Data Announcements

Replacement Files Available for SMAP Data Impacted by Antenna Azimuth Issue

16 February 2017

Due to a problem with the Antenna Azimuth file used to process the half-orbit 01966_A, the SMAP Science Data System (SDS) team has replaced the following files:

SMAP_L1B_TB_01966_A_20150614T231537_R14010_001.h5 (Regenerated 2017-02-11)
SMAP_L1C_TB_01966_A_20150614T231537_R14010_001.h5 (Regenerated 2017-02-14)
SMAP_L1C_TB_E_01966_A_20150614T231537_R14010_001.h5 (Regenerated 2017-02-14)
SMAP_L2_SM_P_E_01966_A_20150614T231537_R14010_001.h5 (Regenerated 2017-02-14)
SMAP_L2_SM_P_01966_A_20150614T231537_R14010_001.h5 (Regenerated 2017-02-16)

The SMAP SDS has corrected the Antenna Azimuth file and regenerated these half-orbits. Users are advised to download the replacement data files at their earliest convenience.

Select Data Files Impacted by SMAP L1B Processing Algorithm Error

15 February 2017

Due to a problem involving the atmospheric correction algorithm used to process SMAP Level-1B (L1B) brightness temperatures, select half-orbit data files contain invalid brightness temperature values. The errors occur infrequently, about one half orbit per month, and affected files have been removed from the following data sets:

SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures (SPL1BTB), Version 3
Data Set DOI: http://dx.doi.org/10.5067/YV5VOWY5V446

SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures (SPL1CTB), Version 3
Data Set DOI: http://dx.doi.org/10.5067/Y9C3Q3060AZ5

SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture (SPL2SMP), Version 4
Data Set DOI: http://dx.doi.org/10.5067/XPJTJT812XFY

The SMAP Science Data System (SDS) team is working to correct the issue in forward processing. Until that time, files will continue to be affected with a frequency of approximately one half orbit per month. NSIDC DAAC will continue to identify and remove all affected files. Files currently affected are documented in a missing files spreadsheet, which will be updated and posted to the following How To article approximately once per month.

Users of L1B brightness temperature data will be able to identify affected files by looking at the first element in tb_lat, tb_lon, or ta_filtered_3. If the element contains the fill value -9999.00, the brightness temperatures stored in tb_v and tb_h will be invalid.

Users of L1C brightness temperature and L2 soil moisture data will need to identify the affected files based on the filenames or orbit numbers documented in the missing files spreadsheet (see the corresponding How To article).

All deleted files will be replaced during the next reprocessing from the beginning of the SMAP mission. Registered users will be notified when reprocessing occurs.

NSIDC Polaris Search and Order being Retired 15 February 2017

2 February 2017

THE NSIDC Polaris Search and Order tool will be retired on 15 February 2017. Please contact NSIDC User Services via email: nsidc@nsidc.org with questions.

Reprocessing Complete for Newly Released SMAP Radiometer Data

31 January 2017

The SMAP Science Data System (SDS) has completed reprocessing of the latest release of SMAP radiometer data products. As a result, the following products are now available from 31 March 2015 to the present:

SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture (SPL2SMP), Version 4
Data Set DOI: http://dx.doi.org/10.5067/XPJTJT812XFY

SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture (SPL3SMP), Version 4
Data Set DOI: http://dx.doi.org/10.5067/OBBHQ5W22HME

SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures (SPL1CTB_E), Version 1
Data Set DOI: http://dx.doi.org/10.5067/2C9O9KT6JAWS

SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture (SPL2SMP_E), Version 1
Data Set DOI: http://dx.doi.org/10.5067/CE0K6JS5WQMM

SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture (SPL3SMP_E), Version 1
Data Set DOI: http://dx.doi.org/10.5067/ZRO7EXJ8O3XI

SMAP L3 Radiometer Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State (SPL3FTP), Version 1
Data Set DOI: http://dx.doi.org/10.5067/RDEJQEETCNWV

SMAP Enhanced L3 Radiometer Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State (SPL3FTP_E), Version 1
Data Set DOI: http://dx.doi.org/10.5067/Z08PIR8RGVR2

New and Updated NASA SMAP Radiometer Products Now Available

19 December 2016

The SMAP Science Data System (SDS) has released several new and updated NASA Soil Moisture Active Passive (SMAP) radiometer data products at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The following products have been updated to Version 4:

SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture (SPL2SMP)
Data Set DOI: http://dx.doi.org/10.5067/XPJTJT812XFY

SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture (SPL3SMP)
Data Set DOI: http://dx.doi.org/10.5067/OBBHQ5W22HME

The primary change implemented in this version is the addition of data from the 6:00 p.m. ascending half-orbit passes, which provides increased spatial coverage.

In addition, the following products are new to the SMAP collection:

SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures (SPL1CTB_E)
Data Set DOI: http://dx.doi.org/10.5067/2C9O9KT6JAWS

SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture (SPL2SMP_E)
Data Set DOI: http://dx.doi.org/10.5067/CE0K6JS5WQMM

SMAP Enhanced L3 Radiometer Global Daily 9 km EASE-Grid Soil Moisture (SPL3SMP_E)
Data Set DOI: http://dx.doi.org/10.5067/ZRO7EXJ8O3XI

SMAP L3 Radiometer Northern Hemisphere Daily 36 km EASE-Grid Freeze/Thaw State (SPL3FTP)
Data Set DOI: http://dx.doi.org/10.5067/RDEJQEETCNWV

SMAP Enhanced L3 Radiometer Northern Hemisphere Daily 9 km EASE-Grid Freeze/Thaw State (SPL3FTP_E)
Data Set DOI: http://dx.doi.org/10.5067/Z08PIR8RGVR2

The new enhanced radiometer products (SPL1CTB_E, SPL2SMP_E, SPL3SMP_E, and SPL3FTP_E) obtain the maximum value from the SMAP radiometer by using Backus-Gilbert optimal interpolation techniques to provide data on a finer (9 km) grid posting than the standard 36 km.

The new radiometer freeze/thaw products (SPL3FTP and SPL3FTP_E) are daily composites of Northern Hemisphere freeze/thaw conditions retrieved by the SMAP radiometer.

As of 07 December 2016, the SMAP Science Data System (SDS) has begun forward processing all products listed above. Data reprocessing from the beginning of the SMAP mission to 07 December 2016 will begin in January 2017. Registered users will be notified when reprocessing is complete.

To access data, documentation, and tools, refer to the SMAP Web site at the NSIDC DAAC: http://nsidc.org/data/smap/

Select Files Removed from SMAP Data Sets

22 September 2016

Due to a problem with the Antenna Scan Angle file used to process the half-orbit 08619_D, the SMAP Science Data System (SDS) has removed the following files:

SMAP_L1A_RADIOMETER_08619_D_20160911T214948_R13080_001.h5
SMAP_L1B_TB_08619_D_20160911T214948_R13080_001.h5
SMAP_L1C_TB_08619_D_20160911T214948_R13080_001.h5
SMAP_L2_SM_P_08619_D_20160911T214948_R13080_001.h5

In addition, the SMAP Level-3 Soil Moisture Radiometer composite file that contains the affected half-orbit scan has been regenerated without half-orbit 08619_D in order to replace the errant file. The new file is:

SMAP_L3_SM_P_20160911_R13080_002.h5

If you have questions, please contact our User Services Office via e-mail: nsidc@nsidc.org. We apologize for any inconvenience this may cause.

Reprocessing Complete for SMAP Data

21 June 2016

The SMAP Science Data System (SDS) has completed reprocessing of the NASA SMAP Level-1B, -1C, -2, and -3 data products to Validated Version 3. Additionally, SMAP Level-4 products have been reprocessed to Validated Version 2.

During reprocessing, Level-1B, -1C, -2 and -3 data spanning the time period 19 November 2015 to 02 February 2016 were regenerated and replaced due to an issue with a spacecraft ancillary input file. The affected files end with R13080_001.h5. Users who currently have files within this date range may want to download the replacements, as portions of the right edge of the swath near 270° antenna azimuth were erroneously set to fill values.

Changes implemented in these versions are summarized on the SMAP Data Versions page: http://nsidc.org/data/smap/data_versions

To access data, documentation, and tools, visit the SMAP website at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC): http://nsidc.org/data/smap/

Note that SMAP Level-1 radar data and documentation are accessible through the NASA Alaska Satellite Facility Distributed Active Archive Center (ASF DAAC): https://www.asf.alaska.edu/smap/

File Removed from the SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures Data Set

1 June 2016

The SMAP_L1B_TB_01966_A_20150614T231537_R13080_001.h5 file was removed from the SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures Data Set because of a problem with the Antenna Azimuth file used to process this half-orbit. The SMAP Science Data System (SDS) is working to correct the Antenna Azimuth file and regenerate these half-orbits. Once we receive the new file, we will let you know.

If you have any questions, please contact our User Services Office via e-mail: nsidc@nsidc.org. We apologize for any inconvenience this may cause you.

File Removed from the SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures Data Set

1 June 2016

The SMAP_L1C_TB_01966_A_20150614T231537_R13080_001.h5 file was removed from the SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures Data Set because of a problem with the Antenna Azimuth file used to process this half-orbit. The SMAP Science Data System (SDS) is working to correct the Antenna Azimuth file and regenerate these half-orbits. Once we receive the new file, we will let you know.

If you have any questions, please contact our User Services Office via e-mail: nsidc@nsidc.org. We apologize for any inconvenience this may cause you.

New Versions of SMAP Products Available

2 May 2016

We are pleased to announce that the SMAP Science Data System (SDS) has begun reprocessing of all data and forward processing of the radiometer data to Validated Version 3 for the Level-1B, -1C, -2, and -3 data products and Validated Version 2 for the Level-4 data products. Registered users will be notified when reprocessing is complete.

Changes implemented in these versions are summarized on the SMAP Data Versions page at the NSIDC DAAC: http://nsidc.org/data/smap/data_versions

To access data, documentation, and tools, please see the SMAP Web site at the NSIDC DAAC: http://nsidc.org/data/smap/

Reprocessing Complete for NASA SMAP L2 and L3 Radar and Combined Radar/Radiometer Data

14 January 2016

The SMAP Science Data System (SDS) has completed reprocessing of NASA SMAP Level-2 and -3 radar and combined radar/radiometer data to Beta Version 2. The following data sets are now available for the full radar time series, 13 April 2015 to 07 July 2015, at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC):

SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture (SPL2SMA)
Data Set DOI: http://dx.doi.org/10.5067/6O6GPHUJ2QXM

SMAP L2 Radar/Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture (SPL2SMAP)
Data Set DOI: http://dx.doi.org/10.5067/LZIP2VM2GIA5

SMAP L3 Radar Global Daily 3 km EASE-Grid Soil Moisture (SPL3SMA)
Data Set DOI: http://dx.doi.org/10.5067/6QFA65R4RPOH

SMAP L3 Radar/Radiometer Global Daily 9 km EASE-Grid Soil Moisture (SPL3SMAP)
Data Set DOI: http://dx.doi.org/10.5067/F88YVH7CVNXS

SMAP L3 Radar Northern Hemisphere Daily 3 km EASE-Grid Freeze/Thaw State (SPL3FTA)
Data Set DOI: http://dx.doi.org/10.5067/GO4QPNEM0BKF

Reprocessing Complete for NASA SMAP Radiometer Data at NSIDC DAAC

9 December 2015

The SMAP Science Data System (SDS) has completed reprocessing of NASA SMAP Level-1, -2, and -3 radiometer data products to Version 2. The following data sets are now available for the full radiometer time series, 31 March 2015 to present, at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC):

SMAP L1A Radiometer Time-Ordered Parsed Telemetry (SPL1AP)
Data Set DOI: http://dx.doi.org/10.5067/JGV8EY3FGAH1

SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures (SPL1BTB)
Data Set DOI: http://dx.doi.org/10.5067/VIQYQV0AJATI

SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures (SPL1CTB)
Data Set DOI: http://dx.doi.org/10.5067/Y9C3Q3060AZ5

SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture (SPL2SMP)
Data Set DOI: http://dx.doi.org/10.5067/3Q9102MCFF72

SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture (SPL3SMP)
Data Set DOI: http://dx.doi.org/10.5067/7EW92T1NI4M4

Entire SMAP Radiometer and Radar Suite Now Available

4 November 2015

We are pleased to announce that all data from the NASA Soil Moisture Active Passive (SMAP) mission are now available at the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) and the NASA Alaska Satellite Facility Distributed Active Archive Center (ASF DAAC). The two NASA DAACs jointly manage SMAP science data on behalf of the NASA ESDIS Project.

SMAP combines coincident L-band radar and radiometer measurements to produce global, high-resolution soil moisture and freeze/thaw estimates. SMAP data available at the NSIDC DAAC include Level-1 through Level-4 radiometer data, Level-2 and Level-3 radar and combined radar/radiometer data, and Level-4 radiometer data. SMAP Level-1 radar data are available at the ASF DAAC.

Currently, Level-2 through Level-4 SMAP data are Beta-quality. Users should note that Beta-quality data use preliminary algorithms that are still being validated and are thus subject to uncertainties. Level-1 SMAP data have been processed to Validated. To access SMAP data and documentation, refer to the SMAP Data page.

SMAP Releases Level-2 and Level-3 Soil Moisture Data

14 September 2015

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is pleased to announce the release of SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture and SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture data sets.

These Level-2 (L2) and Level-3 (L3) soil moisture products provide gridded estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer.

SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 1 Beta
Data set DOI: http://dx.doi.org/10.5067/HF1KOE0Q85V7

SMAP L3 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 1 Beta
Data set DOI: http://dx.doi.org/10.5067/NTZW5L0XYP38

First Release of Instrument Data from the SMAP Mission

4 August 2015

We are pleased to announce that the beta version of Level-1 radiometer data from NASA’s Soil Moisture Active Passive (SMAP) mission is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). In addition, the beta version of Level-1 radar data is now available at the NASA Alaska Satellite Facility (ASF DAAC). SMAP combines coincident L-band radar and radiometer measurements to produce global, high-resolution soil moisture estimates.

As of 30 July 2015, the SMAP Science Data System (SDS) began forward processing Version 1 (beta) radiometer data, which will be made available at the NSIDC DAAC within 12 hours of satellite observation. Reprocessing of data from 31 March 2015 to 29 July 2015 to Version 1 has also begun and data will be made available as they are processed. This reprocessing is expected to be completed in the coming weeks, after which registered data users will receive an announcement.

The beta version (Version 1) of SMAP data sets available at the NSIDC DAAC include:

For Level-1 radar data, visit the ASF DAAC.

Data users should be aware that these data use preliminary algorithms that are still being validated and are thus subject to uncertainties. The validated release (Version 2) of all Level-1 data sets is expected to occur in the coming months, along with the beta release of the Level-2, -3, and -4 data sets.

New SMAPVEX12 Soil Texture Map Available

5 January 2015

New field campaign data from the Soil Moisture Active Passive Validation Experiment 2012 (SMAPVEX12) are now available at the NASA National Snow and Ice Data Center
Distributed Active Archive Center (NSIDC DAAC). The SMAPVEX12 Soil Texture Map incorporates soil texture classification data obtained from detailed soil surveys conducted near Winnipeg, Canada.

To access all currently available SMAPVEX12 data sets and documentation, visit the SMAP Validation Data Web page.

New SMAPVEX12 Data Available

20 August 2014

New validation field campaign data from the Soil Moisture Active Passive Validation Experiment 2012 (SMAPVEX12) are now available at the NASA National Snow and Ice Data Center
Distributed Active Archive Center (NSIDC DAAC), including:

To access all currently available SMAPVEX12 data sets and documentation, visit the SMAP Validation Data Web page.

New SMAPVEX12 Data Available at NSIDC

11 June 2014

We are pleased to announce that new validation field campaign data from the Soil Moisture Active Passive Validation Experiment 2012 (SMAPVEX12) are available at NSIDC.

The new SMAPVEX12 data sets include:

To access all currently available SMAPVEX12 data and documentation, visit the SMAP Validation Data Web page.

NSIDC Web Site and FTP Server Down for System Maintenance

29 May 2014

From 4:30 p.m. Wednesday, June 04 until noon Friday, June 06  (USA Mountain Time), our Web site and FTP server will be unavailable due to system maintenance. We apologize for any inconvenience this may cause you.

NSIDC Releases Soil Moisture Active Passive (SMAP) Web Site

19 March 2014

We are pleased to announce the release of the official NSIDC Soil Moisture Active Passive (SMAP) Web site. As the SMAP mission progresses, the SMAP Data Web site will provide one convenient location to access SMAP satellite and validation data, tools and services, data version history, news, published research, and other resources.

In addition, seven data sets are currently available from the SMAP Validation Experiment 2012 (SMAPVEX12). To access data and documentation from the SMAPVEX12 campaign, visit the SMAP Validation Data Web page.