Hi Roy,
The range would be specified within a file, one range for each
variable in the file, just like valid_min and valid_max. I didn't
mean "global" ranges for each standard name.
Cheers, Jon
On 12/21/06, Roy Lowry <rkl at bodc.ac.uk> wrote:
> Dear All,
>
> I'm not sure how this would work because the valid range could be a function of both the Standard Name and the Cell Method.
>
> Cheers, Roy.
>
> >>> "Jon Blower" <jdb at mail.nerc-essc.ac.uk> 12/21/2006 9:35 am >>>
> Dear all,
>
> As some of you know, we at Reading have developed an online,
> interactive visualization tool for CF-compliant NetCDF data
> (http://lovejoy.nerc-essc.ac.uk:8080/ncWMS/godiva2.html). In order to
> create images of the data that are stored in the NetCDF files, the
> tool needs to know a sensible range of possible data values. For
> example, for sea temperature a sensible range is -5 to 35 C.
>
> Many data files specify the valid_min and valid_max attributes: these
> define the range of all possible values - outside this range, data are
> interpreted as missing values and are thus "hard" boundaries. This
> range is often set very wide to ensure that no true data values are
> interpreted as missing.
>
> I think it would be useful if there were a similar pair of attributes
> (say "suggested_min" and "suggested_max") that are interpreted by
> visualization tools as clues to generating a sensible colour scale,
> but values outside this range are not interpreted as missing.
>
> Do others think this is sensible, and is there anything similar existing in CF?
>
> Thanks,
> Jon
>
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> Reading e-Science Centre Fax: +44 118 378 6413
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--
--------------------------------------------------------------
Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb at mail.nerc-essc.ac.uk
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
--------------------------------------------------------------
Received on Thu Dec 21 2006 - 02:52:36 GMT
