MODIS Daily BRDF Model Parameters At 500-Meter Resolution

MCD43A1 Version 6 provides three model weighting parameters (isotropic, volumetric, geometric) for deriving land surface albedo and reflectance. The NASA LPCLOUD product is generated daily from 16 days of Terra and Aqua MODIS data at a 500-meter spatial resolution. This specific version was decommissioned on July 31, 2023.

Use Cases

• Model land surface albedo using the isotropic, volumetric, and geometric weighting parameters for MODIS spectral bands 1-7.
• Generate Nadir BRDF-Adjusted Reflectance (NBAR) by applying the provided model parameters to correct for sun-sensor geometry effects.
• Filter data quality by applying the band-specific quality flags and mandatory quality layers to isolate high-quality full inversion results.
• Analyze temporal changes in surface reflectance properties by utilizing the daily product temporally weighted to a central Julian date.

Strengths

• Daily global coverage at 500-meter spatial resolution.
• Provides model parameters for 10 spectral bands, including visible, NIR, and shortwave.

Limitations

• Version 6 contains known issues, particularly over arid bright surfaces, prompting the provider to recommend avoiding substantive use.
• Data product is decommissioned, superseded by Version 6.1.

Provenance

Source

NASA LPCLOUD, derived from MODIS instruments on Terra and Aqua satellites.

Collection Method

Produced daily using a 16-day rolling window of MODIS data, temporally weighted to the ninth day.

Time Range

Daily coverage; specific temporal range for Version 6 is null.

Freshness

Daily update frequency; last updated for this version on 2023-02-17.

Geography

Global.