JPSS-2 CrIS IMG_COL: Collocation Indices for VIIRS and CrIS Satellite Data

2223 hyperspectral channels from the CrIS instrument provide radiance measurements across shortwave, midwave, and longwave infrared bands. This supplementary product from NASA's GES DISC contains array indices linking CrIS footprints to collocated VIIRS imager pixels, enabling data fusion. The indices allow users to augment CrIS Level 1B radiance data with additional VIIRS product information.

Use Cases

• Fusing hyperspectral radiance data with high-resolution imagery based on the provided collocation indices
• Extracting VIIRS cloud mask or radiance data for specific CrIS footprints using the array index values
• Augmenting CrIS atmospheric sounding analyses with collocated VIIRS sea surface temperature or ocean color data
• Developing cross-instrument calibration or validation methods based on the CrIS-VIIRS matchup indices

Strengths

• Provides 2223 spectral channels across three infrared wavelength ranges (shortwave, midwave, longwave)
• Links each CrIS field-of-view (9 per field-of-regard) to collocated VIIRS pixels from the same NOAA-21 platform
• Data products are constructed on six-minute boundaries, suggesting regular temporal coverage

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Data collected by the Cross-track Infrared Sounder (CrIS) and Visible Infrared Imaging Radiometer Suite (VIIRS) instruments on the NOAA-21/JPSS-2 satellite.

Freshness

Last updated 2026-03-13 01:29:26.293275; freshness should be verified

Geography

Global coverage from polar satellite observations.