NISAR Beta Range Doppler Pixel Offsets for Satellite Coregistration

Beta version 1 products contain dense pixel offset layers derived from NISAR L-SAR data. The layers are generated via incoherent cross-correlation on coarsely coregistered Level 1 Single Look Complex products, with a nominal ground posting of 90 meters. These preliminary datasets are provided by the Alaska Satellite Facility (ASF) to familiarize users with data formats and parameters.

Use Cases

• Analyzing pixel offset layers to assess coregistration accuracy between two RSLC products.
• Developing outlier detection algorithms for unfiltered offset layers containing noise and outliers.
• Studying the impact of sensor mode and observation area on offset spacing, window size, and search radius parameters.
• Testing geometric coregistration methods that utilize sensor orbit ephemeris and Digital Elevation Model (DEM) data.

Strengths

• Pixel offset layers provided with a consistent nominal ground posting of 90 meters.
• Offsets derived from applying incoherent cross-correlation on coarsely coregistered Level 1 RSLC products.

Limitations

• Products are labeled as Beta, explicitly not intended for scientific research use.
• Offset layers are distributed without conventional post-processing, containing outliers and unfiltered noise.
• Specific row counts, geographic coverage, and temporal range are not provided in the description.

Provenance

Source

Alaska Satellite Facility (ASF) for NASA-ISRO Synthetic Aperture Radar (NISAR) mission.

Collection Method

Generated by applying incoherent cross-correlation on a pair of coarsely coregistered Level 1 Range Doppler Single Look Complex (RSLC) products, using sensor orbit ephemeris and a DEM for initial alignment.

Time Range

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Freshness

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Geography

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