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MODIS/Terra+Aqua BRDF/Albedo Model Parameters Daily L3 Global 500 m SIN Grid

Metadata Updated: February 21, 2024

The MODIS Near Real Time (NRT) MCD43A1N, MODIS Combined Aqua and Terra Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Model Parameters is produced daily using 16 days of Terra and Aqua MODIS data. This global gridded tiled product provides model parameters/coefficients (isotropic, volume and surface) for characterizing the BRDF of each pixel at 500m resolution in the sinusoidal map projection. BRDF at each pixel for the current day is derived by inverting all available good quality corrected surface reflectance observations acquired by Terra and Aqua MODIS from the 16-day period ending with the current data day. The daily observation are weighed as a function of quality, observation coverage and temporal distance from the current data date. Model parameters are stored as 3D datasets for each of the 7 land bands, visible, near-infrared and shortwave bands along with corresponding mandatory QA flags. There is a significant change in the science algorithm of the Collection 61 (C61) NRT BRDF/Albedo products and, therefore significant differences/discontinuities between the C6 and C61 products. C61 algorithm changes are intended to minimize the differences between the NRT and Standard BRDF. The C61 NRT BRDF code has been modified to allow for an extra round of magnitude inversion, following a full inversion using the full set of inputs. This extra magnitude inversion will only use the set of 9 days that are overlapping between standard and NRT, with the highest weight being assigned to the last day.

Additional information at MODIS Land Science Team website at

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date December 1, 2022
Metadata Updated Date February 21, 2024

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date December 1, 2022
Metadata Updated Date February 21, 2024
Identifier C2128952410-LANCEMODIS
Data First Published 2021-09-10
Language en-US
Data Last Modified 2024-03-05
Category Aqua, Terra, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation 2021-09-16. MODIS/Terra Aqua BRDF/Albedo Model Parameters Daily L3 Global 500 m SIN Grid. Version 6.1NRT. MODAPS at NASA/GSFC. Archived by National Aeronautics and Space Administration, U.S. Government, The Land, Atmosphere Near real-time Capability for EOS (LANCE).
Harvest Object Id 48c76cd9-db1c-42c7-96cc-26825cfb515e
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -180.0 -90.0 180.0 90.0
Program Code 026:001
Release Place MODAPS at NASA/GSFC
Source Datajson Identifier True
Source Hash 8ef1a57d92d9133591a2dde6e93ff37bcb3ea95703478392e0724615b77c23e3
Source Schema Version 1.1
Temporal 2021-09-15T00:00:00Z/2024-02-19T00:00:00Z

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