Overview
DOI | https://doi.org/10.3334/ORNLDAAC/2175 |
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Version | 1 |
Project | |
Published | 2023-05-18 |
Updated | 2023-06-04 |
Usage | 24 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 2B snow grain sizes at 30-m spatial resolution derived from data measured by the Airborne Visible/Infrared Imaging Spectrometer-Next Generation (AVIRIS-NG) instrument during various campaigns (https://avirisng.jpl.nasa.gov/). For the purposes of SISTER, only a handful of scenes have been selected from these campaigns, with a temporal range between 2014-06-25 and 2022-08-19 and spatial coverage within the United States of America and Italy. AVIRIS-NG measures reflected radiance at 5-nanometer (nm) intervals in the visible to shortwave infrared spectral range between 380 and 2510 nm. The raw AVIRIS-NG data is first processed to L1B orthocorrected 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 and fractional cover datasets using the snow grain size estimation method of Nolin and Dozier (2000). Snow grain size was calculated on pixels with greater than 90% snow cover and was modeled as a function of scaled band area centered at the 1030 nm ice absorption feature. The output products are provided in GeoTIFF format with snow grain sizes expressed in microns.
Science Keywords
- CRYOSPHERE
- SNOW/ICE
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Data Files
Companion Files
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Dataset Companion Files
Dataset has 1 companion files.
- SISTER_AVNG_L2B_SNOWGRAIN.pdf