Table · dataset · 2025
Near Real-Time MODIS/Terra L3 Global Daily 500m SIN Grid Snow Cover, Snow Albedo, and Snow Surface Properties, Version 1
Listed in NASA Data Portal
This data set contains the following parameters: snow fraction (on the ground), viewable snow fraction, snow cover duration, snow grain size, dust concentration, snow albedo (on horizontal surface), snow albedo (on sloped surface), and radiative forcing.
Description
All variables are spatially and temporally complete after interpolation. Days without observation is also included so that users can determine how many days since a satellite observation occurred.
The data set is derived from a version of the spectral mixture analysis (SMA) approach called the Snow Property Inversion from Remote Sensing (SPIReS, Bair et al, 2021 ). This dataset uses surface reflectance inputs from MOD09GA v6.1 and includes additional outputs not included in the original version of SPIReS: snow albedo and snow radiative forcing. The SPIReS SMA model considers three spectral endmembers: snow, shade, and a snow-free background reflectance, which is identified for each MODIS pixel as the average MOD09GA reflectance measured typically between 1 August and 30 September for a given year in the northern hemisphere. dust concentration is solved for simultaneously with fractional snow cover and snow grain size during the spectral unmixing process.
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SPIReS snow albedo are derived using a lookup table that incorporates snow grain size, dust concentration, and surface illumination ( Bair et al., 2019 ). After the fSCA, grain size, and dust concentration are determined, these properties are filled, smoothed, and adjusted for canopy gap size, shade, and permanent ice. SPIReS radiative forcing are derived using a lookup table that incorporates LAP concentration and clear sky incoming solar irradiance.
Data are available from 01 October 2025 to present. These data are provided in the netCDF-4 format with a Sinusoidal projection and are currently available for the western United States (MODIS tiles h08v04, h08v05, h09v04, h09v05, h10v04). Additional tiles will be added over time.
For data prior to 01 October 2025, please see the historical dataset ( Rittger et al., 2025 ) created by Snow Today at NSIDC.
Note
Authors Rittger, K. and Lenard, S. contributed equally to this work Data can be accessed via ftp://dtn.rc.colorado.edu/shares/snow-today/gridded_data/SPIRES_NRT_V01
Links
Get the data
- Resource dtn.rc.colorado.edu/shares/snow-today/gridded_data/SPIRES_NRT_V01?major_version=1 ↗
download · from data nasa gov
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C3537316791-NSIDCV0.iso19115 ↗
download · from data nasa gov
- Resource nsidc.org/snow-today/snow-viewer ↗
download · from data nasa gov
- Resource doi.org/10.7265/hs6b-zg21 ↗
download · DOI / persistent id · from data nasa gov
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/near-real-time-modis-terra-l3-global-daily-500m-sin-gr… ↗
landing page · from data nasa gov
Catalogue records · 1
- CKAN API data.nasa.gov/api/3/action/package_show?id=0a7c9ce8-3513-4dea-960d-41c66c7b6… ↗
metadata API · from data nasa gov
Topics
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
- Inferred from text
- Physical geography and environmental geoscience 72% · Satellite remote sensing 65% · Tabular 65%
Provenance · 1 source records, 13 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Data Portal | 0a7c9ce8-3513-4dea-960d-41c66c7b6f79 | 9 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].anzsrc:group:3709 | enrichment · data nasa gov | taxonomy-embedding@1.0.0 | title+keywords+description (72%) |
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[modality].local:modality:remote-sensing | enrichment · data nasa gov | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[modality].local:modality:tabular | enrichment · data nasa gov | keyword-concept-rules@1.0.0 | title+description (65%) |
| created_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| description | source · data nasa gov | connector:data_nasa_gov@1.0.0 | /notes |
| license_text | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| publication_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| title | source · data nasa gov | connector:data_nasa_gov@1.0.0 | /title |
| updated_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 |