MCD43C4 v061

MODIS/Terra+Aqua BRDF/Albedo Nadir BRDF-Adjusted Reflectance Daily L3 Global 0.05 Deg CMG


PI: Crystal Schaaf

Historic processing continues for MODIS V6.1 data products for years 2011 through 2018. It is the intent to complete processing of the archive by the end of the 2021 calendar year. The V6 land products will be available until the V6.1 processing is completed, upon which time the MODIS V6 products will be decommissioned.

Description

The Moderate Resolution Imaging Spectroradiometer (MODIS) MCD43C4 Version 6.1 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Nadir BRDF-Adjusted Reflectance (NBAR) dataset is produced daily using 16 days of Terra and Aqua MODIS data in a 0.05 degree (5,600 meters at the equator) Climate Modeling Grid (CMG). Data are temporally weighted to the ninth day of the retrieval period which is reflected in the Julian date in the file name. This CMG product covers the entire globe for use in climate simulation models.

Users are urged to use the band specific quality flags to isolate the highest quality full inversion results for their own science applications as described in the User Guide.

MCD43C4 removes view angle effects from directional reflectances to model the values as if they were collected from a nadir view at local solar noon. These NBAR values are calculated from MCD43C1. The product includes separate NBAR layers for MODIS spectral bands 1 through 7 as well as ancillary layers for quality, local solar noon, percent finer resolution inputs, snow cover, and uncertainty.

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Characteristics

Improvements/Changes from Previous Versions

  • The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 - 2017.
  • A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).

Product Maturity

Validation at stage 3 has been achieved for all MODIS BRDF/Albedo products. Further details regarding MODIS land product validation for the MCD43 data products are available from the MODIS Land Team Validation site.

Collection and Granule

Collection

Characteristic Description
CollectionCombined MODIS
DOI10.5067/MODIS/MCD43C4.061
File Size~90 MB
Temporal ResolutionDaily
Temporal Extent2000-02-16 to Present
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumN/A
File FormatHDF-EOS
Geographic DimensionsGlobal

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers12
Columns/Rows7200 x 3600
Pixel Size5600 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Nadir_Reflectance_Band1 Nadir reflectance for MODIS band 1 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
Nadir_Reflectance_Band2 Nadir reflectance for MODIS band 2 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
Nadir_Reflectance_Band3 Nadir reflectance for MODIS band 3 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
Nadir_Reflectance_Band4 Nadir reflectance for MODIS band 4 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
Nadir_Reflectance_Band5 Nadir reflectance for MODIS band 5 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
Nadir_Reflectance_Band6 Nadir reflectance for MODIS band 6 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
Nadir_Reflectance_Band7 Nadir reflectance for MODIS band 7 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Quality Global albedo quality N/A 8-bit unsigned integer 255 N/A 0 to 254 N/A
Local_Solar_Noon Local solar noon zenith angle Degree 8-bit unsigned integer 255 N/A 0 to 90 N/A
Percent_Inputs Processed finer resolution data that contributed to this CMG pixel Percent 8-bit unsigned integer 255 N/A 0 to 100 N/A
Percent_Snow Underlying data flagged as snow Percent 8-bit unsigned integer 255 N/A 0 to 100 N/A
BRDF_Albedo_Uncertainty BRDF inversion information N/A 16-bit unsigned integer 32767 N/A 0 to 32766 0.001

Quality bit index

Value Description
0 Best quality, 100% with full inversions
1 Good quality, 75% or more with best full inversions and 90% or more with full inversions
2 Relative good quality, 75% or more with full inversions
3 Mixed, 75% or less full inversions and 25% or less fill values
4 All magnitude inversions or 50% or less fill values
5 50% or more fill values
255 Fill Value

Known Issues

For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.


About the image

Combined MODIS BRDF Albedo nadir reflectance band 1 data from the MCD43C4 product across the globe, August 2 - 17, 2020.

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Documentation

User Guide
Algorithm Theoretical Basis Document (ATBD)
File Specification

Using the Data

Access Data

Citation

DOI: 10.5067/MODIS/MCD43C4.061