GOM_PR2_AX_GADS_parameters_v1

binary record ""

size: 619

field name

definition

nfcr

binary uint8	size: 1
Chromatic refraction mode for the measured transmission. 0 = no correction; 1 = correction performed.

nfcr2

binary array[2]

size: 2

Chromatic refraction mode for transmission model. The first parameter is for the second spectral inversion and the second one is for the third and subsequent spectral inversions. 0 = no correction; 1 = correction performed.

nfi

binary array[2]

size: 2

Instrument function mode for the transmission model. The first parameter is for the second spectral inversion and the second one is for the third and subsequent spectral inversions. 0 = no correction; 1 = correction performed.

nfv

binary uint8	size: 1
Vertical inversion mode. 0 = spectrial inversion global (no GDI); 1 = spectral inversion global GDI NO2; 2 = spectral inversion global GDI NO2+NO3 (default)

nfs

binary uint8	size: 1
Smoothing mode (after the spectral inversion). 0 = no smoothing; 1 = gaussian filter; 2 = Tikhonov's regularisation.

nft

binary array[2]

size: 2

Time mode in the transmission model. The first parameter is for the second spectral inversion and the second one is for the third and subsequent spectral inversions. 0 = zero order term; 1 = second order term.

natm_b

binary uint8	size: 1
Choice of atmospheric model for SPB (O2 and H2O transmissions). 0 = US 76 standard; 1 = model dependent on season and latitude

max_obl

binary float	size: 4
Maximum value of the occultation obliquity unit: "degrees"

spare_1

binary bytes	size: 8
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hidden: true

id_earth

binary uint8	size: 1
Identifier of Earth model. 0: WGS84 model.

f_e

binary float	size: 4
Flattening of the Earth

a_e

binary uint32 (double)	size: 4
Earth equatorial radius unit: "m" converted unit: "m" ()

delta_h

binary float	size: 4
Atmosphere thickness unit: "m"

spare_2

binary bytes	size: 8
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max_dev

binary uint8	size: 1
Maximum number of iterations for the deviation computation

thr_dev

binary float	size: 4
Threshold value for the ray deviation computation unit: "degrees"

first_alt_rt

binary float	size: 4
First altitude step for the ray tracing unit: "m"

alt_step_rt

binary float	size: 4
Altitude step for the ray tracing unit: "m"

alt_samp

binary float	size: 4
Altitude sampling for density second derivative calculation unit: "m"

max_impact

binary uint8	size: 1
Maximum number of iterations for impact parameter computation

prec_impact

binary float	size: 4
Precision for impact parameter computation unit: "m"

min_wl_rt

binary uint32 (double)	size: 4
Minimum wavelength value for ray-tracing unit: "1e-3 nm" converted unit: "m" (multiply by 1/1000)

max_wl_rt

binary uint32 (double)	size: 4
Maximum wavelength value for ray-tracing unit: "1e-3 nm" converted unit: "m" (multiply by 1/1000)

spare_3

binary bytes	size: 8
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alt_turb

binary array[2]

size: 8

Altitude range for turbulence fluctuations processing

corwin

binary float	size: 4
Length of the cross-correlation window unit: "m"

spare_4

binary bytes	size: 8
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hidden: true

alt_ref

binary uint8	size: 1
Number of altitudes for reference line density. Working parameter used to decode the reference line density ADS.

natm

binary uint8	size: 1
Choice of atmospheric model for SPA (reference line density). 0 = US 76 standard' 1 = model dependent on latitude and season.

air_model

binary uint8	size: 1
Air reference line density computation model. 0 = 'compute from level-1B data'; 1 = 'use atmospheric model selected in preceding field'.

tot_species_a

binary uint8	size: 1
Total number of species for spectrometer A

num_groups_init_a

binary uint8	size: 1
Number of species groups (initialization phase)

num_groups

binary uint8	size: 1
Number of species groups (spectral inversion phase)

num_alt_win

binary uint8	size: 1
Number of altitudes for spectral windows

hanning_cut

binary float	size: 4
Hanning filter cut-off frequency (half extent) unit: "m"

time_delay_comp

binary float	size: 4
Time sampling for the time delay computation unit: "ms"

air_density

binary float	size: 4
Air number density at sea level unit: "1/cm3"

aero_model

binary uint8	size: 1
Aerosol model selection. 0 = '[1/lambda] model'; 1 = 'polynomial model'.

aero_model_order

binary uint8	size: 1
Order of the polynomial aerosol model

aerosol_mod

binary array[2]

size: 8

Aerosol model coefficients (unit: 1/cm3, -)

doas_size

binary uint16	size: 2
DOAS sliding window size in pixels

max_chi2

binary float	size: 4
Maximum value of Chi^2 before a warning flag is raised

num_zones_tik

binary uint8	size: 1
Number of atmosphere zones per gas for Tikhonov regularization

altitudes_for_tik

binary array[10]

size: 40

Altitudes for Tikhonov regularisation

reg_param_air

binary array[10]

size: 40

Regularisation parameter for air

reg_param_aerosol

binary array[10]

size: 40

Regularisation parameter for aerosol

reg_param_o3

binary array[10]

size: 40

Regularisation parameter for O3

reg_param_no2

binary array[10]

size: 40

Regularisation parameter for NO2

reg_param_no3

binary array[10]

size: 40

Regularisation parameter for NO3

reg_param_o2

binary array[10]

size: 40

Regularisation parameter for O2

reg_param_h2o

binary array[10]

size: 40

Regularisation parameter for H2O

reg_param_oclo

binary array[10]

size: 40

Regularisation parameter for OClO

spare_5

binary bytes	size: 20
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turbulence_params

binary record

size: 40

Turbulence parameters

field name

definition

kappa

binary float	size: 4
Threshold value on fluctuations level for turbulent computation

dt1

binary float	size: 4
Window width for correlation computation unit: "ms"

dtmin

binary float	size: 4
Minimum value for time delay to compute meaningful refractivity unit: "ms"

unused_parameters

binary array[7]

size: 28

Unused Parameters

vert_length_scale

binary float	size: 4
Characteristic vertical length scale: half width at half maximum unit: "m"

neg_density_flag

binary int16	size: 2
Flag for negative densities in LMA. 0 = no; 1 = yes.

photo_flag

binary int16	size: 2
Photometer flag. 0 = blue; 1 = red (scintillation processing).

min_trans

binary float	size: 4
Minimum value for transmission terms

max_trans

binary float	size: 4
Maximum value for transmission terms

min_ot

binary float	size: 4
Minimum value for optical thickness

max_ot

binary float	size: 4
Maximum value for optical thickness

min_col_den

binary float	size: 4
Minimum value for tangent line densities unit: "1/cm2"

max_col_den

binary float	size: 4
Maximum value for tangent line densities unit: "1/cm2"

min_loc_den

binary float	size: 4
Minimum value for local densities unit: "1/cm3"

max_loc_den

binary float	size: 4
Maximum value for local densities unit: "1/cm3"

max_alt_h2o

binary float	size: 4
Maximum altitude for H2O retrieval unit: "m"

scale_factor_spectral

binary int8	size: 1
Scale factor (spectral inversion) for the elements of the covariance matrix written in the level 2 product. The covariance matrix terms are divided by 10^FS before being written into the product.

scale_factor_vertical

binary int8	size: 1
Scale factor (vertical inversion) for the elements of the covariance matrix written in the level 2 product. The covariance matrix terms are divided by 10^FVM before being written into the product.

spare_7

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hidden: true