Table B 01: New BUFR descriptor for light source identifier

[marijanacrepulja]

Summary and purpose

ECMWF is proposing new BUFR descriptor for light source identifier.

Stakeholders

Marijana Crepulja, Antje Inness, Roberto Ribas (all from ECMWF)

Action proposed

The team is kindly asked to review and approve the contents for inclusion within the next update to the WMO Manual on Codes.

Discussions

ECMWF is preparing for assimilation of Altius ozone observations. In order to identify different light sources we need a new descriptor.

Detailed proposal

1. Add a new entry and corresponding note in the identification class of table B (0-01-145) and a new code table to describe light source

F X Y	ELEMENT NAME	UNIT	SCALE	REFERENCE VALUE	DATA WITH (bits)
0-01-145	Light source identifier	Numeric	0	-8	20

NOTE: Positive value corresponds to Hipparcos identifier, 0 is Sun, -2 is Venus, -4 is Mars, -5 is Jupiter, -6 is Saturn, -7 is Earth's moon, -8 is Bright limb

[amilan17]

Re: https://github.com/wmo-im/CCT/wiki/Teleconference-26-and-28.4.2022

In progress, discussion over new descriptor and meaning of the values. Marijana to add explanatory note, linking to the Hipparcos catalogue.

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference-18-and-19.5.2022 notes:

note is added in issue summary, change -7 to 'Earth's moon'

[amilan17]

@marijanacrepulja please add the note and use temporary note ID: issue109

https://github.com/wmo-im/BUFR4/blob/issue109/notes/BUFRCREX_TableB_notes.csv

[marijanacrepulja]

@amilan17 I have added the note. Not sure if it is correct way of doing it. Could you please review and move to "Ready to FT " I am happy to add changes if need be. Thanks

It would be good we go through the process of adding the note at the meeting next week, so we all agree and know it.

[amilan17]

https://github.com/wmo-im/CCT/wiki/Teleconference-8.6.2022 notes:

@amilan17 validate for FT readiness

[amilan17]

@marijanacrepulja I made some note revisions, does it still make sense? 

"In descriptor 0 01 145, the positive values correspond to Hipparcos identifiers where 0 is Sun, -2 is Venus, -4 is Mars, -5 is Jupiter, -6 is Saturn, -7 is Earth's moon, and -8 is Bright limb."

[marijanacrepulja]

@amilan17
"0 is Sun, -2 is Venus, -4 is Mars, -5 is Jupiter, -6 is Saturn, -7 is Earth's moon, and -8 is Bright limb" are not part of the Hipparcos identifiers. The Hipparcos Identifier is Star ID.