Feat request: multi component observations

[hkershaw-brown]

Observations types that are components of a measurement need treating differently to regular obs types.

Example is U_WIND, V_WIND combined into horizontal wind

https://github.com/NCAR/DART/blob/c8ddfac035a39bbb24451ced3b0aa5410ac62494/assimilation_code/programs/obs_diag/threed_sphere/obs_diag.f90#L2940-L2942

https://github.com/NCAR/DART/blob/c8ddfac035a39bbb24451ced3b0aa5410ac62494/assimilation_code/programs/obs_diag/threed_sphere/obs_diag.f90#L2993-L3021

[hkershaw-brown]

defined in yaml?

acars_horizontal_wind:
  description: ACARS-derived Horizontal wind speed
  components:
    - acars_u_wind_component
    - acars_v_wind_component

sat_horizontal_wind:
  description: Satellite-derived horizontal wind speed
  components:
    - sat_u_wind_component
    - sat_v_wind_component

[hkershaw-brown]

note on duplicate observations. Will need to deal with these when finding matching component types.

number of each type of obs

duplicates where lat, lon, vertical, time & observation value matches. I feel like these are actual duplicates.

This is matches but not for observation value. Obs in the same place and time, same type, different observation value. 12544 out of 107212 sat_u_wind (10% ish). Different measurements of the same thing?

This is looking at the SAT_U_WIND_COMPENT dups. Sorted by latitude so you can see the dups a bit easier.