Dear Jonathan and Michael,
> backward(s)_scattering_coefficient
> (I think it is better not to name it with no reference to the kind of surface, because backscattering coefficient can be used in satellite altimetry to study ice sheets, for example. Moreover some flags are used to discriminate if measurement is on ocean or land.)
OK. Could we put just "surface_" then (not "sea_surface_")? Scattering is also
possible within the atmosphere, and it is useful to distinguish.
>>I agree with you. In that case a possibility is surface_backwards_scattering_coefficient, or following Michael's suggestion a more precise surface_backwards_scattering_coefficient_of_radar_wave (no need to use "in" here )
> The only point where I have doubts is about the pair:
> mean_sea_surface_height_above_reference_ellipsoid (m)
> mean_sea_surface_height_above_geoid (m)
>
> Well, I already thought about using cell_methods, but I am not sure it is a good idea: the dataset is based in grid points, and actually the data themselves are not obtained by averaging sea_surface_height data (in facts it is a more complex computing). That's why I think maybe we should introduce standard names for these parameters too..Shouldn't we?
I am not clear yet what you mean. Is it a mean/average? If it is not a mean,
it doesn't seem logical to say "mean", whether in the standard name or the
cell_methods. "mean" is still all right, however, if it includes weights of
some kind. cell_methods does not specify precisely how the mean is calculated.
Could you explain a bit more about what the calculation is, to clarify this
point? How would you define it in more words?
>>Yes, sorry my answer was ambiguous: actually the dataset includes mean sea surface and mean dynamic topography ( to give you an idea here are two examples of such mean sea surfaces http://www.aviso.oceanobs.com/en/data/products/auxiliary-products/mdt/description-rio05/index.html and http://www.aviso.oceanobs.com/en/data/products/auxiliary-products/mss/description-cls01/index.html ). In the file data represent the point values of the geophysical field, positions are defined at grid points and not grid cells. I am not sure if this is really correct to use cell_methods=mean in such case?
Kind regards
Olivier
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Received on Fri Apr 11 2008 - 06:38:54 BST
