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 globally between 52° N and 52° S latitudes. A map of the acquisition coverage can be found in figure 2 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.
| Characteristic | Description |
|---|---|
| Collection | ECOSTRESS |
| DOI | 10.5067/ECOSTRESS/ECO_L1B_ATT.002 |
| File Size | ~800 KB |
| Temporal Resolution | Varies |
| Temporal Extent | 2018-07-09 to Present |
| Spatial Extent | Global (+/- 52 degrees latitude) |
| Coordinate System | N/A |
| Datum | N/A |
| File Format | HDF5 |
| Geographic Dimensions | 400 km x 400 km |
| Characteristic | Description |
|---|---|
| Number of Science Dataset (SDS) Layers | 10 |
| Columns/Rows | 5400 x 5632 |
| Pixel Size | N/A |
| 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.
Quality information is provided in Section 4 of the User Guide.
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.
Data acquisition: ECOSTRESS has now successfully returned to 5-band mode after being in 3-band mode since 2019. This feature was successfully enabled following a Data Processing Unit firmware update (version 4.1) to the payload on April 28, 2023. To better balance contiguous science data scene variables, 3-band collection is currently being interleaved with 5-band acquisitions over the orbital day/night periods.