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Description

The Spectro-polarimeter for Planetary Exploration one (SPEXone) instrument flying aboard the PACE spacecraft is a multi-angle polarimeter. It measures the intensity, Degree of Linear Polarization (DoLP) and Angle of Linear Polarization (AoLP) of sunlight reflected back from Earth's atmosphere, land surface, and ocean. The focus of the SPEXone development is to achieve a very high accuracy of DoLP measurements, which facilitates accurate characterization of aerosols in the atmosphere. The Ocean Biology DAAC produces near real-time (quicklook) products using the best-available combination of ancillary data from meteorological and ozone data. As such, the inputs and the calibration used are less than optimal. Quicklook products provide a snapshot of the data during a short time period within a single orbit.

Version Description

Reprocessing of Ocean Color (OC) Datasets

Product Summary

Platforms
PACE
Instruments
SPEXone
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2024-02-25 to Present
Data Partner
Ocean Biology Processing Group (OBPG) ,
Ocean Biology Distributed Active Archive Center (OB.DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/GCDC/OB.DAAC)
Concept ID
C3555840000-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
15898
Processing Level
2
Published
Updated
Science Keywords
Ocean Color

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
diagnostic_data/aot550_first_guess First guess of aerosol optical thickness at 550 nm N/A float32 -32767 N/A N/A
diagnostic_data/aot550_mode1_first_guess First guess of aerosol optical thickness (mode 1) N/A float32 -32767 N/A N/A
diagnostic_data/aot550_mode2_first_guess First guess of aerosol optical thickness (mode 2) N/A float32 -32767 N/A N/A
diagnostic_data/aot550_mode3_first_guess First guess of aerosol optical thickness (mode 3) N/A float32 -32767 N/A N/A
diagnostic_data/bpdf_scale_first_guess First guess of bi-directional surface polarization distribution function scaling parameter N/A float32 -32767 N/A N/A
diagnostic_data/chi2 Cost function value N/A float32 -32767 N/A N/A
diagnostic_data/chi2_first_guess Cost function value of the first guess N/A float32 -32767 N/A N/A
diagnostic_data/chla_first_guess First guess of Chlorophyll-a concentration mg m^-3 float32 -32767 N/A N/A
diagnostic_data/cloud_fraction The cloud fraction N/A float32 -32767 N/A N/A
diagnostic_data/f_isotropic_first_guess First guess of surface isotropic scaling parameter for each band N/A float32 -32767 N/A N/A
diagnostic_data/iteration Number of iterations N/A int32 -32767 N/A N/A
diagnostic_data/li_sparse_first_guess First guess of bi-directional surface reflectance distribution function li-sparse kernel coefficient N/A float32 -32767 N/A N/A
diagnostic_data/no2 NO2 column density molecules cm^-2 float32 -32767 N/A N/A
diagnostic_data/nview Number of viewing angles N/A int32 -32767 N/A N/A
diagnostic_data/ozone Ozone column density Dobson float32 -32767 N/A N/A
diagnostic_data/quality_flag Quality of retrieved pixels (0: good) N/A int32 -32767 N/A N/A
diagnostic_data/refr_coefs_mode1 Coefficients of components for refractive index (mode 1) N/A float32 -32767 N/A N/A
diagnostic_data/refr_coefs_mode2 Coefficients of components for refractive index (mode 2) N/A float32 -32767 N/A N/A
diagnostic_data/refr_coefs_mode3 Coefficients of components for refractive index (mode 3) N/A float32 -32767 N/A N/A
diagnostic_data/ross_thick_first_guess First guess of bi-directional surface reflectance distribution function ross-thick kernel coefficient N/A float32 -32767 N/A N/A
diagnostic_data/snow_coef_first_guess First guess of bi-directional surface reflectance distribution function snow kernel coefficient N/A float32 -32767 N/A N/A
diagnostic_data/surface_pressure Surface pressure mb float32 -32767 N/A N/A
diagnostic_data/timing Retrieval time per pixel seconds float32 -32767 N/A N/A
diagnostic_data/water_albedo_correction_first_guess First guess of surface water albedo correction term for each band N/A float32 -32767 N/A N/A
diagnostic_data/wind_speed_first_guess First guess of ocean wind speed m/s float32 -32767 N/A N/A
geolocation_data/fracday The fraction in a day N/A float32 -32767 N/A N/A
geolocation_data/height Height meter float32 -32767 N/A N/A
geolocation_data/height_std Height standard deviation meter float32 -32767 N/A N/A
geolocation_data/latitude Latitude degrees_north float32 -32767 N/A N/A
geolocation_data/longitude Longitude degrees_east float32 -32767 N/A N/A
geolocation_data/pixel_id Pixel id N/A int32 -32767 N/A N/A
geolocation_data/relative_azimuth_angle Relative azimuth angle degree float32 -32767 N/A N/A
geolocation_data/scattering_angle Scattering angle degree float32 -32767 N/A N/A
geolocation_data/sensor_zenith_angle Viewing zenith angle degree float32 -32767 N/A N/A
geolocation_data/solar_zenith_angle Solar zenith angle degree float32 -32767 N/A N/A
geolocation_data/utc_date UTC date N/A int32 -32767 N/A N/A
geophysical_data/alh Aerosol layer height km float32 -32767 N/A N/A
geophysical_data/alh_coarse Aerosol layer height (coarse mode) km float32 -32767 N/A N/A
geophysical_data/alh_fine Aerosol layer height (fine mode) km float32 -32767 N/A N/A
geophysical_data/alh_mode1 Aerosol layer height (mode 1) km float32 -32767 N/A N/A
geophysical_data/alh_mode1_uncertainty Uncertainty of aerosol layer height (mode 1) km float32 -32767 N/A N/A
geophysical_data/alh_mode2 Aerosol layer height (mode 2) km float32 -32767 N/A N/A
geophysical_data/alh_mode2_uncertainty Uncertainty of aerosol layer height (mode 2) km float32 -32767 N/A N/A
geophysical_data/alh_mode3 Aerosol layer height (mode 3) km float32 -32767 N/A N/A
geophysical_data/alh_mode3_uncertainty Uncertainty of aerosol layer height (mode 3) km float32 -32767 N/A N/A
geophysical_data/angstrom_440_670 Aerosol Angstrom exponent, 440 to 670 nm N/A float32 -32767 N/A N/A
geophysical_data/angstrom_440_670_uncertainty Uncertainty of aerosol Angstrom exponent, 440 to 670 nm N/A float32 -32767 N/A N/A
geophysical_data/angstrom_440_870 Aerosol Angstrom exponent, 440 to 870 nm N/A float32 -32767 N/A N/A
geophysical_data/angstrom_440_870_uncertainty Uncertainty of aerosol Angstrom exponent, 440 to 870 nm N/A float32 -32767 N/A N/A
geophysical_data/angstrom_490_670 Aerosol Angstrom exponent, 490 to 670 nm N/A float32 -32767 N/A N/A
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