[CF-metadata] MSG CPP standard name for time_offset_of_observation / pixel_delta_time

From: Steve Hankin <Steven.C.Hankin>
Date: Thu, 03 Feb 2011 16:26:46 -0800

[cross-posting this email to the cf-satellite list]

=====================================

On 2/3/2011 1:11 PM, Janine Goldstein Aquino wrote:
> Hi all,
>
> At NCAR/RAF we have netCDF files with multiple time frequencies in the
> same file:
>
> dimensions:
> Time = 18421;
> Sps1 = 1; // samples per second
> Sps25 = 25; // samples per second
> ...
> variables:
> int Time(Time);
> float var1(Time, sps1);
> float var2(Time, sps25);
> ...
>
> This is not CF compliant and we are concerned that users will not know
> to look
> for the subsecond dimension and recognize it as time.
>
> Reading your suggestion below, I can see us implementing another use
> for the
> attribute "coordinate_offset". I took a stab at the udunits compatible
> "units" value.
> Not quite sure how that would work...
>
> dimensions:
> Time = 18421;
> Sps25 = 25;
> variables:
> int time(Time) ;
> :standard_name = "time"
> :units = "seconds since 2010-08-15 10:09:00 +0000" ;
> ...
> int sps25(Sps25) ;
> :standard_name = "coordinate_offset" ;
> :ref_coordinate = "time" ;
> :units = "1/25 seconds since time" ;
> ...
> float var2(Time,sps25);
>
> All of Tim's comments about how to implement the :coordinates attribute
> apply here as well.
>
> Regards,
> Janine
>
Received on Thu Feb 03 2011 - 17:26:46 GMT