ECOSTRESS Evaporative Stress Index PT-JPL Daily L4 Global 70 m

PI: Simon Hook, Joshua Fisher


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 ECO4ESIPTJPL Version 1 data product provides Evaporative Stress Index (ESI) data generated according to the Priestley-Taylor Jet Propulsion Laboratory (PT-JPL) algorithm described in the ECOSTRESS Level 4 (ESI_PT-JPL) Algorithm Theoretical Basis Document (ATBD). The ESI product is derived from the ratio of the Level 3 actual evapotranspiration (ET) to potential ET (PET) calculated as part of the algorithm. The ESI is an indicator of potential drought and plant water stress emphasizing areas of sub-optimal plant productivity.

The ECO4ESIPTJPL Version 1 data product contains layers of ESI and PET.

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Collection and Granule


Characteristic Description
File Size~235 MB
Temporal ResolutionVaries
Temporal Extent2018-07-15 to Present
Spatial ExtentGlobal (+/- 52 degrees latitude)
Coordinate SystemNone (Swath)
File FormatHDF5
Geographic Dimensions400 km x 400 km


Characteristic Description
Number of Science Dataset (SDS) Layers2
Columns/Rows5400 x 5632
Pixel Size70 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
ESIavg Evaporative Stress Index ET/PET 32-bit floating point N/A N/A 0 to 2 N/A
PET Potential Evapotranspiration W/m² 32-bit floating point N/A N/A 0 to 2000 N/A

Product Quality

No quality flags are produced for the ECO4ESIPTJPL Version 1 data product. Instead, the quality flags of the source data are available in the ECO3ANCQA Version 1 data product.

Known Issues

  • 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.

About the image

ECOSTRESS evaporative stress index data from the ECO4ESIPTJPL product over Central Valley, California, United States, acquired on August 5, 2018.

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User Guide

Algorithm Theoretical Basis Document (ATBD)

Product Specification Document (PSD)

Algorithm Specification Document (ASD)

Earthdata Search Quick Guide

Using the Data

Access Data