[cf-satellite] Coordinate variables - center vs. corner of the pixel

I'm wondering if there is a standard for center vs. corner when writing 
the coordinate variables for latitude/longitude or projection x/y of 
satellite imagery for netCDF?  GeoTIFF supports both conventions.  HDF 
appears to specify the UL corner of the pixel.  Has anyone settled on a 
convention for netCDF or CF Metadata in general?

Thanks,

-gail
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Gail Schmidt
Software Engineer
Stinger Ghaffarian Technologies (SGT, Inc.)
Contractor to the USGS Earth Resources Observation and Science (EROS) 
Center
Rapid City, SD  57701
605-394-2292   Phone
605-394-6078   Fax
gschmidt@xxxxxxxx

"You can't live a perfect day without doing something for someone who will 
never be able to repay you."  John Wooden