Envisat ASAR Wide Swath Mode Level Zero Radar Echo Data

Envisat ASAR Level 0 products contain raw, time-ordered echo samples compressed to 4 bits per sample using FBAQ. The European Space Agency systematically produced this data for all acquisitions in the instrument's Wide Swath Mode, which covers a 400 km by 400 km area. The dataset's last recorded update was in April 2012.

Use Cases

• Develop custom SAR processing chains using the raw time-ordered AISPs and mandatory SAR processing information.
• Analyze the performance of the 4-bit/sample FBAQ compression algorithm on wide-swath radar echoes.
• Study the characteristics of the five individual image swaths (SS1 to SS5) that compose each Wide Swath Mode acquisition.
• Calibrate or validate other SAR datasets by comparing processed outputs from this foundational Level 0 product.

Strengths

• Provides foundational Level 0 raw data essential for custom SAR image processing.
• Each acquisition covers a significant 400 km by 400 km ground area.

Limitations

• Data is over a decade old, with the last update recorded in 2012, limiting analysis of recent phenomena.
• Specific sample size, row counts, and detailed acquisition frequency are not provided.

Provenance

Source

European Space Agency (ESA), via NASA Earthdata platform.

Collection Method

Systematically produced from the Envisat ASAR instrument while operating in Wide Swath (ScanSAR) Mode.

Time Range

null

Freshness

Last updated 2012-04-08; update frequency is null.

Geography

Global coverage within the 400 km swath width of the satellite's orbit segments.