Table 7-06 Level of Data

[amilan17]

Initial request

During the FT2023-1 NFP review, we received feedback that "CIMO" is still referenced in the descriptions of codes in table 7-06 for Level of Data.

Amendment details

updated 30 June 2023

notation	name	description	New description
level0	Level 0	CIMO: Analogue/digital electric signals.	Instrument and auxiliary data reconstructed from satellite raw data after removing communications artefacts. [source: GIMO (WMO-No. 8), volume IV]
		CEOS: Physical information: Reconstructed unprocessed instrument data at full space time resolution with all available supplemental information to be used in subsequent processing (e.g. ephemeris, health and safety) appended.
level1	Level I	CIMO: Level I data (Primary Data): in general, are instrument readings expressed in appropriate physical units, and referred to Earth geographical coordinates. They require conversion to the normal meteorological variables (identified in Part I, Chapter 1). Level I data themselves are in many cases obtained from the processing of electrical signals such as voltages, referred to as raw data. Examples of these data are satellite radiances and water-vapour pressure, positions of constant-level balloons, etc. but not raw telemetry signals. Level I data still require conversion to the meteorological parameters specified in the data requirements.	Level I data, in general, are instrument readings expressed in appropriate physical units, and referred to with geographical coordinates. They require conversion to the normal meteorological variables (identified in Part I, Chapter 1). Level I data themselves are in many cases obtained from the processing of electrical signals such as voltages, referred to as raw data. Examples of these data are satellite radiances and water-vapour pressure. [source: GIMO (WMO-No. 8) , volume V]
		CEOS: Physical information: Unpacked, reformatted level 0 data, with all supplemental information to be used in subsequent processing appended. Optional radiometric and geometric correction applied to produce parameters in physical units. Data generally presented as full time/space resolution. A wide variety of sub level products are possible.	Instrument data extracted, at full original resolution, with geolocation and calibration information. [source: GIMO (WMO-No. 8), volume IV]
level2	Level II	CIMO: Level II data (Meteorological parameters). They may be obtained directly from many kinds of simple instruments, or derived from Level I data. For example, a sensor cannot measure visibility, which is a Level II quantity; instead, sensors measure the extinction coefficient, which is a Level I quantity. NOTE: Data exchanged internationally are Level II or Level III data.	The data recognized as meteorological variables are Level II data. They may be obtained directly from instruments (as is the case for many kinds of simple instruments) or derived from Level I data. For example, a sensor cannot measure visibility, which is a Level II quantity; instead, sensors measure the extinction coefficient, which is a Level I quantity. [source: GIMO (WMO-No. 8) , volume V]
		CEOS: Geophysical information. Retrieved environmental variables (e.g., ocean wave height, soil moisture, ice concentration) at the same resolution and location as the level 1 source data.	Geophysical product retrieved from a single instrument in the original projection. [source: GIMO (WMO-No. 8), volume IV]
level3	Level III	CIMO: Level III (Initial state parameters) are internally consistent datasets, generally in grid-point form obtained from Level II data by applying established initialization procedures. NOTE: Data exchanged internationally are Level II or Level III data.*	Level III data are those contained in internally consistent datasets, generally in grid-point form*. They are not within the scope of the present Guide. Data exchanged internationally are Level II or Level III data. [source: GIMO (WMO-No. 8) , volume V]
		CEOS: Geophysical information. Data or retrieved environmental variables which have been spatially and/or temporally re-sampled (i.e., derived from level 1 or 2 products). Such re-sampling may include averaging and compositing.	Geophysical product retrieved from a single instrument, mapped on uniform space and time grid scales, possibly on a multi-orbital (for LEO) or multi-temporal (for GEO) basis. Irreversible process due to resampling. [source: GIMO (WMO-No. 8), volume IV]
level4	Level IV	CEOS: Thematic information. Model output or results from analyses of lower level data (i.e., variables that are not directly measured by the instruments, but are derived from these measurements).	Composite multi-sensor and/or multi-satellite products; or result of model analysis. [source: GIMO (WMO-No. 8), volume IV]
raw	Raw	CEOS: Physical information: Data in their original packets, as received from a satellite
unknown	unknown	The value is unknown or missing.
inapplicable	inapplicable	None of the codes in the table are applicable in the context of this particular observation.

Comments

No response

Requestor(s)

James Lunny, NFP for Codes and Data Representation Matters Met Service, New Zealand

Stakeholder(s)

Enter list of stakeholder(s).

Publication(s)

Example: Manual on Codes (WMO-No. 306), Volume I.3, WMO Codes Registry, Code table 7-06, Level of Data,http://codes.wmo.int/wmdr/LevelOfData

Expected impact of change

LOW

Collaborators

No response

References

No response

Validation

No response