Possible extensions circa Winter 2011  1. Spectral bands  Define as dimension rather than coordinate variable  Pre-define band names  Pre-define by wavelength/frequency range  Proposal by Tom Whittaker  2. Data quality  Modifiers such as "percent_cloud_free"  3. Level 3-specific  Local/solar time  4. Level 2-specific  Orbital parameters/swath geometry  5. Level 1-specific  Calibration tables/engineering parameters

Whittaker proposal for spectral bands  Create two coordinate axis types ("wavelength" and "wavenumber") that can be recognized by the NetCDF library as defining a "spectral coordinate".  Similar to time dimension variable  New standard names also needed  center_wavelength, or wavelength  center_wavenumber, or wavenumber

CDL Example