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20041122: [Fwd: [CF-metadata] U and V "grid relative" velocities]

>From: Rich Signell <address@hidden>
>Organization: USGS
>Keywords: 200411221446.iAMEkt7j001675 IDV grid relative values

Hi Rich-

>It seems we have an answer for how IDV should
>determine the orientation of vectors (grid-relative,
>or true east/north)
>
>>Date: Mon, 22 Nov 2004 14:17:49 +0000
>>To: address@hidden
>>Subject: [CF-metadata] U and V "grid relative" velocities
>>From: Jonathan Gregory <address@hidden>
>>
>>> It seems the proper way to specify this in CF is through the use of
>>> u:standard_name="sea_water_x_velocity"
>>> v:standard_name="sea_water_y_velocity",
>>> Is this right?
>>
>>Yes.
>>
>>The file might also contain northward and eastward velocity components. 
>>Velocity components relative to lat and lon and relative to the grid are
>>different quantities so need different standard names, I think, just like
>>northward and eastward components themselves have different names.
>>

Could you send me a file showing this?  It's not clear to me how
this would work in the real world.

Right now, there's no mechanism to flag a variable as "grid relative".
For the real-time model data, I've got a hack in, but this will take
some more thought.

Thanks for the pointer.

Don
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