The NSIDC Web site and data services are currently having intermittent problems and may be unavailable. We are working to restore these services as soon as possible and apologize for any inconvenience this may cause. Please contact NSIDC User Services for assistance.
This data set consists of browse images acquired by the C-band Active Microwave Instrument (AMI) onboard the European Remote Sensing Satellite 2 (ERS-2) and provides only a general quality assessment of the ERS-2 AMI data. The Precision Images (PRIs) were used as a part of the Soil Moisture Experiment 2002 (SMEX02) and are available to research groups from the European Space Agency (ESA). The data were obtained over the SMEX02 study area in Iowa, USA on 31 May, 5 July, and 13 September 2002. These images are uncalibrated, subsets of the raw ERS-2 AMI PRIs. The images are a function of decibels (dB) and are intended for browsing locations and general features. They cannot be used to derive dB values; researchers interested in dB values must obtain the AMI data.
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.
Jackson, T. and R. Van der Velde. 2004. SMEX02 European Remote Sensing Satellite (ERS-2) AMI Data, Iowa. [indicate subset used]. Boulder, Colorado USA: NASA DAAC at the National Snow and Ice Data Center.
|Data format||JPEG image files|
|Spatial coverage and resolution||41.308°N to 42.389°N, -93.913°W to -93.017°W|
|Temporal coverage and resolution||31 May 2002 to 13 September 2002
Data were gathered on 31 May, 5 July, and 13 September 2002
|File naming convention||Files use the convention ERSdaacmmddyy.jpg|
|File size||File sizes are between 4.07 MB and 4.67 MB|
|Parameter(s)||C-band backscatter browse scenes|
|Procedures for obtaining data||Data are available via FTP|
Thomas Jackson, Rogier Van der Velde
U.S. Department of Agriculture (USDA) Agriculture Research Service (ARS) National Soil Tilth Laboratory
NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449 USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
Data are JPEG format image files.
The image files use the convention: ERSdaacmmddyy.jpg. For example, the file acquired on 7 July 2002 is "ERSdaac070502.jpg."
File sizes range from 4.07 MB to 4.67 MB.
Southernmost Latitude: 41.308° N
Northernmost Latitude: 42.389° N
Westernmost Longitude: -93.913° W
Easternmost Longitude: -93.017° W
The spatial coverage of each scene is shown in Table 1.
Table 1. Coverage of the ERS-2 AMI scenes
Pixel spacing is 12.5 m.
Data were gathered on 31 May, 5 July, and 13 September 2002.
C-band radar backscatter browse images.
The following is a small sample of the image file "ERSdaac070502.jpg."
Data are available via FTP. (This data set gives only a general impression about the quality of the ERS-2 AMI data. Full ERS-2 data are available only by individual research groups from the ESA)
Table 2 below shows ordering information of the different scenes. Please contact the ESA to order the full ERS-2 AMI PRIs.
Table 2. Ordering information for the different ERS-2 scenes
Total volume of combined files is 13.3 MB.
The C-band Active Microwave Instrument (AMI) onboard the ERS-2 space platform provides backscatter measurements around incidence angles of 23° and at VV polarization.
The following acronyms and abbreviations are used in this document.
|AMI||Active Microwave Instrument|
|AMSR-E||Advanced Microwave Scanning Radiometer - Earth Observing System|
|ERS-2||European Remote Sensing Satellite|
|ESA||European Space Agency|
|FTP||File Transfer Protocol|
|SMEX||Soil Moisture Experiment|