ECO1BMAPRAD v001

ECOSTRESS Resampled Radiance 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 ECO1BMAPRAD Version 1 data product combines the at-sensor calibrated radiance values retrieved for the ECO1BRAD data product and the geolocation information provided in the ECO1BGEO data product to produce a geotagged, resampled radiance product. The ECO1BMAPRAD data product is produced as a map registered product that is in a rotated geographic projection with a spatial resolution of 70 meters (m). The ECO1BMAPRAD data product accounts for the overlap and variable pixel size in the ECO1BRAD data product.

The ECO1BMAPRAD Version 1 data product contains data layers including the radiance values for the five thermal infrared (TIR) bands, digital number (DN) values for the shortwave infrared (SWIR) band, associated data quality indicators, latitude and longitude values, solar and view geometry information, and surface height. For acquisitions after May 15, 2019, data products contain data values for the 8.785 μm, 10.522 μm, and 12.001 μm (TIR) bands only. The 1.6 μm (SWIR), 8.285 μm (TIR), and 9.060 μm (TIR) bands contain fill values to accommodate direct streaming of data from the ISS as mentioned in the Known Issues section.

Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionECOSTRESS
DOI10.5067/ECOSTRESS/ECO1BMAPRAD.001
File Size~2-3 GB
Temporal ResolutionVaries
Temporal Extent2018-07-09 to Present
Spatial ExtentCONUS, key biomes/agricultural zones, selected FLUXNET sites
Coordinate SystemGeographic Latitude and Longitude
DatumWorld Geodetic System (WGS84)
File FormatHDF5
Geographic Dimensions400 km x 400 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers18
Columns/RowsVaries by scene x Varies by scene
Pixel Size70 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
data_quality_1 Data Quality Indicators for radiance_1 N/A 8-bit signed integer N/A N/A 0 to 4 N/A
data_quality_2 Data Quality Indicators for radiance_2 N/A 8-bit signed integer N/A N/A 0 to 4 N/A
data_quality_3 Data Quality Indicators for radiance_3 N/A 8-bit signed integer N/A N/A 0 to 4 N/A
data_quality_4 Data Quality Indicators for radiance_4 N/A 8-bit signed integer N/A N/A 0 to 4 N/A
data_quality_5 Data Quality Indicators for radiance_5 N/A 8-bit signed integer N/A N/A 0 to 4 N/A
height Surface Height Meters 32-bit floating point N/A N/A N/A N/A
latitude Latitude Degree 64-bit floating point N/A N/A -90 to 90 N/A
longitude Longitude Degree 64-bit floating point N/A N/A -180 to 180 N/A
radiance_1 TIR 8.285 microns W/m²/sr/μm 32-bit floating point -9999 to -9997 N/A N/A N/A
radiance_2 TIR 8.785 microns W/m²/sr/μm 32-bit floating point -9999 to -9997 N/A N/A N/A
radiance_3 TIR 9.060 microns W/m²/sr/μm 32-bit floating point -9999 to -9997 N/A N/A N/A
radiance_4 TIR 10.522 microns W/m²/sr/μm 32-bit floating point -9999 to -9997 N/A N/A N/A
radiance_5 TIR 12.001 microns W/m²/sr/μm 32-bit floating point -9999 to -9997 N/A N/A N/A
solar_azimuth Solar azimuth angle Degree 32-bit floating point -9997 N/A -180 to 180 N/A
solar_zenith Solar zenith angle Degree 32-bit floating point -9997 N/A -90 to 90 N/A
swir_dn Uncalibrated SWIR data with Dark Current subtracted N/A 16-bit signed integer -9999 to -9997 N/A N/A N/A
view_azimuth View azimuth angle Degree 32-bit floating point -9997 N/A -180 to 180 N/A
view_zenith View zenith angle Degree 32-bit floating point -9997 N/A -90 to 90 N/A

Fill Value Classes

Value Description
-9997 Pixel not seen
-9998 Missing data due to striping (not filled in)
-9999 Missing/bad data

Data Quality Classes

Value Description
0 Good
1 Missing stripe data, filled in
2 Missing stripe data, not filled in
3 Missing/bad data
4 Not seen

Product Quality

Quality information for the ECO1BMAPRAD Version 1 data product is not provided.

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).

  • Resampled data: The data has been resampled, so users interested in working with data closest to that acquired by the instrument may want to work with the swath products.

  • Missing scan data: During testing, an instrument artifact was encountered in ECOSTRESS bands 1 and 5, resulting in missing values. A machine learning algorithm has been applied to interpolate missing values. For more information on the missing scan filling techniques and outcomes, see section 3.3.2 of the User Guide.

  • Cold bias: ECOSTRESS Level-1 Radiance data shows high correlation with in-situ ground measurements (R2 = 0.99 in all bands). Currently, ECOSTRESS has a cold bias of approximately 0.7 Kelvin (K), which will be corrected through calibration in future data releases.

Documentation

Using the Data

E-Learning

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

Tools

Citation

DOI: 10.5067/ECOSTRESS/ECO1BMAPRAD.001

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