NISAR Beta Geocoded Pixel Offsets for Radar Coregistration

NISAR Beta Geocoded Pixel Offsets (GOFF) are Level 2 products derived from Range Doppler Pixel Offsets, projected onto an 80-meter geographical grid using orbit data and a Digital Elevation Model. The dataset contains pixel offset shift layers between coarsely coregistered radar granules, distributed without conventional post-processing. These Beta products from NASA and ISRO, managed by the ASF, are intended for user familiarization and not for formal scientific research.

Use Cases

• Analyze pixel offset layers to assess initial coregistration accuracy between RSLC granule pairs.
• Study the signal-to-noise ratio (SNR) data layer to evaluate quality of the derived pixel offsets.
• Examine offset outliers present in the unfiltered layers to understand noise characteristics in beta products.
• Utilize the geocoded data on its UTM or polar stereographic grid for spatial analysis of displacement patterns.

Strengths

• Data is geocoded to a consistent 80-meter posting grid for spatial analysis.
• Contains multiple data layers including pixel offsets and associated SNR information.
• Products are derived using a defined geocoding algorithm with bilinear interpolation for floating-point data.

Limitations

• Pixel offset layers contain outliers as no post-processing filtering was applied.
• Data is labeled as Beta quality, explicitly not intended for scientific research use.
• Specific spatial coverage, temporal range, and volume metrics (rows, size) are unknown.

Provenance

Source

NASA-ISRO Synthetic Aperture Radar (NISAR) mission, data managed by ASF (Alaska Satellite Facility).

Collection Method

Derived from Range Doppler Pixel Offsets (ROFF) products, geocoded using reference RSLC orbit and a DEM.

Time Range

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Freshness

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Geography

Coverage depends on NISAR observation areas; data is projected to UTM or polar stereographic grids.