MCD19A1 v006

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Validation at stage 1 has been achieved for the MODIS MAIAC products. Further details regarding MODIS land product validation for the MCD19 data products are available from the MODIS Land Team Validation site.

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.

Quality assurance information should be considered when determining the usability of data for a particular science application. The ArcGIS MODIS-VIIRS Python Toolbox contains tools capable of decoding quality data layers while producing thematic quality raster files for each quality attribute.

The QC layer is stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret the QC layers.

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

• 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.

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