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On 24/10/11 19:36, Tom Whittaker wrote:
> Pete:
>
>>> - - On the cf-satellite list, we have long been discussing "band"s. Did you
>>> consider using those ?
>>>
>>> Sorry, I don't know what bands are.
>
> I just wanted to reinforce Martin's comments. The motivation behind
> having a 3rd "dimension" which is the band (or channel) is to provide
> applications that deal with spectra displays an easier time of getting
> at the band (channel) data for a single pixel. The HYDRA application
> is one such example. There are also potential for more efficiently
> representing common metadata as well. The reason to push on this is
> because there is no widely-accepted convention for this, and datasets
> are being created with a variety of ways of handling bands (from
> separate files, to separate variables, to the use of a 3rd dimension),
> and applications need to be able to easily recognize that a dimension
> is a "band" and not, for example, an "altitude" or "pressure level".
>
> The main issue is deciding whether this "dimension" should also be a
> "coordinate variable" as some have recommended. I believe the
> consensus right now is that it does not have to be, but it must have
> at least a "standard_name" to identify it uniquely as a "band"
> ("channel").
Yes, this is exactly what makes it nice: we don't care how the variable
is called as long as the standard_name is "band". In this way, the
reading of the file is not dependent on knowing the names for each
channel, but a generic reading that handles most satellite data in this
format files can be implemented.
Best regards,
Martin
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