BEAT-II Record: SCIAMACHY_L1c_nadir

Fields

The table below gives an overview of possible fields that can be returned from an ingestion of SCIAMACHY_L1c_nadir data. The 'default' column indicates whether the specified data item is included in the ingestion by default or not. You can change which data items are ingested by making use of the include and exclude filter options (see below).

field name	type	dimensions	default	description
type	string		included	reference to the type of data in this record
elements_per_file	int32	[file]	included	List of number of ingested points per file
time	double	[main]	included	Measurement time
latitude	double	[main]	included	The center latitude for each nadir pixel
longitude	double	[main]	included	The center longitude for each nadir pixel
corner_latitude	double	[main, 4]	included	The corner latitudes for each nadir pixel
corner_longitude	double	[main, 4]	included	The corner longitudes for each nadir pixel
spectral_readout	double	[main, spectra]	included	The detector readout values
spectral_readout_unit	string		included	BU
spectral_radiance	double	[main, spectra]	included	The detector readout values
spectral_radiance_unit	string		included	photons/s.cm^2.sr.nm
wavelength	double	[main, spectra]	included	The nominal wavelength assignment for each of the detector pixels
wavelength_unit	string		included	nm
integration_time	double	[main]	included	The minimum readout time for all ingested clusters
pixel_integration_time	double	[main, spectra]	excluded	The readout time for each detector pixel
solar_zenith_angle	double	[main]	excluded	The solar zenith angle for each measurement
solar_azimuth_angle	double	[main]	excluded	The solar azimuth angle for each measurement
los_zenith_angle	double	[main]	excluded	The line of sight zenith angle for each measurement
los_azimuth_angle	double	[main]	excluded	The line of sight azimuth angle for each measurement
scan_direction	string	[main]	included	The scan direction for each measurement: 'forward', 'backward', or 'mixed' (for a measurement that consisted of one or more forward and backward scans)

Ingestion filter options

Ingestion filter options are passed as a ',' or ';' separated string to the ingestion function. Each filter option needs to be formulated as option_name=value[ value value] (some options accept more than one value). For example, if a product has filter options 'altitude_min' and 'time_min' you can provide a filter option string "latitude_min=30,time_min=2003-01-01" to get all measurements at or above 30km and on or after January 1st 2003.

option name	type	description
product_version	integer	If multiple product format versions for this product type exist, you can use this filter option to select from which ones data should be ingested (i.e. you can provide a space-separated list of allowed product format version numbers). The list of available version numbers for this product type can be found in the CODA Product Format Definitions documentation.
data	string	You should never have to provide this filter option, since this type of record is the default type of data that is ingested for a SCIAMACHY_L1c product. You can, however, still explicitly ask for this type of record by using the filter option data=nadir.
include	string	Provide a space-separated list of field names to ingest additional data items (i.e. fields that are not ingested by default). You can use the special case include=* to indicate that you want to ingest all available data items.
exclude	string	Provide a space-separated list of field names that you don't want ingested. Mind that the exclude filter is processed after the include filter.
time_min	time*	Only include elements for which the value is greater than or equal to the provided filter option value
time_max	time*	Only include elements for which the value is less than or equal to the provided filter option value
time	time*	Only include elements that match the list of given filter option values
latitude_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
latitude_max	double	Only include elements for which the value is less than or equal to the provided filter option value
latitude	double	Only include elements that match the list of given filter option values
longitude_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
longitude_max	double	Only include elements for which the value is less than or equal to the provided filter option value
longitude	double	Only include elements that match the list of given filter option values
integration_time_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
integration_time_max	double	Only include elements for which the value is less than or equal to the provided filter option value
integration_time	double	Only include elements that match the list of given filter option values
solar_zenith_angle_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
solar_zenith_angle_max	double	Only include elements for which the value is less than or equal to the provided filter option value
solar_zenith_angle	double	Only include elements that match the list of given filter option values
solar_azimuth_angle_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
solar_azimuth_angle_max	double	Only include elements for which the value is less than or equal to the provided filter option value
solar_azimuth_angle	double	Only include elements that match the list of given filter option values
los_zenith_angle_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
los_zenith_angle_max	double	Only include elements for which the value is less than or equal to the provided filter option value
los_zenith_angle	double	Only include elements that match the list of given filter option values
los_azimuth_angle_min	double	Only include elements for which the value is greater than or equal to the provided filter option value
los_azimuth_angle_max	double	Only include elements for which the value is less than or equal to the provided filter option value
los_azimuth_angle	double	Only include elements that match the list of given filter option values
scan_direction	string	Only include elements that match the list of given filter option values
wavelength_min	double	Only include data where the wavelength is greater then or equal to the value provided (in nm)
wavelength_max	double	Only include data where the wavelength is less than or equal to the value provided (in nm)

^* Time values can be passed as either 'yyyy-mm-dd', 'yyyy-mm-ddThh:mm:ss', 'yyyy-mm-ddThh:mm:ss.uuuuuu' or a floating point value indicating the amount of seconds since 2000-01-01 00:00:00.

Mapping description

Below a description is provided on how each data item in the ingested record was retrieved from the product.

field name	mapping description
time	path	/states[]/dsr_time
	description	the dsr_time is increased by the number of the applicable readout multiplied by the minimum readout time
latitude	path	/nadir[]/geo[]/center_coord/latitude
	description	the dsr is the dsr for the cluster with a readout time equal to the minimal readout time of all ingested clusters for that state
longitude	path	/nadir[]/geo[]/center_coord/longitude
	description	the dsr is the dsr for the cluster with a readout time equal to the minimal readout time of all ingested clusters for that state
corner_latitude	path	/nadir[]/geo[]/corner_coord[]/latitude
	description	the dsr is the dsr for the cluster with a readout time equal to the minimal readout time of all ingested clusters for that state. The corners are rearranged in the following way: 0,2,3,1
corner_longitude	path	/nadir[]/geo[]/corner_coord[]/longitude
	description	the dsr is the dsr for the cluster with a readout time equal to the minimal readout time of all ingested clusters for that state. The corners are rearranged in the following way: 0,2,3,1
spectral_readout	condition	/nadir[]/rad_units_flag == 0
	path	/nadir[]/observations[]
spectral_readout_unit	condition	/nadir[]/rad_units_flag == 0
	description	Will be set to "BU"
spectral_radiance	condition	/nadir[]/rad_units_flag == -1
	path	/nadir[]/observations[]
spectral_radiance_unit	condition	/nadir[]/rad_units_flag == -1
	description	Will be set to "photons/s.cm^2.sr.nm"
wavelength	path	/nadir[]/pixel_wavelength[]
wavelength_unit	description	Will be set to "nm"
integration_time	path	/states[]/intg_times[]
	description	The minimum readout time of only those clusters from which pixel data is ingested (the value can thus be higher than the minimum readout time for a state
pixel_integration_time	path	/states[]/clus_config[]/pet, /states[]/clus_config[]/coadd_factor
	description	For all pixels in a cluster the integration time is the pixel exposure time times the coadding factor
solar_zenith_angle	path	/nadir[]/geo[]/sol_zen_ang[1]
solar_azimuth_angle	path	/nadir[]/geo[]/sol_azi_ang[1]
los_zenith_angle	path	/nadir[]/geo[]/los_zen_ang[1]
los_azimuth_angle	path	/nadir[]/geo[]/los_azi_ang[1]
scan_direction	path	/nadir[]/geo[]/corner_coord[], /states[]/intg_times[]
	description	When the integration time is higher than 1s we are dealing with a mixed pixel, otherwise the scan direction is based on the corner coordinates of the first ground pixel of the measurement. The first geolocation pixel is a backscan pixel if the inproduct of the unit vector of the third corner with the outproduct of the unit vector of the first corner and the unit vector of the second corner is negative (otherwise it is part of a forward scan)