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Description

This Level-1C (L1C) product contains calibrated, geolocated, time-ordered brightness temperatures acquired by the Soil Moisture Active Passive (SMAP) radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. SMAP L-band Level-1B brightness temperature data were resampled to an Earth-fixed, 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in three projections: global cylindrical, north polar, and south polar. This L1C product is a gridded version of the SMAP Level-1B radiometer brightness temperature product.

Version Description

Changes to this version include:
  • Uses updated SPL1BTB V3 Validated data as input
  • Updated processing to produce SPL1CTB data files when partial half-orbit input files are present

Product Summary

Platforms
SMAP Observatory
Instruments
SMAP L-BAND RADIOMETER
Spatial Extent

N: 85.044 S: -85.044 E: 180 W: -180

Spatial Resolution
36 Kilometers x 36 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
C2812934949-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
1C
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

Chan, S., Njoku, E., & Colliander, A. (2016). SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 3 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/E51BSP6V3KP7 Date Accessed: 2026-06-15

Documents

Publications Citing This Dataset

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Title Year Author Topic
The benefit of brightness temperature assimilation for the SMAP Level-4 surface and root-zone soil moisture analysis Qiu, Jianxiu, Dong, Jianzhi, Crow, Wade T., Zhang, Xiaohu, Reichle, Rolf H., De Lannoy, Gabrielle J. M. Brightness Temperature, Surface Soil Moisture, Terrain Elevation
Simultaneous retrieval of surface roughness parameters for bare soils from combined activepassive microwave SMAP observations Fluhrer, Anke, Jagdhuber, Thomas, Akbar, Ruzbeh, O'Neill, Peggy E., Entekhabi, Dara Carbon, Cation Exchange Capacity, Organic Matter, ORBITAL CHARACTERISTICS, RADAR IMAGERY, SIGMA NAUGHT, Brightness Temperature, Soil Moisture/Water Content, Transition Direction
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
Simultaneous retrieval of surface roughness parameters from combined active-passive SMAP observations Fluhrer, Anke, Jagdhuber, Thomas, Akbar, Ruzbeh, O'Neill, Peggy, Entekhabi, Dara ORBITAL CHARACTERISTICS, RADAR IMAGERY, SIGMA NAUGHT, Brightness Temperature, Soil Moisture/Water Content, Transition Direction
A First-Order Radiative Transfer Model for Global Soil Moisture Retrievals Under Vegetation Canopies Feldman, Andrew, Akbar, Ruzbeh, Entekhabi, Dara Brightness Temperature
An assessment of the differences between spatial resolution and grid size for the SMAP enhanced soil moisture product over homogeneous sites Colliander, A., Jackson, T.J., Chan, S.K., O'Neill, P., Bindlish, R., Cosh, M.H., Caldwell, T., Walker, J.P., Berg, A., McNairn, H., Thibeault, M., Martinez-Fernandez, J., Jensen, K.H., Asanuma, J., Seyfried, M.S., Bosch, D.D., Starks, P.J., Holifield Collins, C., Prueger, J.H., Su, Z., Lopez-Baeza, E., Yueh, S.H. Brightness Temperature, Soil Moisture/Water Content
Characterization of higher-order scattering from vegetation with SMAP measurements Feldman, Andrew F., Akbar, Ruzbeh, Entekhabi, Dara Soil Moisture/Water Content, Soil Temperature, Brightness Temperature
Improved hydrological simulation using SMAP data: Relative impacts of model calibration and data assimilation Koster, Randal D., Liu, Qing, Mahanama, Sarith P. P., Reichle, Rolf H. Brightness Temperature, Soil Moisture/Water Content
Estimating surface soil moisture from SMAP observations using a Neural Network technique Kolassa, J., Reichle, R.H., Liu, Q., Alemohammad, S.H., Gentine, P., Aida, K., Asanuma, J., Bircher, S., Caldwell, T., Colliander, A., Cosh, M., Holifield Collins, C., Jackson, T.J., Martinez-Fernandez, J., McNairn, H., Pacheco, A., Thibeault, M., Walker, J.P. Soil Temperature, Soil Moisture/Water Content, 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
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
Assessment of the SMAP level-4 surface and root-zone soil moisture product using in situ measurements Reichle, Rolf H., De Lannoy, Gabrielle J. M., Liu, Qing, Ardizzone, Joseph V., Colliander, Andreas, Conaty, Austin, Crow, Wade, Jackson, Thomas J., Jones, Lucas A., Kimball, John S., Koster, Randal D., Mahanama, Sarith P., Smith, Edmond B., Berg, Aaron, Bircher, Simone, Bosch, David, Caldwell, Todd G., Cosh, Michael, Gonzalez-Zamora, Angel, Holifield Collins, Chandra D., Jensen, Karsten H., Livingston, Stan, Lopez-Baeza, Ernesto, Martinez-Fernandez, Jose, McNairn, Heather, Moghaddam, Mahta, Pacheco, Anna, Pellarin, Thierry, Prueger, John, Rowlandson, Tracy, Seyfried, Mark, Starks, Patrick, Su, Zhongbo, Thibeault, Marc, van der Velde, Rogier, Walker, Jeffrey, Wu, Xiaoling, Zeng, Yijian Brightness Temperature, Soil Classification, Soil Depth, Soil Porosity, Soil Texture, Terrain Elevation, Root Zone Soil Moisture, Surface Soil Moisture
Joint Sentinel-1 and SMAP data assimilation to improve soil moisture Lievens, H., Reichle, R. H., Liu, Q., De Lannoy, G. J. M., Dunbar, R. S., Kim, S. B., Das, N. N., Cosh, M., Walker, J. P., Wagner, W. Brightness Temperature
Global assessment of the SMAP Level-4 surface and root-zone soil moisture product using assimilation diagnostics Reichle, Rolf H., De Lannoy, Gabrielle J. M., Liu, Qing, Koster, Randal D., Kimball, John S., Crow, Wade T., Ardizzone, Joseph V., Chakraborty, Purnendu, Collins, Douglas W., Conaty, Austin L., Girotto, Manuela, Jones, Lucas A., Kolassa, Jana, Lievens, Hans, Lucchesi, Robert A., Smith, Edmond B. Brightness Temperature, Soil Classification, Soil Depth, Soil Porosity, Soil Texture, Terrain Elevation, Root Zone Soil Moisture, Surface Soil Moisture
Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements Derksen, Chris, Xu, Xiaolan, Scott Dunbar, R., Colliander, Andreas, Kim, Youngwook, Kimball, John S., Black, T. Andrew, Euskirchen, Eugenie, Langlois, Alexandre, Loranty, Michael M., Marsh, Philip, Rautiainen, Kimmo, Roy, Alexandre, Royer, Alain, Stephens, Jilmarie Freeze/Thaw, SIGMA NAUGHT, Transition Direction, Soil Moisture/Water Content, ORBITAL CHARACTERISTICS, RADAR IMAGERY, Brightness Temperature, Root Zone Soil Moisture, Surface Soil Moisture, Freeze/Thaw
Validation of the Soil Moisture Active Passive (SMAP) satellite soil moisture retrieval in an Arctic tundra environment Wrona, Elizabeth, Rowlandson, Tracy L., Nambiar, Manoj, Berg, Aaron A., Colliander, Andreas, Marsh, Philip Brightness Temperature, Soil Moisture/Water Content
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