• NSIDC DAAC is currently upgrading our data ingest process for NASA Earthdata Cloud. During this transition, users may notice temporary interruptions in data availability or notice small data gaps. All gaps will be resolved as quickly as possible. During this upgrade jpeg browse imagery will also not be available for preview in Earthdata search. Please reach out to NSIDC User Services with any questions or concerns.

  • As of 01 September 2025, the NASA AMSR2 SIPS will stop processing and delivering updates to Advanced Microwave Scanning Radiometer Unified (AMSR Unified) data sets. For more information, see "User notice: Updates to NASA AMSR-E/AMSR2 Unified data sets to cease on 01 September 2025".

  • The NSIDC DAAC is retiring access to its legacy, on-premises data archive and transitioning to the NASA Earthdata Cloud as the primary data archive. View planned retirement dates here.

AMSR-E/AMSR2 Unified L2B Half-Orbit 25 km EASE-Grid Surface Soil Moisture, Version 1
Data set id:
AU_Land
DOI: 10.5067/IKQ0G7ODMLC7
This is the most recent version of these data.
Version Summary
Initial release

Overview

This Level-2B AMSR Unified product contains surface soil moisture at 25 km resolution, estimated from AMSR-E and AMSR2 brightness temperature observations using two different approaches: the Normalized Polarization Difference (NPD) algorithm and the Single Channel Algorithm (SCA). Data are provided in the NSIDC EASE-Grid Global projection. Soil moisture estimates are derived from AMSR-E and AMSR2 data which have been spatially resampled by the Japan Aerospace Exploration Agency (JAXA) to intercalibrate, or “unify,” the two sensors.
Parameter(s):
BRIGHTNESS TEMPERATURE
SOIL MOISTURE/WATER CONTENT
VEGETATION WATER CONTENT
Platform(s):
Aqua
GCOM-W1
Sensor(s):
AMSR-E
AMSR2
Data Format(s):
HDF-EOS5
Temporal Coverage:
  • 1 June 2002 to 4 October 2011
  • 2 July 2012 to present
Temporal Resolution:
  • 50 minute
Spatial Resolution:
  • 25 km
  • 25 km
Spatial Reference System(s):
  • NSIDC EASE-Grid Global
    EPSG:3410
Spatial Coverage:
  • N:
    89.24
    S:
    -89.24
    E:
    180
    W:
    -180
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.

Data Access & Tools

A free NASA Earthdata Login account is required to access these data. Learn More

Help Articles

General Questions & FAQs

This article covers frequently asked questions about the NASA NSIDC DAAC's Earthdata cloud migration project and what it means to data users.
The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is migrating its primary data access from its legacy, on-premises archive to the NASA Earthdata Cloud.

How to Articles

Many NSIDC DAAC data sets can be accessed using NSIDC DAAC's Data Access Tool. This tool provides the ability to search and filter data with spatial and temporal constraints using a map-based interface.Users have the option to:
To convert HDF5 files into binary format you will need to use the h5dump utility, which is part of the HDF5 distribution available from the HDF Group. How you install HDF5 depends on your operating system.
The NASA Earthdata Cloud is the NASA cloud-based archive of Earth observations. It is hosted by Amazon Web Services (AWS). Learn how to find and access NSIDC DAAC data directly in the cloud.
All data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is directly accessible through our HTTPS file system using Wget or curl. This article provides basic command line instructions for accessing data using this method.