MODIS-Aqua Collection 5.1 data is now being received into the Giovanni system as it is being delivered from the data provider (MODAPS). There may still be a few data gaps as this process continues until all of the data has been delivered.
Here is a short description of the changes in the Collection 5.1 data:
The principal changes are:
- improvements to the Deep Blue Aerosol retrieval;
- improved (non-Lambertian) parameterization of the surface BRDF effect;
- cloud screening and QA/QC flag selection leading to improved accuracy over bright reflecting surfaces; and
- a fix to the Rayleigh correction code that was causing some dropouts of the Cloud Optical Thickness retrieval over land.
The Deep Blue Aerosol Optical Depth at 550nm (Land) is currently only available in the MODIS Terra and Aqua Daily Level-3 Data instance. This data product will be available in the MODIS Terra and Aqua Monthly Level-3 Data instance in the future.
For a complete description of the Collection 5.1 changes, read:
MODIS-Atmosphere Collection 051 Changes, Version 01 (PDF)