Overview
DOI | https://doi.org/10.3334/ORNLDAAC/2220 |
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Version | 1 |
Project | |
Published | 2023-07-17 |
Usage | 6 downloads |
Description
Generated by the Space-based Imaging Spectroscopy and Thermal pathfindER (SISTER) activity in support of the NASA Earth System Observatory's Surface Biology and Geology (SBG) mission, this dataset utilizes existing airborne and spaceborne sources to generate prototype data products spanning terrestrial ecosystems, inland and coastal aquatic ecosystems, hydrology, and geology. The objective of SISTER is to mature many of the workflows, algorithms, and data products envisioned for SBG, lay the groundwork to develop a robust cal/val network, and build a vigorous and expansive user community ahead of launch. This dataset contains experimental Level 2A resampled surface reflectances and reflectance uncertainties at 60-m spatial resolution derived from data measured by NASA's Earth Surface Mineral Dust Source Investigation (EMIT) instrument. For the purposes of SISTER, only a handful of scenes have been selected from this mission, with a temporal range between 2022-08-10 and 2023-03-25 and a spatial coverage that is global in scale. EMIT measures reflected radiance at ~7.5 nanometer (nm) intervals in the visible to shortwave infrared spectral range between 381 and 2493 nm. The raw EMIT data are first processed to L1B calibrated radiance by the Imaging Spectroscopy Group at Jet Propulsion Laboratory (JPL) and then ingested into the SISTER platform for further downstream analysis. This collection was derived from corrected surface reflectance using a spectral mixture analysis. Spectral unmixing was performed to derive per-pixel fractional cover estimates of soil, vegetation, water and snow/ice using a generic four endmember dataset. The output products are provided in GeoTIFF format with values expressed as percentages in the range 0-1.
Science Keywords
- LAND SURFACE
- SOILS
- LAND SURFACE
- LAND USE/LAND COVER
- LAND/OCEAN/ICE FRACTION
- CRYOSPHERE
- LAND ICE/OCEAN CLASSIFICATION
- OCEANS
- GEOLOGICAL FEATURES
- LAND/OCEAN/ICE MASK
- BIOSPHERE
- VEGETATION
Data Use and Citation
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Data Files
Companion Files
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Dataset Companion Files
Dataset has 1 companion files.
- SISTER_EMIT_L2B_FRCOV_V2.pdf