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Description

This enhanced Level-1C (L1C) product contains calibrated, geolocated, 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. This product is derived from SMAP Level-1B (L1B) interpolated antenna temperatures. Backus-Gilbert optimal interpolation techniques are used to extract maximum information from SMAP antenna temperatures and convert them to brightness temperatures, which are posted to a 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in three projections: global cylindrical, Northern Hemisphere azimuthal, and Southern Hemisphere azimuthal.

Version Description

First public data release

Product Summary

Platforms
SMAP Observatory
Instruments
SMAP L-BAND RADIOMETER
Spatial Extent

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

Spatial Resolution
9 Kilometers x 9 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
C2830467781-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

Chaubell, J., Chan, S., Dunbar, R., Peng, J., & Yueh, S. (2016). SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 1 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/2C9O9KT6JAWS Date Accessed: 2026-06-17

Documents

Publications Citing This Dataset

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Title Year Author Topic
Assessment of Surface Fractional Water Impacts on SMAP Soil Moisture Retrieval Du, Jinyang, Kimball, John S., Chan, Steven K., Chaubell, Mario Julian, Bindlish, Rajat, Dunbar, R. Scott, Colliander, Andreas Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content
Observed landscape responsiveness to climate forcing Feldman, Andrew F., Short Gianotti, Daniel J., Trigo, Isabel F., Salvucci, Guido D., Entekhabi, Dara Brightness Temperature
Error propagation in microwave soil moisture and vegetation optical depth retrievals Feldman, Andrew, Chaparro, David, Entekhabi, Dara 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
Satellite-Based Assessment of Land Surface Energy Partitioning-Soil Feldman, Andrew F., Short Gianotti, Daniel J., Trigo, Isabel F., Salvucci, Guido D., Entekhabi, Dara Surface Temperature, Skin Temperature, Upper Air Temperature, Air Temperature, Atmospheric Winds, Surface Winds, U/V Wind Components, Atmospheric Pressure, Sea Level Pressure, Surface Pressure, Specific Humidity, Total Precipitable Water, Cloud Liquid Water/Ice, Atmospheric Water Vapor, Atmospheric Ozone, Oxygen Compounds, Altitude, Boundary Layer Winds, 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
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
Moisture pulse-reserve in the soil-plant continuum observed across biomes Feldman, Andrew F., Short Gianotti, Daniel J., Konings, Alexandra G., McColl, Kaighin A., Akbar, Ruzbeh, Salvucci, Guido D., Entekhabi, Dara Canopy Characteristics, Evergreen Vegetation, Crown, Deciduous Vegetation, Leaf Characteristics, Vegetation Cover, Land Use/Land Cover Classification, Brightness Temperature, Soil Moisture/Water Content
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
Blended SMOS-SMAP SSS product in marginal seas Martinez, Justino, Olmedo, Estrella, Gonzalez-Gambau, Veronica, Turiel, Antonio, Yueh, Simon Brightness Temperature
L-band vegetation optical depth and effective scattering albedo estimation from SMAP Konings, Alexandra G., Piles, Maria, Das, Narendra, Entekhabi, Dara Brightness Temperature, Soil Moisture/Water Content
Smap-based retrieval of vegetation opacity and albedo Entekhabi, Dara, Konings, Alexandra, Piles, Maria, Das, Narendra Brightness Temperature
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