ECO1BGEO v001

ECOSTRESS Geolocation Daily L1B Global 70 m


PI: Simon Hook

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.

The ECO1BGEO Version 1 data product provides the geolocation information for the radiance values retrieved in the ECO1BRAD Version 1 data product. The ECO1BGEO data product should be used to georeference the ECO1BRAD, ECO2CLD, ECO2LSTE, ECO3ANCQA, ECO3ETPTJPL, ECO4ESIPTJPL, and ECO4WUE data products. 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 ECO1BGEO data product is provided as swath data.

The ECO1BGEO 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.

Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionECOSTRESS
DOI10.5067/ECOSTRESS/ECO1BGEO.001
File Size~1.2 GB
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) Layers9
Columns/Rows5400 x 5632
Pixel Size70 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
height Surface Height Meters 32-bit floating point N/A 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 N/A
latitude Latitude Degree 64-bit floating point N/A N/A -90 to 90 N/A N/A
line_start_time_j2000 J2000 time of first pixel in line Seconds 64-bit floating point N/A N/A N/A N/A N/A
longitude Longitude Degree 64-bit floating point N/A N/A -180 to 180 N/A N/A
solar_azimuth Solar azimuth angle Degree 32-bit floating point N/A N/A -180 to 180 N/A N/A
solar_zenith Solar zenith angle Degree 32-bit floating point N/A N/A -90 to 90 N/A N/A
view_azimuth View azimuth angle Degree 32-bit floating point N/A N/A -180 to 180 N/A N/A
view_zenith View zenith angle Degree 32-bit floating point N/A N/A -90 to 90 N/A N/A

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, with the worst-case geolocation error for uncorrected data being at 7 kilometer (km). Within the metadata of the ECO1BGEO file, if the field "L1GEOMetadata/OrbitCorrectionPerformed" is "True," the data was corrected, and geolocation accuracy should be better than 50 m. If this is "False," then the data was processed without correcting the geolocation and will have up to 7 km geolocation error.

  • Data acquisition gaps: ECOSTRESS was launched on June 29th, 2018, and moved to autonomous science operations on August 20th, 2018, following a successful in-orbit checkout period. On September 29th, ECOSTRESS experienced an anomaly with its primary mass storage unit (MSU). ECOSTRESS has a primary and secondary MSU (A and B). On December 5th, the instrument was switched to the secondary MSU and operations resumed with initial acquisitions over Australia and wider coverage resumed on January 9th, 2019. The initial anomaly was attributed to exposure to high radiation regions, primarily over the Southern Atlantic Anomaly, and the acquisition strategy was revised to exclude these regions from future acquisitions. On March 14th, 2019, the secondary MSU experienced an anomaly and acquisitions are temporarily on hold. Work is underway to implement a direct streaming option, which will bypass the need for mass storage units.

Documentation

Using the Data

E-Learning

Hands-on Workshop for Accessing, Processing, and Analyzing ECOSTRESS Data

ECOSTRESS: NASA's Next-Generation Mission to Measure Evapotranspiration from the ISS

Tools

Citation

DOI: 10.5067/ECOSTRESS/ECO1BGEO.001

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