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.
|File Size||~1.2 GB|
|Temporal Extent||2018-07-09 to Present|
|Spatial Extent||CONUS, key biomes/agricultural zones, selected FLUXNET sites|
|Coordinate System||None (Swath)|
|Geographic Dimensions||400 km x 400 km|
|Number of Science Dataset (SDS) Layers||9|
|Columns/Rows||5400 x 5632|
|Pixel Size||70 m|
|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|
Quality information is provided in section 4 of the User Guide.
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.