Table 5-02-01, add descriptions

[amilan17]

Initial request

add descriptions to existing codes, this was originally a part of issue #336

Amendment details

notation	path	name	description
190	/Atmosphere/Visual range/Remote-sensing, active/	Scatterometer	Visual range is calculated by measuring the return of light beam scattered by diffusion in air.
207	/Atmosphere/Visual range/Remote-sensing, active/	Transmissometer	Visual range is calculated by measuring the extinction coefficient of a beam of energy passing through a volume of air.
24	/Atmosphere/Clouds/	Human observation	Observation of clouds from the Earth's surface by a human observer (ref: https://cloudatlas.wmo.int/en/observation-of-clouds-from-the-earths-surface.html)

Comments

No response

Requestor(s)

TT-WIGOSMD

Stakeholder(s)

Enter list of stakeholder(s).

Publication(s)

Example: Manual on Codes (WMO-No. 306), Volume I.3, WMO Codes Registry

Expected impact of change

None

Collaborators

No response

References

No response

Validation

No response

[meulenvd]

Both definitions to be harmonized because the technology and methods are comparable.
Visual range is only used for aeronautical practices: Runway Visual Range (RVR); Visual Range is for human beings, but subjective because a human beings vision qualities is undefined. Therefore, for meteorology the term visibility is used, which is equal to meteoprological optical range (MOR), which is a physical variable and uniquely related to the exctintion coefficient

190 | /Atmosphere/Visual range/Remote-sensing, active/ | Scatterometer | Visual range is calculated by measuring the return of light beam scattered by diffusion in air.

proposal: Visual range is calculated by measuring the return of light beam scattered by diffusion in air. --> Visibility, determined from the relative amount of light scattered by a volume of air.

207 | /Atmosphere/Visual range/Remote-sensing, active/ | Transmissometer | Visual range is calculated by measuring the extinction coefficient of a beam of energy sent through a volume of air.

proposal: Visual range is calculated by measuring the extinction coefficient of a beam of energy sent through a volume of air. --> Visibility, determined from the relative amount of light passing a volume of air.

[joergklausen]

I support this, with maybe a slight addition: ... passing [through] a volume of air.

[meulenvd]

passing (through) is fine

[amilan17]

https://github.com/wmo-im/tt-wigosmd/wiki/2024.01.18-TT-WIGOSMD notes:

@meulenvd -- I updated the proposal. (see issue summary at the top). If these changes are approved by you and the team within a week or two, we can include this proposal in FT2024-1.

[meulenvd]

https://github.com/wmo-im/tt-wigosmd/wiki/2024.01.18-TT-WIGOSMD notes:

@meulenvd -- I updated the proposal. (see issue summary at the top). If these changes are approved by you and the team within a week or two, we can include this proposal in FT2024-1.

@amilan17 , @joergklausen - I think it's fine now.