ECO_L1B_ATT v002

ECOSTRESS Swath Attitude and Ephemeris Instantaneous L1B Global


PI: Simon Hook, Mike Smyth, Tom Logan, William Johnson

Description

The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) mission measures the temperature of plants to better understand how much water plants need and how they respond to stress. ECOSTRESS is attached to the International Space Station (ISS) and collects data over the conterminous United States (CONUS) as well as key biomes and agricultural zones around the world and selected FLUXNET validation sites. A map of the acquisition coverage can be found on the ECOSTRESS website.

The ECOSTRESS Swath Attitude and Ephemeris Instantaneous Level 1B Global (ECO_L1B_ATT) Version 2 data product provides both corrected and uncorrected attitude quaternions and spacecraft ephemeris data obtained from the ISS. The data are provided in 1 second intervals, and each product file contains vectors from the duration of the orbit.

The ECO_L1B_ATT Version 2 data product contains layers of attitude and ephemeris data generated by the ISS, which are used to start the geolocation process. These layers also include Earth-centered inertial (ECI) position and velocity, and associated time elements distributed in HDF5 format.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionECOSTRESS
DOI10.5067/ECOSTRESS/ECO_L1B_ATT.002
File Size~800 KB
Temporal ResolutionVaries
Temporal Extent2018-07-09 to Present
Spatial ExtentCONUS, key biomes/agricultural zones, selected FLUXNET sites
Coordinate SystemN/A
DatumN/A
File FormatHDF5
Geographic Dimensions400 km x 400 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers10
Columns/Rows5400 x 5632
Pixel SizeN/A

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Attitude quaternion Corrected attitude quaternion goes from spacecraft to ECI (J2000¹ Inertial Frame). The coefficient convention used has the real part in the first column. N/A 64-bit floating point N/A N/A N/A N/A
Attitude time_j2000 Time elements for corrected attitude quaternion Seconds 64-bit floating point N/A N/A N/A N/A
Ephemeris eci_position Corrected Ephemeris ECI position (J2000¹ Inertial Frame) Meters 64-bit floating point N/A N/A N/A N/A
Ephemeris eci_velocity Corrected Ephemeris ECI velocity (J2000¹ Inertial Frame) m/s 64-bit floating point N/A N/A N/A N/A
Ephemeris time_j2000 Time elements for corrected ephemeris data Seconds 64-bit floating point N/A N/A N/A N/A
Uncorrected Attitude quaternion Uncorrected attitude quaternion goes from spacecrasft to ECI (J2000¹ Inertial Frame). The coefficient convention used has the real part in the first column. This is the reported attitude from the ISS, without correction N/A 64-bit floating point N/A N/A N/A N/A
Uncorrected Attitude time_j2000 Time elements for uncorrected attitude quaternion Seconds 64-bit floating point N/A N/A N/A N/A
Uncorrected Ephemeris eci_position Uncorrected Ephemeris ECI position (J2000¹ Inertial Frame) Meters 64-bit floating point N/A N/A N/A N/A
Uncorrected Ephemeris eci_velocity Uncorrected Ephemeris ECI velocity (J2000¹ Inertial Frame) m/s 64-bit floating point N/A N/A N/A N/A
Uncorrected Ephemeris time_j2000 Time elements for uncorrected ephemeris data Seconds 64-bit floating point N/A N/A N/A N/A

¹See the Product Specification Document (PSD) Section 2.4.1 for more information on J2000.

Product Quality

Quality information is provided in Section 4 of the User Guide.

Known Issues

  • Cannot perform spatial query on ECO_L1B_ATT in NASA Earthdata Search: ECO_L1B_ATT does not contain spatial attributes, so granules cannot be searched by geographic location. Users should search for ECO_L1B_ATT data products by orbit number instead.

  • Data acquisition gap: ECOSTRESS was launched on June 29, 2018, and moved to autonomous science operations on August 20, 2018, following a successful in-orbit checkout period. On September 29, 2018, ECOSTRESS experienced an anomaly with its primary mass storage unit (MSU). ECOSTRESS has a primary and secondary MSU (A and B). On December 5, 2018, the instrument was switched to the secondary MSU and science operations resumed. On March 14, 2019, the secondary MSU experienced a similar anomaly, temporarily halting science acquisitions. On May 15, 2019, a new data acquisition approach was implemented, and science acquisitions resumed.


Documentation

User Guide
Calibration Algorithm Theoretical Basis Document (ATBD)
Geolocation Algorithm Theoretical Basis Document (ATBD)
Product Specification Document (PSD)
Radiance Algorithm Specification Document (ASD)
Geolocation Algorithm Specification Document (ASD)
Earthdata Search Quick Guide

Using the Data

Access Data

Citation

DOI: 10.5067/ECOSTRESS/ECO_L1B_ATT.002