| Field | Type | Description | Units | Range
|
|---|
| !CMNT
| C80
| Comment record (starts with '!')
|
| Alt_Adj
| Float
| Adjusted/Corrected altitude of sweep
[1]
| km
| eg 58.4
|
| Alt_Rel
| Float
| Altitude of meas. relative to boresight
[2]
| km
| −15 : +15 expected
|
| AVH(NAVH)
| String*3
| (NAVH) AVHRR channel,
|
| ∈ { '1', '2', '3A', '3B', '4', '5' }
|
| Cld_Idx
| Float
| Cloud Index
[3]
|
| 0.0 if not set
|
| Cld_Pct
| Float
| Cloud Fraction
| %
| 0–100
|
| Cld_Rad
| Float
| Cloud Radiance
[3]
|
| 0.0 if not set
|
| Flt_Lab
| String*8
| Label of spectral filter channel
|
| eg 'HSDI_06'
|
| Flt_Noi
| Float
| Filter channel noise estimate
| [4]
| eg 0.001
|
| Format_ID
| Float
| L1C File Format identifier
[5]
|
| ≥ 3.2
|
| Grd(:)
| Float
| (NSwp)
Nominal tangent points of measurement boresight
| km
| 0 – 100 expected
|
| Grd_Type
| String*3
| Vertical coordinate for measurements (optional)
|
| ∈ { HGT, ELE, GEO }
|
| HMS
| Long
| Time of measurement in UT
| hhmmss
| eg 120001
|
| iFOV
| Integer
| Field-of-View counter
|
| 1 : 4 (IASI)
|
| Instrument
| String*10
| Instrument name (left justified)
|
| eg 'IASI-A'
|
| iScn
| Integer
| Scan counter within file
[6]
|
| 1 : NScn
|
| iStp
| Integer
| Step counter across swath
|
| 1 : 30 (IASI)
|
| iSwp
| Integer
| Sweep# of measurement
|
| 1 : NSwp
|
| Julian_Day
| Long
| Nom_Date as Day# since 1 Jan 2000 (=0)
|
| eg 8401 (1st Jan 2023)
|
| Lat
| Float
| Latitude of measurement
| deg N
| ±90
|
| Lnd_Pct
| R
| Land Fraction (as opposed to sea)
| %
| 0–100
|
| Lon
| R
| Longitude of measurement
| deg E
| −180 : +180
|
| LST
| Float
| Local solar time
| hr
| 0.0 (not set)
|
| Mic_Lab
| C8
| Label identifying microwindow
|
| eg 'HIROS_A'
|
| Mic_Min
| D
| Microwindow lower wavenumber limit
| cm-1
| eg 1135.20
|
| Mic_Max
| D
| Microwindow upper wavenumber limit
| cm-1
| eg 1136.20
|
| Mic_Noi
| R
| Microwindow average noise, or 0.0
|
[4]
| eg 0.01
|
| Mic_Npt
| I
| Number of spectral points for microwindow
|
| eg 1001
|
| Mos_X
| I
| x-index of mosaic containing measurement
[7]
|
| ≥ 1
|
| Mos_Y
| I
| y-index of mosaic containing measurement
[7]
|
| ≥ 1
|
| MSC
| Long
| Time of measurement in UT
| ms
| eg 43201000
|
| NAVH
| Int
| No. AVHRR channels included
|
| 0 : 5
|
| NBnd
| Integer
| No. spectral bands (microwindows)
|
| > 0
|
| NCLS
| Integer
| Max no. of AVHRR channel radiance clusters
|
| 7 expected
|
| NMic
| Integer
| No. Microwindows for sweep or No. filter measurements for image
|
| eg 3
|
| Nom_Date
| Long
| Nominal observation date
| yyyymmdd
| eg 20230101
|
| NPix
| Integer
| No. pixels (profile locations) in file
|
| > 0
|
| NScn
| Integer
| No. vertical scans/pixels within file
[6]
|
| ≥ 1 expected
|
| NSwp
| Integer
| No. spectral sweeps/measurement altitudes per scan (1 for nadir-viewing)
|
| > 0
|
| Orbit
| Long
| Satellite orbit number since launch
|
| > 0
|
| Rad(Mic_Npt)
| R
| Spectral radiance
| r.u.
|
| Rad_Crv
| D
| Earth Radius of Curvature in line-of-sight plane
| km
| 6300 – 6400 expected
|
| Resln
| Float
| Spectral resolution[10]
| cm-1
| ≥ 0
|
| Satellite
| String*10
| Satellite name (left justified)
|
| eg 'MetOp-A'
|
| SZA
| Float
| Solar Zenith Angle of measurement
| deg
| 90.0 expected
|
| Time_End
| Long
| End of measurement UT
| hhmmss
| eg 120000
|
| Time_Start
| Long
| Start of measurement UT
| hhmmss
| eg 134059
|
| Tra
| Float(Mic_Npt)
| Microwindow transmittance spectrum
| dimensionless
[8]
| eg 0.999955
|
| Tra_Flt
| Float
| Filter transmittance measurement
| dimensionless
[8]
| eg 0.998021
|
| View_ID
| Integer
| Viewing geometry[9]
|
| 1 : 5
|
| YMD
| Long
| Date of measurement
| yyyymmdd
| eg 20230101
|
| Zen
| R
| Satellite zenith angle
| deg
| 0–90
|