Collection 6 Complete HDF File Format
The link below allows one to download and view the complete
Common Data Language (CDL) file specification. This file spec
gives a complete description of the MODIS Atmosphere Daily Global HDF product file,
including all the Scientific Data Sets and their local attributes.
Note that the file specs are identical for Terra and Aqua.
L3 Daily (08_D3) C6 File Spec (2.1 MB)
L3 Daily (08_D3) C51 File Spec (1.7 MB)