SISTER: EMIT L2A Resampled Surface Reflectance and Uncertainty 60 m V002

Overview

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 native spectral resolution surface reflectances and reflectance uncertainties using a spectral resampling algorithm. Spectral resampling was performed in a two-step process. First, bands were aggregated and averaged to the closest resolution to the target resolution (10 nm). Next, a piecewise cubic interpolator was used to interpolate the spectra to the target wavelength spacing. The output products are provided in ENVI format with values expressed as percentages in the range 0-1.

Science Keywords

Data Use and Citation

Data Files