Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991
Synthetic aperture radar SMAP in space
    Image credit: NASA/JPL

News: NASA Soil Moisture Radar Ends Operations; Mission Science Continues
News: NASA Focused on Sentinel as Replacement for SMAP Radar 
June 7, 2016: Files Removed from the SMAP L1B and L1C RADAR Datasets


Instrument events timetable

SMAP baseline science-data products Levels 1-4 will be available at the Alaska Satellite Facility (ASF) and the National Snow and Ice Data Center (NSIDC) Distributed Active Archive Centers (DAACs) as indicated in the table below.

SMAP Data Products
(Beta Level 1 radar products now available for download)
Short NameDescriptionGridding (km)Latency*ATBD**Product 
Spec Doc
L1A_RadarRaw radar data in time order (half orbit)-12 hrsn/aView ASF
L1A_RadiometerRadiometer raw data in time order-12 hrsn/aNSIDC
L1B_S0_LoResLow-resolution radar σ ο in time order (half orbit)
5x3012 hrsViewPDF iconViewASF
L1B_TBRadiometer T B in time order36x4712 hrsViewNSIDC
L1C_S0_HiResHigh-resolution radar σ ο (half orbit gridded)
12 hrsViewPDF iconViewASF
L1C_TBRadiometer T B (half orbit, gridded)3612 hrsViewNSIDC
L2_SM_ASoil moisture (radar, half orbit)324 hrsViewNSIDC
L2_SM_PSoil moisture (radiometer, half orbit)3624 hrsViewNSIDC
L2_SM_A/PSoil moisture (radar/radiometer, half orbit)924 hrsViewNSIDC


Freeze-thaw state (radar, daily composite)350 hrsViewNSIDC
L3_SM_ASoil moisture (radar, daily composite)350 hrsViewNSIDC
L3_SM_PSoil moisture (radiometer, daily composite)3650 hrsViewNSIDC
L3_SM_A/PSoil moisture (radar/radiometer, daily composite)950 hrsViewNSIDC
L4_SMSoil moisture (surface and root zone)97 daysViewNSIDC
L4_CCarbon net ecosystem exchange (NEE)914 daysViewNSIDC

*Mean latency under normal operating conditions (defined as time from data acquisition by the observatory to availability to the public data archive).

**Algorithm Theoretical Basis Documents (ATBDs) provide the physical and mathematical descriptions of the algorithms used in the generation of science-data products. The ATBDs include a description of variance and uncertainty estimates and considerations of calibration and validation, exception control, and diagnostics. Internal and external data flows are also described.

***Over outer 70% of swath

Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.