HYPERNETS Product variables

The different L0A-L2B NetCDF files contain a range of different variables and metadata. The different product levels are detailed in HYPERNETS Product files. There are a number of main measurands (such as radiance, irradiance, reflectance, water-leaving radiance,…), which each have uncertainty variables for each of the components described in Uncertainty Propagation as well as error-correlation variables for the systematic uncertainty components.

In addition to these there are coordinate variables, wavelength and series/scans, as well as a number of common variables (i.e. present in each of the data products) that provide additional details about the measurement. Acquisition time, viewing zenith and azimuth angle, solar zenith and azimuth angle are examples of common variables with series or scans as dimension. Bandwidth is also a common variable which has the wavelength dimension. Then there are a few additional variables such as the quality flag variable and variables specifying the number of valid and total VNIR scans and specifying the number of valid and total SWIR scans (for the LANDHYPERNET network). The quality flag field consists of 32 bits. Every bit is related to the absence or presence of a flag as described in Flags description.

There are also a number of variables that are only present in some of the data products. For example, there is some additional information in the L0A files, such as integration times, values of the accelerometers, the requested and returned pan/tilt angles. This information is propagated to the L1A and L0B files, but not beyond.

A full list of the available variables is provided in Table 1.

Table 1: Table of variables. The variables listed as common are present in all product files

Level	network	variable_name	dimensions	Description	units
common	both	wavelength	wavelength	wavelength as determined from lab calibration of HYPSTAR instrument	nm
common	both	scan/series	wavelength	index of each series/scan in the file (counting from 0)	nm
common	both	bandwidth	wavelength	bandwidth FWHM assuming a Gaussian SRF	nm
common	both	viewing_azimuth_angle	series/scan	viewing_azimuth_angle is the horizontal angle between the line of sight from the observation point to the sensor and True North. The angle is measured clockwise positive starting from the North direction.	degrees
common	both	pointing_azimuth_angle	series/scan	pointing_azimuth_angle is the horizontal angle between the direction the sensor is pointing to and True North. The angle is measured clockwise positive starting from True North direction. This angle is 180 degrees different from the viewing_azimuth_angle.	degrees
common	both	viewing_zenith_angle	series/scan	viewing_zenith_angle is the vertical angle between the local zenith and the direction from the location being measured to the sensor. This angle is measured starting from directly overhead and its range is from zero (directly overhead the observation target i.e. sensor looking down) to 180 degrees (directly below the observation target i.e. sensor pointing at local zenith).	degrees
common	both	solar_azimuth_angle	series/scan	solar_azimuth_angle is the horizontal angle between the line of sight to the sun and True North. The angle is measured clockwise.	degrees
common	both	solar_zenith_angle	series/scan	solar_zenith_angle is the vertical angle between the line of sight to the sun and the local zenith. This angle is measured starting from directly overhead and its range is from zero (directly overhead the observation target i.e. sensor looking down) to 180 degrees (directly below the observation target i.e. sensor pointing at local zenith).	degrees
common	both	solar_zenith_angle	series/scan	Acquisition time in seconds since 1970-01-01 00:00:00	s
common	both	series_id	series/scan	Series id number
common	both	quality_flag	series/scan	The quality flag field consists of 32 bits. Every bit is related to the absence or presence of a a flag where each bit encodes a flag given in the flag_meanings attribute
L0A_RAD	both	integration_time	scan	Integration time during measurement	s
L0A_RAD	both	temperature	scan	temperature of instrument	degrees C
L0A_RAD	both	digital_number	wavelength & scan	Digital number of raw data
L0A_RAD	both	acceleration_x_mean	scan	acceleration_x_mean
L0A_RAD	both	acceleration_x_std	scan	acceleration_x_std
L0A_RAD	both	acceleration_y_mean	scan	acceleration_y_mean
L0A_RAD	both	acceleration_y_std	scan	acceleration_y_std
L0A_RAD	both	acceleration_z_mean	scan	acceleration_z_mean
L0A_RAD	both	acceleration_z_std	scan	acceleration_z_std
L0A_RAD	both	paa_ref	scan	pan (pointing azimuth angle) from pt_ref in metadata	degrees
L0A_RAD	both	paa_abs	scan	pan (pointing azimuth angle) from pt_abs in metadata	degrees
L0A_RAD	both	paa_ask	scan	pan (pointing azimuth angle) from pt_ask in metadata	degrees
L0B_RAD	both	integration_time	series	Integration time during measurement	s
L0B_RAD	both	temperature	series	temperature of instrument	degrees C
L0B_RAD	both	digital_number	wavelength & series	Digital number of raw data
L0B_RAD	both	u_rel_random_digital_number	wavelength & series	random relative uncertainty on digital number	%
L0B_RAD	both	dark_signal	wavelength & series	digital number for dark signal
L0B_RAD	both	u_rel_random_dark_signal	wavelength & series	random relative uncertainty on digital number for dark signal	%
L0B_RAD	both	n_valid_scans	series	number of valid scans used in average of VNIR
L0B_RAD	both	n_total_scans	series	number of total scans acquired for VNIR
L0B_RAD	both	std_digital_number	wavelength & series	standard deviation on digital number
L0B_RAD	both	std_dark_signal	wavelength & series	standard deviation on dark signal
L0B_RAD	both	acceleration_x_mean	series	acceleration_x_mean
L0B_RAD	both	acceleration_x_std	series	acceleration_x_std
L0B_RAD	both	acceleration_y_mean	series	acceleration_y_mean
L0B_RAD	both	acceleration_y_std	series	acceleration_y_std
L0B_RAD	both	acceleration_z_mean	series	acceleration_z_mean
L0B_RAD	both	acceleration_z_std	series	acceleration_z_std
L0B_RAD	both	paa_ref	scan	pan (pointing azimuth angle) from pt_ref in metadata	degrees
L0B_RAD	both	paa_abs	scan	pan (pointing azimuth angle) from pt_abs in metadata	degrees
L0B_RAD	both	paa_ask	scan	pan (pointing azimuth angle) from pt_ask in metadata	degrees
L1A_RAD	both	radiance	wavelength & scan	upwelling radiance	mW m^-2 nm^-1 sr^-1
L1A_RAD	both	u_rel_random_radiance	wavelength & scan	random relative uncertainty on upwelling radiance	%
L1A_RAD	both	u_rel_systematic_indep_radiance	wavelength & scan	the systematic relative uncertainty component on upwelling radiance that is not correlated with radiance	%
L1A_RAD	both	u_rel_systematic_corr_rad_irr_radiance	wavelength & scan	random relative uncertainty on upwelling radiance	%
L1A_RAD	both	err_corr_systematic_indep_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is not correlated with radiance
L1A_RAD	both	err_corr_systematic_corr_rad_irr_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is correlated with radiance
L1A_RAD	both	acceleration_x_mean	scan	acceleration_x_mean
L1A_RAD	both	acceleration_x_std	scan	acceleration_x_std
L1A_RAD	both	acceleration_y_mean	scan	acceleration_y_mean
L1A_RAD	both	acceleration_y_std	scan	acceleration_y_std
L1A_RAD	both	acceleration_z_mean	scan	acceleration_z_mean
L1A_RAD	both	acceleration_z_std	scan	acceleration_z_std
L1A_RAD	both	paa_ref	scan	pan (pointing azimuth angle) from pt_ref in metadata	degrees
L1A_RAD	both	paa_abs	scan	pan (pointing azimuth angle) from pt_abs in metadata	degrees
L1A_RAD	both	paa_ask	scan	pan (pointing azimuth angle) from pt_ask in metadata	degrees
L1A_IRR	both	irradiance	wavelength & scan	downwelling irradiance	mW m^-2 nm^-1
L1A_IRR	both	u_rel_random_irradiance	wavelength & scan	random relative uncertainty on downwelling irradiance	%
L1A_IRR	both	u_rel_systematic_indep_irradiance	wavelength & scan	the systematic relative uncertainty component on downwelling irradiance that is not correlated with radiance	%
L1A_IRR	both	u_rel_systematic_corr_rad_irr_irradiance	wavelength & scan	random relative uncertainty on downwelling irradiance	%
L1A_IRR	both	err_corr_systematic_indep_irradiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on irradiance that is not correlated with radiance
L1A_IRR	both	err_corr_systematic_corr_rad_irr_irradiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on irradiance that is correlated with radiance
L1A_IRR	both	acceleration_x_mean	scan	acceleration_x_mean
L1A_IRR	both	acceleration_x_std	scan	acceleration_x_std
L1A_IRR	both	acceleration_y_mean	scan	acceleration_y_mean
L1A_IRR	both	acceleration_y_std	scan	acceleration_y_std
L1A_IRR	both	acceleration_z_mean	scan	acceleration_z_mean
L1A_IRR	both	acceleration_z_std	scan	acceleration_z_std
L1A_IRR	both	paa_ref	scan	pan (pointing azimuth angle) from pt_ref in metadata	degrees
L1A_IRR	both	paa_abs	scan	pan (pointing azimuth angle) from pt_abs in metadata	degrees
L1A_IRR	both	paa_ask	scan	pan (pointing azimuth angle) from pt_ask in metadata	degrees
L1B_RAD	both	radiance	wavelength & series	upwelling radiance	mW m^-2 nm^-1 sr^-1
L1B_RAD	both	u_rel_random_radiance	wavelength & series	random relative uncertainty on upwelling radiance	%
L1B_RAD	both	u_rel_systematic_indep_radiance	wavelength & series	the systematic relative uncertainty component on upwelling radiance that is not correlated with radiance	%
L1B_RAD	both	u_rel_systematic_corr_rad_irr_radiance	wavelength & series	random relative uncertainty on upwelling radiance	%
L1B_RAD	both	err_corr_systematic_indep_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is not correlated with radiance
L1B_RAD	both	err_corr_systematic_corr_rad_irr_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is correlated with radiance
L1B_RAD	both	n_valid_scans	series	number of valid scans used in average of VNIR
L1B_RAD	both	n_total_scans	series	number of total scans acquired for VNIR
L1B_RAD	L	n_valid_scans_SWIR	series	number of valid scans used in average of SWIR
L1B_RAD	L	n_total_scans_SWIR	series	number of total scans acquired for SWIR
L1B_RAD	both	std_radiance	wavelength & series	standard deviation on upwelling radiance	mW m^-2 nm^-1 sr^-1
L1B_RAD	both	acceleration_x_mean	series	acceleration_x_mean
L1B_RAD	both	acceleration_x_std	series	acceleration_x_std
L1B_RAD	both	acceleration_y_mean	series	acceleration_y_mean
L1B_RAD	both	acceleration_y_std	series	acceleration_y_std
L1B_RAD	both	acceleration_z_mean	series	acceleration_z_mean
L1B_RAD	both	acceleration_z_std	series	acceleration_z_std
L1B_IRR	both	irradiance	wavelength & series	downwelling irradiance	mW m^-2 nm^-1
L1B_IRR	both	u_rel_random_irradiance	wavelength & series	random relative uncertainty on downwelling irradiance	%
L1B_IRR	both	u_rel_systematic_indep_irradiance	wavelength & series	the systematic relative uncertainty component on downwelling irradiance that is not correlated with radiance	%
L1B_IRR	both	u_rel_systematic_corr_rad_irr_irradiance	wavelength & series	random relative uncertainty on downwelling irradiance	%
L1B_IRR	both	err_corr_systematic_indep_irradiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on irradiance that is not correlated with radiance
L1B_IRR	both	err_corr_systematic_corr_rad_irr_irradiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on irradiance that is correlated with radiance
L1B_IRR	both	n_valid_scans	series	number of valid scans used in average of VNIR
L1B_IRR	both	n_total_scans	series	number of total scans acquired for VNIR
L1B_IRR	L	n_valid_scans_SWIR	series	number of valid scans used in average of SWIR
L1B_IRR	L	n_total_scans_SWIR	series	number of total scans acquired for SWIR
L1B_IRR	both	std_irradiance	wavelength & series	standard deviation on downwelling irradiance	mW m^-2 nm^-1
L1B_IRR	both	acceleration_x_mean	series	acceleration_x_mean
L1B_IRR	both	acceleration_x_std	series	acceleration_x_std
L1B_IRR	both	acceleration_y_mean	series	acceleration_y_mean
L1B_IRR	both	acceleration_y_std	series	acceleration_y_std
L1B_IRR	both	acceleration_z_mean	series	acceleration_z_mean
L1B_IRR	both	acceleration_z_std	series	acceleration_z_std
L1C_ALL	W	upwelling_radiance	wavelength & scan	upwelling radiance	mW m^-2 nm^-1 sr^-1
L1C_ALL	W	u_rel_random_upwelling_radiance	wavelength & scan	random relative uncertainty on upwelling radiance	%
L1C_ALL	W	u_rel_systematic_indep_upwelling_radiance	wavelength & scan	the systematic relative uncertainty component on upwelling radiance that is not correlated with radiance	%
L1C_ALL	W	u_rel_systematic_corr_rad_irr_upwelling_radiance	wavelength & scan	random relative uncertainty on upwelling radiance	%
L1C_ALL	W	err_corr_systematic_indep_upwelling_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is not correlated with radiance
L1C_ALL	W	err_corr_systematic_corr_rad_irr_upwelling_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is correlated with radiance
L1C_ALL	W	std_upwelling_radiance	wavelength & scan	standard deviation on upwelling radiance	mW m^-2 nm^-1 sr^-1
L1C_ALL	W	downwelling_radiance	wavelength & scan	downwelling radiance	mW m^-2 nm^-1 sr^-1
L1C_ALL	W	u_rel_random_downwelling_radiance	wavelength & scan	random relative uncertainty on downwelling radiance	%
L1C_ALL	W	u_rel_systematic_indep_downwelling_radiance	wavelength & scan	the systematic relative uncertainty component on downwelling radiance that is not correlated with radiance	%
L1C_ALL	W	u_rel_systematic_corr_rad_irr_downwelling_radiance	wavelength & scan	random relative uncertainty on downwelling radiance	%
L1C_ALL	W	err_corr_systematic_indep_downwelling_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is not correlated with radiance
L1C_ALL	W	err_corr_systematic_corr_rad_irr_downwelling_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on radiance that is correlated with radiance
L1C_ALL	W	std_downwelling_radiance	wavelength & scan	standard deviation on downwelling radiance	mW m^-2 nm^-1 sr^-1
L1C_ALL	W	irradiance	wavelength & scan	downwelling irradiance	mW m^-2 nm^-1
L1C_ALL	W	u_rel_random_irradiance	wavelength & scan	random relative uncertainty on downwelling irradiance	%
L1C_ALL	W	u_rel_systematic_indep_irradiance	wavelength & scan	the systematic relative uncertainty component on downwelling irradiance that is not correlated with radiance	%
L1C_ALL	W	u_rel_systematic_corr_rad_irr_irradiance	wavelength & scan	random relative uncertainty on downwelling irradiance	%
L1C_ALL	W	err_corr_systematic_indep_irradiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on irradiance that is not correlated with radiance
L1C_ALL	W	err_corr_systematic_corr_rad_irr_irradiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic error component on irradiance that is correlated with radiance
L1C_ALL	W	std_irradiance	wavelength & scan	standard deviation on downwelling irradiance	mW m^-2 nm^-1
L1C_ALL	W	rhof	scan	Fraction of downwelling sky radiance reflected at the air-water interface
L1C_ALL	W	rhof_wind	scan	Surface wind speed used for the retrieval of the fraction of downwelling sky radiance reflected at the air-water interface	ms^-1
L1C_ALL	W	rhof_sza	scan	Solar zenith angle used for the retrieval of the fraction of downwelling sky radiance reflected at the air-water interface	degrees
L1C_ALL	W	rhof_raa	scan	Relative azimuth angle from sun to sensor (0° when sun and sensor are aligned 180° when the sensor is looking into the sunglint) used for the retrieval of the fraction of downwelling sky radiance reflected at the air-water interface	degrees
L1C_ALL	W	rhof_vza	scan	Sensor zenith angle used for the retrieval of the fraction of downwelling sky radiance reflected at the air-water interface	degrees
L1C_ALL	W	reflectance	wavelength & scan	Reflectance of the water column at the surface with correction for the NIR similarity spectrum (see Ruddick et al. 2006)
L1C_ALL	W	u_rel_random_reflectance	wavelength & scan	random relative uncertainty on reflectance	%
L1C_ALL	W	u_rel_systematic_reflectance	wavelength & scan	the systematic relative uncertainty component on reflectance	%
L1C_ALL	W	err_corr_systematic_reflectance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on reflectance
L1C_ALL	W	water_leaving_radiance	wavelength & scan	water-leaving radiance of electromagnetic radiation (unspecified single wavelength) from the water body by cosine-collector radiometer	mW m^-2 nm^-1 sr^-1
L1C_ALL	W	u_rel_random_water_leaving_radiance	wavelength & scan	random relative uncertainty on water_leaving_radiance	%
L1C_ALL	W	u_rel_systematic_indep_water_leaving_radiance	wavelength & scan	the systematic relative uncertainty component on water_leaving_radiance for the component for which errors are not correlated between radiance and irradiance	%
L1C_ALL	W	err_corr_systematic_indep_water_leaving_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on the water_leaving_radiance for the component for which errors are not correlated between radiance and irradiance
L1C_ALL	W	u_rel_systematic_corr_rad_irr_water_leaving_radiance	wavelength & scan	the systematic relative uncertainty component on water_leaving_radiance for the component for which errors are correlated between radiance and irradiance	%
L1C_ALL	W	err_corr_systematic_corr_rad_irr_water_leaving_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on the water_leaving_radiance for the component for which errors are correlated between radiance and irradiance
L1C_ALL	W	reflectance_nosc	wavelength & scan	Reflectance of the water column at the surface without correction for the NIR similarity spectrum (see Ruddick et al. 2006)
L1C_ALL	W	u_rel_random_reflectance_nosc	wavelength & scan	random relative uncertainty on reflectance_nosc	%
L1C_ALL	W	u_rel_systematic_reflectance_nosc	wavelength & scan	the systematic relative uncertainty component on reflectance_nosc	%
L1C_ALL	W	err_corr_systematic_reflectance_nosc	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on reflectance_nosc
L1C_ALL	W	epsilon	wavelength & scan	Similarity spectrum ratio at two wavelengths see Ruddick et al. (2016)
L1C_ALL	W	u_rel_random_epsilon	wavelength & scan	random relative uncertainty on epsilon	%
L1C_ALL	W	u_rel_systematic_epsilon	wavelength & scan	the systematic relative uncertainty component on epsilon	%
L1C_ALL	W	err_corr_systematic_epsilon	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on epsilon
L2A_REF/L2B_REF	L	reflectance	wavelength & series	hemispherical-conical reflectance factor
L2A_REF/L2B_REF	L	u_rel_random_reflectance	wavelength & series	random relative uncertainty on hemispherical-conical reflectance factor	%
L2A_REF/L2B_REF	L	u_rel_systematic_reflectance	wavelength & series	the systematic relative uncertainty component on hemispherical-conical reflectance factor	%
L2A_REF/L2B_REF	L	err_corr_systematic_reflectance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on the hemispherical-conical reflectance factor
L2A_REF/L2B_REF	L	n_valid_scans	series	number of valid radiance scans used in average of VNIR
L2A_REF/L2B_REF	L	n_total_scans	series	number of total radiance scans acquired for VNIR
L2A_REF/L2B_REF	L	n_valid_scans_SWIR	series	number of valid radiance scans used in average of SWIR
L2A_REF/L2B_REF	L	n_total_scans_SWIR	series	number of total radiance scans acquired for SWIR
L2A_REF/L2B_REF	L	std_reflectance	wavelength & series	standard deviation on hemispherical-conical reflectance factor
L2A_REF/L2B_REF	W	reflectance	wavelength & series	Reflectance of the water column at the surface with correction for the NIR similarity spectrum (see Ruddick et al. 2006)
L2A_REF/L2B_REF	W	u_rel_random_reflectance	wavelength & series	random relative uncertainty on reflectance	%
L2A_REF/L2B_REF	W	u_rel_systematic_reflectance	wavelength & series	the systematic relative uncertainty component on reflectance	%
L2A_REF/L2B_REF	W	err_corr_systematic_reflectance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on reflectance
L2A_REF/L2B_REF	W	water_leaving_radiance	wavelength & series	water-leaving radiance of electromagnetic radiation (unspecified single wavelength) from the water body by cosine-collector radiometer	mW m^-2 nm^-1 sr^-1
L2A_REF/L2B_REF	W	u_rel_random_water_leaving_radiance	wavelength & series	random relative uncertainty on water_leaving_radiance	%
L2A_REF/L2B_REF	W	u_rel_systematic_indep_water_leaving_radiance	wavelength & series	the systematic relative uncertainty component on water_leaving_radiance for the component for which errors are not correlated between radiance and irradiance	%
L2A_REF/L2B_REF	W	err_corr_systematic_indep_water_leaving_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on the water_leaving_radiance for the component for which errors are not correlated between radiance and irradiance
L2A_REF/L2B_REF	W	u_rel_systematic_corr_rad_irr_water_leaving_radiance	wavelength & series	the systematic relative uncertainty component on water_leaving_radiance for the component for which errors are correlated between radiance and irradiance	%
L2A_REF/L2B_REF	W	err_corr_systematic_corr_rad_irr_water_leaving_radiance	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on the water_leaving_radiance for the component for which errors are correlated between radiance and irradiance
L2A_REF/L2B_REF	W	reflectance_nosc	wavelength & series	Reflectance of the water column at the surface without correction for the NIR similarity spectrum (see Ruddick et al. 2006)
L2A_REF/L2B_REF	W	u_rel_random_reflectance_nosc	wavelength & series	random relative uncertainty on reflectance_nosc	%
L2A_REF/L2B_REF	W	u_rel_systematic_reflectance_nosc	wavelength & series	the systematic relative uncertainty component on reflectance_nosc	%
L2A_REF/L2B_REF	W	err_corr_systematic_reflectance_nosc	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on reflectance_nosc
L2A_REF/L2B_REF	W	epsilon	wavelength & series	Similarity spectrum ratio at two wavelengths see Ruddick et al. (2016)
L2A_REF/L2B_REF	W	u_rel_random_epsilon	wavelength & series	random relative uncertainty on epsilon	%
L2A_REF/L2B_REF	W	u_rel_systematic_epsilon	wavelength & series	the systematic relative uncertainty component on epsilon	%
L2A_REF/L2B_REF	W	err_corr_systematic_epsilon	wavelength & wavelength	Error-correlation matrix between wavelengths for the systematic uncertainty on epsilon
L2A_REF/L2B_REF	W	rhof	wavelength & series	Fraction of downwelling sky radiance reflected at the air-water interface
L2A_REF/L2B_REF	W	n_valid_scans	series	number of valid radiance scans used in average of VNIR
L2A_REF/L2B_REF	W	n_total_scans	series	number of total radiance scans acquired for VNIR
L2A_REF/L2B_REF	L	std_reflectance	wavelength & series	standard deviation on reflectance that is due to the variability in radiance (i.e. not accounting for variability in darks or in irradiance)
L2A_REF/L2B_REF	L	std_water_leaving_radiance	wavelength & series	standard deviation on water leaving radiance that is due to the variability in radiance (i.e. not accounting for variability in darks or in irradiance)	mW m^-2 nm^-1 sr^-1
L2A_REF/L2B_REF	L	std_reflectance_nosc	wavelength & series	standard deviation on reflectance_nosc that is due to the variability in radiance (i.e. not accounting for variability in darks or in irradiance)
L2A_REF/L2B_REF	L	std_epsilon	wavelength & series	standard deviation on epsilon that is due to the variability in radiance (i.e. not accounting for variability in darks or in irradiance)