ECO_L1B_GEO v002

ECOSTRESS Swath Geolocation Instantaneous L1B Global 70 m

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


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 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 Geolocation Instantaneous Level 1B Global (ECO_L1B_GEO) Version 2 data product provides the geolocation information for the radiance values retrieved in the ECO_L1B_RAD Version 2 data product. The geolocation product gives geo-tagging to each of the radiance pixels. The geolocation processing corrects the ISS-reported ephemeris and attitude data by image matching with a global ortho-base derived from Landsat data, and then assigns latitude and longitude values to each of the Level 1 radiance pixels. When image matching is successful, the data are geolocated to better than 50 meter (m) accuracy. The ECO_L1B_GEO data product is provided as swath data.

The ECO_L1B_GEO data product contains data layers for latitude and longitude values, solar and view geometry information, surface height, and the fraction of pixel on land versus water distributed in HDF5 format.

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Improvements/Changes from Previous Versions

If the initial co-registration is of poor quality or fails, up to four retries are attempted using modified parameters to match the scene. See Section 4.2 of the User Guide.

Collection and Granule


Characteristic Description
File Size~800 MB
Temporal ResolutionVaries
Temporal Extent2018-07-09 to Present
Spatial ExtentGlobal (+/- 52 degrees latitude)
Coordinate SystemN/A
File FormatHDF5
Geographic Dimensions400 km x 400 km


Characteristic Description
Number of Science Dataset (SDS) Layers9
Columns/Rows5400 x 5632
Pixel Size70 m


SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
height Surface Height Meters 32-bit floating point N/A N/A N/A N/A
land_fraction Percentage of pixel that is land Percent 32-bit floating point -9999 N/A 0 to 100 N/A
latitude Latitude Degree 64-bit floating point N/A N/A -90 to 90 N/A
line_start_time_j2000 J2000¹ time of first pixel in line Seconds 64-bit floating point N/A N/A N/A N/A
longitude Longitude Degree 64-bit floating point N/A N/A -180 to 180 N/A
solar_azimuth Solar azimuth angle Degree 32-bit floating point N/A N/A -180 to 180 N/A
solar_zenith Solar zenith angle Degree 32-bit floating point N/A N/A -90 to 90 N/A
view_azimuth View azimuth angle Degree 32-bit floating point N/A N/A -180 to 180 N/A
view_zenith View zenith angle Degree 32-bit floating point N/A N/A -90 to 90 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

  • Geolocation accuracy: In cases where scenes were not successfully matched with the ortho-base, the geolocation error is significantly larger; the worst-case geolocation error for uncorrected data is 7 kilometers (km). Within the metadata of the ECO_L1B_GEO file, if the field "L1GEOMetadata/OrbitCorrectionPerformed" is "True", the data was corrected, and geolocation accuracy should be better than 50 m. If this field is "False", then the data was processed without correcting the geolocation and will have up to 7 km geolocation error.

  • 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 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.


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

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