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| USGS Earth Resources Observation and Science Center (EROS) |
SIR-C/X-SAR (Spaceborne Imaging Radar-C/X-band Synthetic Aperture Radar) was a joint project of the National Aeronautics and Space Administration (NASA), the German Space Agency (DARA) and the Italian Space Agency (ASI). Data were collected in L-Band and C-Band by SIR-C, and X-Band by X-SAR. Two types of image products were produced by the ground data processing systems: the Survey product and the Precision (Standard) product. JPL was responsible for Survey and Precision processing of the SIR-C data, while ASI was responsible for Survey processing of the X-SAR data. Precision processing of the X-SAR data was shared between the ASI and the DLR. The Precision product is a frame image of a subset of the data take (swath). Only a small percentage of the acquired data was processed into Precision products, whereas all of the science data were processed into Survey products. Flight 1 data processed before October 1, 1994 is not calibrated and flight 2 data processed before February 1, 1995 is not calibrated. However, the data can still be used for qualitative analysis. The Survey product is intended as a "quick look" browsing tool for viewing the areas imaged by SIR-C/X-SAR and is not designed to be used for quantitative scientific analysis.
From Fall 1996 to October 2002, the EDC DAAC assumed Precision product processing responsibilities. On October 2000, this responsibility was transitioned to the USGS at the Center for Earth Resources Observation and Science (EROS). Processing of new precison products was discontinued June 2005, after repeated system failures. However, Precision products produced prior to June 2005 can be ordered through EarthExplorer at http://earthexplorer.usgs.gov.
See the SIR-C products page for additional information.
Survey data products are also available for distribution via FTP at: http://edcsns17.cr.usgs.gov/sir-c/sir-c.html.
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