Daily Global Surface Reflectance from MODIS Terra and Aqua Satellites

MCD19A1CMGO Version 6.1 provides daily, global surface spectral reflectance data from the MODIS instruments on Terra and Aqua satellites. The dataset includes Bidirectional Reflectance Factor (BRF) and Nadir BRDF-Adjusted Reflectance (NBAR) for bands 8-12, corrected for atmospheric gases and aerosols using the MAIAC algorithm. It is produced by LPCLOUD on a 0.05-degree Climate Modeling Grid.

Use Cases

• Analyze surface spectral reflectance changes over time using the daily BRF for bands 8-12.
• Normalize reflectance data to a fixed geometry for comparative studies using the BRF normalized to solar zenith angle 45° and nadir view.
• Calculate Nadir BRDF-Adjusted Reflectance for consistent nadir-view analysis using NBAR for bands 8-12.
• Assess data quality and filter observations using the Quality Assessment (QA) bits layer.
• Model solar illumination conditions for reflectance studies using the cosine of solar zenith angle data.

Strengths

• Data is corrected for atmospheric gases and aerosols using the Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm.
• Product includes 19 Science Dataset layers, including BRF, normalized BRF, NBAR, QA, and geometric angles.
• Provides daily global coverage on a 0.05-degree (approximately 5,600-meter) Climate Modeling Grid.

Limitations

• Known issues exist, requiring users to consult the MODIS/VIIRS Land Quality Assessment website for specific details.
• Specific row count, file size, and temporal coverage range are not provided in the input.
• The dataset's license and last update date are unknown.

Provenance

Source

LPCLOUD via NASA Earthdata (MODIS/Terra+Aqua instruments)

Collection Method

Satellite imagery processed with the MAIAC atmospheric correction algorithm.

Freshness

Daily

Geography

Global