Data Set ID:

SMEX04 Two-Dimensional Synthetic Aperture Radiometer (2D-STAR) Brightness Temperatures, Arizona, Version 1

Notice to Data Users: The documentation for this data set was provided solely by the Principal Investigator(s) and was not further developed, thoroughly reviewed, or edited by NSIDC. Thus, support for this data set may be limited.

This data set includes dual-polarized L-band brightness temperature and soil moisture data measured by the Two-Dimensional Synthetic Aperture Radiometer (2D-STAR) instrument. An aircraft carrying the instrument was flown over Arizona, USA and Sonora, Mexico on various dates from 07 August to 26 August 2004 as part of the Soil Moisture Experiment 2004 (SMEX04). The 2D-STAR is a research instrument developed under the NASA Instrument Incubator Program with an aim to demonstrate the capability of the two-dimensional aperture synthesis radiometer at low frequency (approximately 1.4 GHz) to observe surface variables such as soil moisture and ocean salinity. Data are provided in tab-delimited ASCII text files and are available via FTP.

These data were collected as part of a validation study for the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E). AMSR-E is a mission instrument launched aboard NASA's Aqua Satellite on 04 May 2002. AMSR-E validation studies linked to SMEX are designed to evaluate the accuracy of AMSR-E soil moisture data. Specific validation objectives include assessing and refining soil moisture algorithm performance; verifying soil moisture estimation accuracy; investigating the effects of vegetation, surface temperature, topography, and soil texture on soil moisture accuracy; and determining the regions that are useful for AMSR-E soil moisture measurements.

Get Data

Geographic Coverage

Data Set Tabs

Temporal Coverage:
  • 2004-08-08
  • 2004-08-24 to 2004-08-26
Temporal Resolution:
1 day
Spatial Coverage:
  • N: 32.1, S: 29.6, E: -109.6, W: -110.2

Spatial Resolution:
Not Specified
  • Microwave > Brightness Temperature
Data Format(s):
  • ASCII Text (.txt)
Data Contributor(s): Thomas Jackson, David Le Vine, Dongryeol Ryu

We kindly request that you cite the use of this data set in a publication using the following citation. For more information, see Use and Copyright.

Jackson, T., D. Ryu, and D. M. Le Vine. 2009. SMEX04 Two-Dimensional Synthetic Aperture Radiometer (2D-STAR) Brightness Temperatures, Arizona, Version 1. [indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center.

Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA