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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.

Version Description

Initial dataset

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
2024-02-23 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
C3294162788-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
8250
Processing Level
1
Published
Updated
Science Keywords
Ocean Color ,
Aerosol Particle Properties

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

NASA Ocean Biology Processing Group. (2025). PACE SPEXone Level-1A Science Data, version 3 [Data set]. NASA Ocean Biology Distributed Active Archive Center. https://doi.org/10.5067/PACE/SPEXONE/L1A/SCI/3 Date Accessed: 2025-12-14

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
engineering_data/HK_tlm_time HK telemetry packet time seconds since 2025-01-09 00:00:00 float64 -32767 0 to 92304 N/A
engineering_data/NomHK_telemetry SPEXone nominal-HK telemetry N/A OTHER N/A N/A N/A
engineering_data/temp_detector Detector temperature degC float32 N/A 17.829999923706 to 18.829999923706 N/A
engineering_data/temp_housing Housing temperature degC float32 N/A 19.110000610352 to 20.110000610352 N/A
engineering_data/temp_radiator Radiator temperature degC float32 N/A -2 to 3 N/A
image_attributes/binning_table Binning-table ID N/A uint8 N/A 0 to 255 N/A
image_attributes/digital_offset Digital offset 1 int16 N/A N/A N/A
image_attributes/exposure_time Exposure time s float64 0 N/A N/A
image_attributes/icu_time_sec ICU time stamp (seconds) seconds since 1958-01-01 00:00:00 TAI uint32 N/A 1956528000 to 2493072000 N/A
image_attributes/icu_time_subsec ICU time stamp (sub-seconds) 1/65536 s uint16 N/A 0 to 65535 N/A
image_attributes/image_ID Image counter from power-up N/A int32 N/A 0 to 2147483647 N/A
image_attributes/image_time Image time seconds since 2025-01-09 00:00:00 float64 -32767 0 to 92304 N/A
image_attributes/nr_coadditions Number of coadditions 1 uint16 0 1 N/A
image_attributes/timedelta_centre Time-delta to centre of integration time s float64 -32767 N/A N/A
navigation_data/att_quat Attitude quaternions (J2000 to spacecraft) seconds float32 -32767 -1 to 1 N/A
navigation_data/att_rate Attitude angular rates in spacecraft frame radians/second float32 -32767 -0.0040000001899898 to 0.0040000001899898 N/A
navigation_data/att_time Attitude sample time (seconds of day) seconds since 2025-01-09 float64 -32767 0 to 172800 N/A
navigation_data/coverage_quality Coverage quality of navigation data N/A int64 N/A N/A N/A
navigation_data/orb_alt Orbit altitude meters float64 -32767 670000 to 710000 N/A
navigation_data/orb_lat Orbit latitude (degrees North) degrees_north float64 -32767 -90 to 90 N/A
navigation_data/orb_lon Orbit longitude (degrees East) degrees_east float64 -32767 -180 to 180 N/A
navigation_data/orb_pos Orbit position vectors (ECR) meters float32 -9999999 -7200000 to 7200000 N/A
navigation_data/orb_time Orbit vector time (seconds of day) seconds since 2025-01-09 float64 -32767 0 to 172800 N/A
navigation_data/orb_vel Orbit velocity vectors (ECR) meters/second float32 -32767 -7600 to 7600 N/A
navigation_data/tilt Tilt angle degrees float32 -32767 -20.10000038147 to 20.10000038147 N/A
navigation_data/tilt_flag Tilt quality flag N/A uint8 255 N/A N/A
navigation_data/tilt_time Tilt sample time (seconds of day) seconds since 2025-01-09 float64 -32767 0 to 172800 N/A
processor_configuration processor_configuration N/A OTHER N/A N/A N/A
science_data/detector_images Detector pixel values counts uint16 65535 0 to 65534 N/A
science_data/detector_telemetry SPEXone science telemetry N/A OTHER N/A N/A N/A
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