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Description

This Level-1B (L1B) product provides calibrated estimates of time-ordered geolocated brightness temperatures measured by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band brightness temperatures are referenced to the Earth's surface with undesired and erroneous radiometric sources removed.

Version Description

Changes to this version include:
  • Updated reflector thermal model
  • Reflector emissivity value back to baseline
  • All calibration coefficients updated back to 3/31/15
  • Direct Galaxy quality flag changed: set when s/c nadir is greater than 5 degrees
  • Reflected Sun quality flag changed: set when specular solar theta is less than 15 degrees
  • Sea ice fraction computation implemented

Product Summary

Platforms
SMAP Observatory
Instruments
SMAP L-BAND RADIOMETER
Spatial Extent

N: 86.4 S: -86.4 E: 180 W: -180

Spatial Resolution
36 Kilometers x 47 Kilometers
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-03-31 to 2018-06-04
Temporal Resolution
49 Minute
Concept ID
C2812934661-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
1B
Published
Updated
Science Keywords
Brightness Temperature

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Piepmeier, J., Mohammed, P., Peng, J., Kim, E., De Amici, G., & Ruf, C. (2016). SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 3 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/YV5VOWY5V446 Date Accessed: 2026-08-05

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
RFI-Net: Enhancing Passive Sensing through Deep Learning Based Time-Frequency Domain Radio Frequency Interference Detection and Mitigation Alam, Ahmed Manavi, Kurum, Mehmet, Gurbuz, Ali C. Brightness Temperature
One-Point Calibration for Soil Moisture Active/Passive (SMAP) L-Band Microwave Radiometer Peng, Jinzheng, Piepmeier, Jeffrey R., Misra, Sidharth, Mohammed, Priscilla, Bringer, Alexandra Brightness Temperature
Triple Collocation Analysis for Two Error-Correlated Datasets: Gonzalez-Gambau, Veronica, Turiel, Antonio, Gonzalez-Haro, Cristina, Martinez, Justino, Olmedo, Estrella, Oliva, Roger, Martin-Neira, Manuel Brightness Temperature
Improving brightness temperature measurements near coastal areas for SMAP Chaubell, Julian, Yueh, Simon H., Peng, Jinzheng, Dunbar, R. Scott, Chan, Steven K., Chen, Fan, Piepmeier, Jeffrey R., Bindlish, Rajat, Entekhabi, Dara, O'Neill, Peggy E. Brightness Temperature
Smap Microwave Radiometer: Instrument Status and Calibration for the First Three Years of Operation Piepmeier, Jeffrey R., Peng, Jinzheng, Misra, Sidharth, Dinnat, Emmanuel P., Yueh, Simon H., Meissner, Thomas, Vine, David M. Le, Shelton, Kacie E., Freedman, Adam P., Dunbar, R. Scott, Chan, Steven K., Chaubell, Julian, Bindlish, Rajat, De Amici, Giovanni, Mohammed, Priscilla N., Hong, Liang Brightness Temperature
The Salinity Retrieval Algorithms for the NASA Aquarius Version 5 and Meissner, Thomas, Wentz, Frank J., Le Vine, David M. Brightness Temperature
Backus-Gilbert optimal interpoaltion applied to enhance smap data: Implementation and assessment Chaubell, J., Chan, S., Dunbar, R., Entekhabi, D., Peng, J., Piepmeier, J., Yueh, S. Brightness Temperature
Capability of the SMAP mission to measure ocean surface winds in storms Meissner, Thomas, Ricciardulli, Lucrezia, Wentz, Frank J. Brightness Temperature
SMAP L-band microwave radiometer: Instrument design and first year on orbit Piepmeier, Jeffrey R., Focardi, Paolo, Horgan, Kevin A., Knuble, Joseph, Ehsan, Negar, Lucey, Jared, Brambora, Clifford, Brown, Paula R., Hoffman, Pamela J., French, Richard T., Mikhaylov, Rebecca L., Kwack, Eug-Yun, Slimko, Eric M., Dawson, Douglas E., Hudson, Derek, Peng, Jinzheng, Mohammed, Priscilla N., De Amici, Giovanni, Freedman, Adam P., Medeiros, James, Sacks, Fred, Estep, Robert, Spencer, Michael W., Chen, Curtis W., Wheeler, Kevin B., Edelstein, Wendy N., O'Neill, Peggy E., Njoku, Eni G. Brightness Temperature
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