ECO3ETPTJPL v001

ECOSTRESS Evapotranspiration PT-JPL Daily L3 Global 70 m


PI: Simon Hook, Joshua Fisher

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.

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.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionECOSTRESS
DOI10.5067/ECOSTRESS/ECO3ETPTJPL.001
File Size~700 MB
Temporal ResolutionVaries
Temporal Extent2018-07-09 to Present
Spatial ExtentCONUS, key biomes/agricultural zones, selected FLUXNET sites
Coordinate SystemNone (Swath)
DatumN/A
File FormatHDF5
Geographic Dimensions400 km x 400 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers6
Columns/Rows5400 x 5632
Pixel Size70 m

Layers

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

Product Quality

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.

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).

Documentation

Using the Data

E-Learning

NASA ARSET New Sensor Highlight: ECOSTRESS

Access Data

Citation

DOI: 10.5067/ECOSTRESS/ECO3ETPTJPL.001

About the Image

ECOSTRESS instantaneous latent heat flux data from ECO3ETPTJPL product, acquired over Western Kansas, United States, on August 27, 2018.

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