Near Real-time SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures V105

This Near Real-Time (NRT) data set corresponds to the standard SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures (SPL1BTB) product. The data provide calibrated estimates of time-ordered geolocated brightness temperature data measured by the Soil Moisture Active Passive (SMAP) passive microwave radiometer, the SMAP L-band radiometer. These Near Real-Time data are available within three hours of satellite observation. The data are created using the latest available ancillary data and spacecraft and antenna attitude data to reduce latency. The SMAP satellite orbits Earth every two to three days, providing half-orbit, ascending and descending, coverage from 86.4°S to 86.4°N in swaths 1000 km across. Data are stored for approximately two to three weeks. Thus, at any given time, users have access to at least fourteen consecutive days of Near Real-Time data through the NSIDC DAAC. Users deciding between the NRT and standard SMAP products should consider the immediacy of their needs versus the quality of the data required. Near real-time data are provided for operational needs whereas standard products meet the quality needs of scientific research. If latency is not a primary concern, users are encouraged to use the standard science product, SPL1BTB (https://doi.org/10.5067/ZHHBN1KQLI20).

Data and Resources

Additional Info

Field Value
Maintainer NSIDC Services
Last Updated July 17, 2025, 16:03 (UTC)
Created March 31, 2025, 20:17 (UTC)
accessLevel public
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citation Near Real-time SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures V105. Version 105. Archived by National Aeronautics and Space Administration, U.S. Government, NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/UH70WUPQKCFR.
graphic-preview-description This application allows you to interactively browse global satellite imagery within hours of it being acquired. You can also save it, share it, and download the underlying data.
graphic-preview-file https://worldview.earthdata.nasa.gov/?v=-188,-85,183,86&l=SMAP_L1_Passive_Faraday_Rotation_Fore,SMAP_L1_Passive_Faraday_Rotation_Aft,Coastlines_15m,MODIS_Terra_CorrectedReflectance_TrueColor
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harvest_source_title DNG Legacy Data
identifier C2257958430-NSIDC_ECS
issued 2025-03-06
landingPage https://doi.org/10.5067/UH70WUPQKCFR
language {en-US}
metadata_type geospatial
modified 2025-03-23
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publisher NASA NSIDC DAAC
resource-type Dataset
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spatial -180.0 -86.4 180.0 86.4
temporal 2025-03-06T00:00:00Z/2025-03-24T00:00:00Z
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