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Imaging · collection · 2022

MODIS/Terra+Aqua BRDF Model Parameters Daily L3 Global 1km SIN Grid V061

Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/modis/mcd19a3d.061

The MCD19A3D Version 6.1 data product is a Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Aqua combined Bidirectional Reflectance Distribution Function (BRDF) Model Parameters gridded Level 3 product.

Description

Output daily at 1 kilometer (km) resolution, the Multi-angle Implementation of Atmospheric Correction (MAIAC) MCD19A3D product provides three coefficients (weights) of the RossThick/Li-Sparse (RTLS) BRDF model that can be used to describe the anisotropy of each pixel.

The retrievals represent cloud-free and low aerosol conditions. When snow is detected, gap-filled snow grain size and sub-pixel snow fraction are computed. The gap-filling process retains the parameter in MAIAC’s memory for each grid cell until updated with the latest cloud-free observation.

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The number of days since the last update is provided in a separate layer. Over snow-free land, MAIAC also reports gap-filled Normalized Difference Vegetation Index (NDVI) at 1 km resolution and gap-filled Nadir BRDF-Adjusted Reflectance (NBAR) at 250 m resolution in the red and near-infrared (NIR) bands. The MCD19A3 BRDF Model Parameters product contains the following Science Dataset (SDS) layers: RTLS isotropic kernel parameter (Kiso) for bands 1-8, the RTLS volumetric kernel parameter (Kvol) for bands 1-8, RTLS geometric kernel parameter (Kgeo) for bands 1-8, three snow parameters, NDVI, NBAR, and three separate layers for the number of days since last update to current day.

Known Issues

* Known issues are described in Section 6 of the User Guide.

  • An artifact was discovered in the NDVI1km and NBAR_250m layers over the southern polar region. The affected region shows false retrieval of data during the summer months. The artifacts occurred over permanently snow-covered areas where no meaningful NDVI retrieval is expected. A software fix was implemented for forward processing in June 2023. Existing data products will not be reprocessed. Affected dates are listed on the Land Data Operational Products Evaluation Quality Assessment note.
  • For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.

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Where it is published

Catalogue records · 3

Topics

Stated by source
Earth Observing System, Aqua · Earth Observing System, Terra (AM-1) · Moderate-Resolution Imaging Spectroradiometer · Normalized Difference Vegetation Index (Ndvi) · Reflectance · Snow Cover · Snow Grain Size · Vegetation Index
From keywords
Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
Inferred from text
Climate change science 69% · Imaging 75%
Provenance · 2 source records, 24 field assertions
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NASA Earthdata CMRC2484086411-LPCLOUD14 d agoJSON v1
NASA Data Portal1936bbf0-19a1-4205-b5a1-01c730dfd5e611 d agoJSON v1
FieldAssertionExtractorEvidence
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concepts[measured_variable].gcmd:earth-science/land-surface/surface-radiative-properties/reflectancesource · NASA CMRconnector:nasa_cmr@1.0.0
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