New descriptor for OLCI classification and quality; BUFRCREX_CodeFlag_en_40.csv

[marijanacrepulja]

Initial request

Proposal for the new BUFR descriptor to represent OLCI classification and quality. This is to support assimilation of the OLCI data in NWP models.

https://sentinels.copernicus.eu/documents/247904/4812102/S3IPF%20PDS%20004.1%20-%20i2r5%20-%20Product%20Data%20Format%20Specification%20-%20OLCI%20Level%201.pdf/0f4a2cab-171b-e240-8b7e-d4d6410db762

Amendment details

1. Add a new element in table B 0-40-081 for OLCI classification and quality

F X Y	ELEMENT NAME	UNIT	SCALE	REFERENCE VALUE	DATA WITH (bits)
0-40-081	OLCI Level 1 classification and quality	Flag table	0	0	31

2. Add a new CODE/FLAG TABLE 0-40-081 for OLCI Level 1 classification and quality

Bit No	OLCI Level 1 classification and quality
1 - 17	Reserved
18	Land
19	Coastline
20	Fresh inland water
21	Tidal regions
22	Preliminary Cloud
23	Stray light risk
24	Invalid
25	Cosmetic
26	Duplicated
27	Sun glint risk
28	Dubious
29	Saturated
30	Partly saturated
All 31	Missing

3. Add to abbreviation table
OLCI - Ocean and Land Colour Instrument

Comments

No response

Requestor(s)

Enter list of requestors.

Stakeholder(s)

Copernicus EU
Copernicus Atmosphere Monitoring Service (CAMS)

Publication(s)

Example: Manual on Codes (WMO-No. 306), Volume I.2, BUFR, BUFRCREX_CodeFlag_en_40.csv

Expected impact of change

MEDIUM

Collaborators

No response

References

No response

Validation

No response

[amilan17]

https://github.com/wmo-im/tt-tdcf/wiki/2024.10.15.tt.tdcf notes:

• add link to documentation in issue
• add OLCI to abbreviation table
• Jeff recommends using bits 16-30 to optimize compression
• change units to flag table from numeric (typo)
• create sample for validation

[marijanacrepulja]

olci.zip
Sample BUFR file and decoded message

[amilan17]

https://github.com/wmo-im/tt-tdcf/wiki/2024.11.13.tt.tdcf notes:

• Marijana updated the proposal based on feedback from last meeting and added samples
• @marijanacrepulja will update the branch
• @antoinemerle will validate