Ian,
I suggest filing a request with Udunits support to restore "bits" as
a valid unit in Udunits-2. It was probably dropped by accident.
All unit strings from Udunits-1 should be inherited, with very
limited and documented exceptions.
http://www.unidata.ucar.edu/software/udunits/udunits-2/udunits2.html#Differences
--Dave
On 9/27/2011 5:08 AM, Culverwell, Ian wrote:
> *Hi Ros,*
> **
> *Many thanks - that's pretty clear.*
> **
> *I agree about the CF documentation - "udunits.dat" peppered all
> over the place. *
> **
> *We'll use a unit of '1' instead (our application need**s each
> variable to have a unit, even if CF doesn't!).*
> **
> *Best Regards,*
> *Ian.*
> **
> --------------------------------------------------------------------
> *From:* Rosalyn Hatcher [mailto:r.s.hatcher at reading.ac.uk]
> *Sent:* 27 September 2011 11:43
> *To:* Culverwell, Ian
> *Cc:* cf-metadata at cgd.ucar.edu
> *Subject:* Re: [CF-metadata] Is the "bits" unit CF-compliant?
>
> Hi Ian,
>
> The CF Checker using UDUNITS-2 to validate the units.
>
> This is another one of those units where UDUNITS-1 deemed it valid
> and UDUNITS-2 says it's invalid.
>
> I think the CF Document should be updated to specify validation
> against UDUNITS-2 and also to remove the reference to the
> udunits.dat file as this no longer exists at UDUNITS-2, instead xml
> files are used.
>
> Regards,
> Ros.
>
> On 26/09/11 12:10, Culverwell, Ian wrote:
>> **
>> *Sorry, didn't quite finish.*
>> **
>> *... it says:*
>> **
>> *ERROR (3.1): Invalid units: bits*
>> **
>> *So: is "bits" (or "bit") CF-compliant or not?*
>> **
>> *Thanks for any help,*
>> *Ian.*
>> **
>> **
>> ******
>> --------------------------------------------------------------------
>> *From:* Culverwell, Ian
>> *Sent:* 26 September 2011 12:09
>> *To:* cf-metadata at cgd.ucar.edu
>> *Cc:* Culverwell, Ian
>> *Subject:* Is the "bits" unit CF-compliant?
>>
>> *Hello,*
>> **
>> *The latest CF-compliance document suggests that we should look to
>> the udunits.dat file in the udunits package to find out if a
>> certain unit is CF-compliant. The latest version of udunits.dat I
>> have lists*
>> **
>> *bit P count*
>> **
>> *as an acceptable unit. Yet when I run a file with this unit
>> through the CF-compliance checker, it says:*
>> **
>> **
Received on Tue Sep 27 2011 - 12:33:42 BST
