marijanacrepulja]

Initial request

New BUFR template is develop to represent observations from UAS (Uncrewed Aircraft Systems). That is in support to UAS campaign and in collaboration with WMO TT-UAS.

Amendment details

3 11 013		Uncrewed Aircraft Systems	Note
301150	WIGOS station id
001008	Aircraft/platform identifier
001095	Observation identification
301011	YEAR, MONTH, DAY
301013	HOUR,MINUTE, SECOND
301021	Latitude/longitude (high accuracy)
001013	Speed of motion of moving observing platform
008009	Detailed phase of flight
007010	Flight Level
033003	Quality information
011001	Wind direction
011002	Wind speed
012101	Temperature/ air temperature
002170	Aircraft humidity sensor
201144	Change data width
202133	Change scale
013002	Mixing ratio
202000	Change scale	Cancel
201000	Change data width	Cancel
201135	Change data width
202130	Change scale
013003	Relative humidity
202000	Change scale	Cancel
201000	Change data width	Cancel
011073	Turbulent kinetic energy
011075	Mean turbulence intensity (eddy dissipation rate)

Comments

No response

Requestor(s)

Alexander Cresst (DWD), Marijana Crepulja (ECMWF), Simon Elliot (EUMETSAT)

Stakeholder(s)

UAS community

https://community.wmo.int/en/uas-demonstration

Publication(s)

Example: Manual on Codes (WMO-No. 306), Volume I.2, BUFR table D

Expected impact of change

None

Collaborators

WMO TT-UAS

References

No response

Validation

No response

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference.2&3May.2023 notes: Marijana presented proposal; Sibylle recommends using something more precise than 013002 from the AMDAR template and move WIGOSID to beginning of sequence (done); @SibylleK will validate, but is only available in July; @jbathegit will validate also;

[SimonElliottEUM]

@jbathegit @SibylleK @amilan17 I will also support some validation if you like

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference.6.7.June.2023 notes: @marijanacrepulja still needs to create samples; still needs feedback on mixing ratio (013002);

[SibylleK]

@marijanacrepulja what kind of feedback you are waiting for?

My recommendation, more precisely was: In the AMDAR (version 7) template, i.e. sequence 311010 the mixing ratio and the relative humidity are used as follows:

FXY2	ElementName_en	ElementDescription_en
201144	Change data width
202133	Change scale
013002	Mixing ratio
202000	Change scale	Cancel
201000	Change data width	Cancel
201135	Change data width
202130	Change scale
013003	Relative humidity
202000	Change scale	Cancel
201000	Change data width	Cancel

Wouldn't it be good to have the same precision in the UAS template, to be on the safe side?

[marijanacrepulja]

bufr_sample_UAS.tar.zip

@SibylleK, @jbathegit, @SimonElliottEUM Please find attached sample BUFR file and dump output of the UAS sample data. Thank you for your help.

@SibylleK I was waiting UAS sample data in netCDF and info about expected values for mixing ration. They advise that water vapor mixing ratio values range from close to zero to 50 g kg-1. I am happy to include the same precision in the UAS template as it is done for AMDAR. Therefore, I have updated proposal and branch accordingly. Thank you for your suggestion.

[jbathegit]

@marijanacrepulja it looks like the file you posted is a gzip file, not a zip file. I got errors when I tried to unzip it, but then on a whim I tried renaming it to .gz instead of .zip and then it worked with gunzip.

[jbathegit]

And with that I was able to successfully read and decode the 20230327030016_Lat_46.812245_Lon_6.944007.nc.new.bufr file. I didn't check all 349 data subsets, but the ones I did spot-check matched up to the values in your corresponding .txt file.

So I would consider this a successful validation of the new 3-11-013 sequence.

[marijanacrepulja]

@marijanacrepulja it looks like the file you posted is a gzip file, not a zip file. I got errors when I tried to unzip it, but then on a whim I tried renaming it to .gz instead of .zip and then it worked with gunzip.

@jbathegit I apologise for inconvenience. I most likely rename it so that I can upload it to gitHub.

Many thanks for your help with validation.

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference.13.July.2023 notes:

@SimonElliottEUM @SibylleK validate within a week and ready to go if no feedback

[SibylleK]

I have successfully validated the example BUFR using the new sequence of the branch. (There was a typo for 033003. I corrected that in the branch.)

Here the output of the DWD bufr reading software: 20230327030016_Lat_46.812245_Lon_6.944007.nc.new.bufr.DWDreadbufrxOutput.zip

The values are the same as in the ECMWF output.

[amilan17]

Thank you @SibylleK !