MCD19A1 v006

MODIS/Terra+Aqua MAIAC Land Surface BRF Daily L2G Global 500 m and 1 km SIN Grid


PI: Alexei Lyapustin

Description

The MCD19A1 Version 6 data product is a Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Aqua combined Multi-Angle Implementation of Atmospheric Correction (MAIAC) Land Surface Bidirectional Reflectance Factor (BRF) gridded Level 2 product produced daily at 500 meter (m) and 1 kilometer (km) pixel resolutions. The MCD19A1 product is corrected for atmospheric gases and aerosols using a new MAIAC algorithm that is based on a time series analysis and a combination of pixel- and image-based processing. The MODIS MAIAC Land Surface BRF products provide an estimate of the surface spectral reflectance as it would be measured at ground-level in the absence of atmospheric scattering or absorption.

The MCD19A1 MAIAC Surface Reflectance data product includes 34 Science Dataset (SDS) layers: surface reflectance for bands 1-12, BRF uncertainty for bands 1-2, snow fraction, snow grain size, snow fit, Quality Assessment (QA) bits at 1 km, surface reflectance for bands 1-7 at 500 m, cosine of solar zenith angle, cosine of view zenith angle, relative azimuth angle, scattering angle, solar azimuth angle, view azimuth angle, glint angle, RossThick/Li-Sparse (RTLS) volumetric kernel, and RTLS geometric kernel at 5 km. A low-resolution browse image is also included showing surface reflectance band combination 1, 4, 3 created using a composite of all available orbits.

Each SDS layer within each MCD19A1 Hierarchical Data Format 4 (HDF4) file contains a third dimension that represents the number of orbit overpasses. This factor could affect the total number of bands for each SDS layer.

read more

Characteristics

Improvements/Changes from Previous Versions

No previous versions.

Product Maturity

Validation at stage 1 has been achieved for the MCD19A1 data product.

Collection and Granule

Collection

Characteristic Description
CollectionCombined MODIS
DOI10.5067/MODIS/MCD19A1.006
File Size~4 MB
Temporal ResolutionDaily
Temporal Extent2000-02-01 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers34
Columns/Rows2400 (500 m) and 1200 (1000 m) x 2400 (500 m) and 1200 (1000 m)
Pixel Size500 m and 1000 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Sur_refl1 Surface reflectance for band 1 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref2 Surface reflectance for band 2 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref3 Surface reflectance for band 3 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref4 Surface reflectance for band 4 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref5 Surface reflectance for band 5 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref6 Surface reflectance for band 6 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref7 Surface reflectance for band 7 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref8 Surface reflectance for band 8 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref9 Surface reflectance for band 9 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref10 Surface reflectance for band 10 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref11 Surface reflectance for band 11 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_ref12 Surface reflectance for band 12 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Snow_Fraction Snow fraction (1 km) N/A 16-bit signed integer -28672 N/A 0 to 10000 0.0001
Sigma_BRFn1 BRFn uncertainty over time, for band 1 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sigma_BRFn2 BRFn uncertainty over time, for band 2 (1 km) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Snow_Grain_Size Snow grain diameter (1 km) mm 16-bit signed integer -28672 N/A 0 to 32767 0.001
Status_QA QA bits (1 km) N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
Snow_Fit Land+Snow linear mixture model RMSE in bands 1,5,7 (1 km) N/A 16-bit signed integer -28672 N/A 0 to 30000 0.0001
Sur_refl_500m1 Surface reflectance 500 m for band 1 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_refl_500m2 Surface reflectance 500 m for band 2 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_refl_500m3 Surface reflectance 500 m for band 3 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_refl_500m4 Surface reflectance 500 m for band 4 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_refl_500m5 Surface reflectance 500 m for band 5 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_refl_500m6 Surface reflectance 500 m for band 6 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
Sur_refl_500m7 Surface reflectance 500 m for band 7 (500 m) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
cosSZA Cosine of Solar zenith angle (5 km) N/A 16-bit signed integer -28672 N/A 0 to 10000 0.0001
cosVZA Cosine View zenith angle (5 km) N/A 16-bit signed integer -28672 N/A 0 to 10000 0.0001
RelAZ Relative azimuth angle (5 km) N/A 16-bit signed integer -28672 N/A -18000 to 18000 0.01
Scattering_Angle Scattering Angle (5 km) N/A 16-bit signed integer -28672 N/A -18000 to 18000 0.01
VAZ View Azimuth Angle (5 km) N/A 16-bit signed integer -28672 N/A -18000 to 18000 0.01
SAZ Solar Azimuth Angle (5 km) N/A 16-bit signed integer -28672 N/A -18000 to 18000 0.01
Glint_Angle Glint Angle (5 km) N/A 16-bit signed integer -28672 N/A -18000 to 18000 0.01
Fv RTLS volumetric kernel (5 km) N/A 32-bit floating point -99999 N/A -100 to 100 N/A
Fg RTLS geometric kernel (5 km) N/A 32-bit floating point -99999 N/A -100 to 100 N/A

The MCD19 SDS layers are three dimensional. The total number of bands in each file is contingent upon the number of orbit overpasses (1-2 at the equator and up to 30 in Polar Regions). For example, a file with an orbit number of five will contain five bands for each SDS layer (i.e. Snow_Fraction will be recorded in 5 separate instances). Note that at high latitudes, only the first 16 orbits with the largest coverage are selected for processing per day in order to limit the file size.

Orbit information is stored in the Orbit_amount and Orbit_time_stamp attributes in the HDF file. The global metadata attributes of MODIS data products can be viewed in software such as HDFView and Panoply.

Product Quality

Product quality information is described beginning on page 9 of the User Guide.

Known Issues

  • The longname in the internal metadata is provided incorrectly. The correct longname is "MODIS/Terra and Aqua MAIAC Land Surface BRF Daily L2G Global 500 m and 1 km SIN Grid."
  • Known issues are described on page 14 of the User Guide.

Documentation

Using the Data

Access Data

Citation

DOI: 10.5067/MODIS/MCD19A1.006

About the Image

Combined MODIS Surface Reflectance Bands 1-4-3 data from the MCD19A1 product over part of west Africa, March 3, 2018.

View full-size image