Envisat ASAR Sea-Ice Motion Vectors, 2007-2011

Envisat satellite data provides high-resolution sea-ice motion vectors derived from C-band ASAR imagery for the austral winters from 2007 to 2011. The data was produced by the Australian Antarctic Data Centre using image-crosscorrelation analysis on overlapping SAR scenes with a pixel size of 75 meters. The dataset was last updated in November 2011.

Use Cases

• Tracking sea-ice drift and deformation based on displacement vectors derived from overlapping SAR images.
• Analyzing seasonal and interannual variability in Antarctic sea-ice motion based on data from 2007-2011.
• Validating or improving sea-ice models using observational motion data with a spatial resolution of approximately 150 meters.
• Studying the relationship between sea-ice motion and oceanographic or atmospheric forcing in the Southern Ocean.

Strengths

• Data is derived from Envisat's Advanced Synthetic Aperture Radar (ASAR), which operated from 2002 to 2012.
• Covers five austral winter seasons from 2007 to 2011.
• Uses image pairs with short time separation, ideally 6 days or less, for motion tracking.
• Spatial resolution is approximately 150 meters by 150 meters for Wide Swath Mode products.

Limitations

• Last updated 2011-11-30 23:59:59.999000; freshness should be verified.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Australian Antarctic Data Centre (AU_AADC) using European Space Agency (ESA) Envisat ASAR data.

Collection Method

Sea-ice motion derived via semi-automated image-crosscorrelation analysis (IMCORR/IPADS) on overlapping SAR image pairs.

Time Range

2007 to 2011 (austral winters, May-November).

Freshness

Last updated 2011-11-30 23:59:59.999000

Geography

Likely focuses on Antarctic regions, given the mention of austral winters and a cited study on East Antarctic sea ice.