Data quality control codes

Data Quality Control flags:

quality code	Description
0	ok

Code	Description	trigger
1	SCT	sct
2	SCT based on first-guess fields	sct_fg
3	SCT dual	sct_dual
10	buddy check	buddy
11	FGT	fgt
301	precipitation and temperature cross-check	ccrrt
501	plausibility test	always
502	climatological check	month.clim
800	isolated observation	isolation_check
901	missing data or metadata	always
902	DEM check	dem
999	blacklist
990	keeplist

Abbreviations stand for:

• SCT, Spatial consistency test
• FGT, First-guess test

The tests are applied sequentially according to the order in titan.r.

NOTE: quality codes can be specified by the user (see R/functions/argparser_qccodes.r).

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Special flags:

• 999 = blacklisted observation
• 990 = keeplisted observation (changed only by missing metadata or plausibility test)

  • the following tests are allowed to change the flag of an observation in the keeplist:

    • missing metadata
    • plausibility test failed

    keep-listed observations are used -when needed- in all the other tests (SCT, buddy-check,...) but they cannot be flagged as suspect observations, even if they fail the test