ECOSTRESS instantaneous latent heat flux data from ECO3ETPTJPL product, acquired over Western Kansas, United States, on August 27, 2018.
View full-size imageThe 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.
ECO3ETPTJPL Version 1 is a Level 3 (L3) product that provides evapotranspiration (ET) generated from data acquired by the ECOSTRESS radiometer instrument according to the Priestly-Taylor Jet Propulsion Laboratory (PT-JPL) algorithm described in the Algorithm Theoretical Basis Document (ATBD). The ET product is generated from the Level 2 data products for surface temperature and emissivity, the Level 1 geolocation information, and a significant number of ancillary data inputs from other sources. ET is set by various controls, including radiative and atmospheric demand, and environmental sensitivity, productivity, vegetation physiology, and phenology. PT-JPL is best utilized for natural ecosystems. The L3 ET product is used for creating the Level 4 products, Evaporative Stress Index (ESI) and Water Use Efficiency (WUE).
The ECO3ETPTJPL Version 1 data product contains layers of instantaneous ET, daily ET, canopy transpiration, soil evaporation, ET uncertainty, and interception evaporation.
| Characteristic | Description |
|---|---|
| Collection | ECOSTRESS |
| DOI | 10.5067/ECOSTRESS/ECO3ETPTJPL.001 |
| File Size | ~700 MB |
| Temporal Resolution | Varies |
| Temporal Extent | 2018-07-15 to Present |
| Spatial Extent | Global (+/- 52 degrees latitude) |
| Coordinate System | None (Swath) |
| Datum | N/A |
| File Format | HDF5 |
| Geographic Dimensions | 400 km x 400 km |
| Characteristic | Description |
|---|---|
| Number of Science Dataset (SDS) Layers | 6 |
| Columns/Rows | 5400 x 5632 |
| Pixel Size | 70 m |
| SDS Name | Description | Units | Data Type | Fill Value | No Data Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|---|
| ETinst | Instantaneous Latent Heat Flux | W/m² | 32-bit floating point | N/A | N/A | 0 to 2000 | N/A |
| ETdaily | Daily Latent Heat Flux | W/m² | 32-bit floating point | N/A | N/A | 0 to 2000 | N/A |
| ETcanopy | Canopy Evaporation | Percent | 32-bit floating point | N/A | N/A | 0 to 100 | N/A |
| ETsoil | Soil Evaporation | Percent | 32-bit floating point | N/A | N/A | 0 to 100 | N/A |
| ETinterception | Interception Evaporation | Percent | 32-bit floating point | N/A | N/A | 0 to 100 | N/A |
| ETinstUncertainty | ETinst Uncertainty | W/m² | 32-bit floating point | N/A | N/A | 0 to 2000 | N/A |
No quality flags are produced for ECO3ETPTJPL Version 1 data product. Instead, the quality flags of the source data are available in the ECO3ANCQA Version 1 data product.
Data acquisition gaps: 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. To optimize the new acquisition approach TIR bands 2, 4 and 5 are being downloaded. The data products are as previously, except the bands not downloaded contain fill values (L1 radiance and L2 emissivity). This approach was implemented from May 15, 2019, through April 28, 2023.
Data acquisition gap: From February 8 to February 16, 2020, an ECOSTRESS instrument issue resulted in a data anomaly that created striping in band 4 (10.5 micron). These data products have been reprocessed and are available for download. No ECOSTRESS data were acquired on February 17, 2020, due to the instrument being in SAFEHOLD. Data acquired following the anomaly have not been affected.
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.