Data Set ID:

SMEX04 ENVISAT ASAR Data: Arizona, Version 1

This data set is comprised of browse images acquired over the regional study area of Arizona, USA for the 2004 Soil Moisture Experiment (SMEX04). The experiment was conducted using the Advanced Synthetic Aperture Radar (ASAR) instrument on board the European Space Agency's (ESA) Environmental Satellite (ENVISAT). Cross-polarized C-band ASAR images were acquired for 09 September 2003 and 14 October 2003 in order to obtain a backscatter coefficient measurement over a range of natural vegetation types. However, the images provided here are only browse images and therefore cannot be used to derive backscatter coefficient values. Researchers interested in backscatter coefficient values must obtain the ASAR data. The total volume for this data set is approximately 8.3 megabytes. Data are available via FTP and are provided as JPEG image files. Also included and available via FTP are the following types of header files: HAN files, ASCII text files, and one INI file.

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.

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Geographic Coverage

Data Set Tabs

Temporal Coverage:
  • 2003-09-09
  • 2003-10-14
to present
Temporal Resolution:
Not specified
Sensor(s): ASAR
Spatial Coverage:
  • N: 32.57, S: 31.41, E: -109.01, W: -110.31

Spatial Resolution:
Not Specified
  • Radar > Radar Backscatter
Data Format(s):
  • ASCII Text (.txt)
  • JPEG
Data Contributor(s): Thomas Jackson, Rajat Bindlish, Rogier Van der Velde

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., R. Bindlish, and R. Van der Velde. 2009. SMEX04 ENVISAT ASAR Data: 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