[CF-metadata] Example of forecast data

From: Jonathan Gregory <j.m.gregory>
Date: Wed, 23 Jul 2003 17:28:29 +0100

Dear Ag

> I hadn't thought about the introduction of an index dimension to describe
> the length of 'time' and 'validity time'.

I thought this was our intention for the case where you had various
combinations of analysis and forecast time e.g. 0, 6 and 12 h forecasts
from an analysis at 0Z, 0 and 6 h from 6Z and 0 h from 12Z. That makes
six altogether. Since you don't have every combination of analysis and
forecast time, you can't have two orthogonal time axes. What I meant was

 dimensions:
         time_index = 6 ;
 
 variables:
         double time(time_index);
          time:units="hours since 2003-7-23";
         double forecast_reference_time(time_index);
          time:units="hours since 2003-7-23";
         float myvar(time_index, lat, lon);
          myvar:coordinates="time forecast_reference_time";

 data:
        forecast_reference_time=0, 0, 0, 6, 6, 12;
        time=0, 6, 12, 6, 12, 12;

Best wishes

Jonathan
Received on Wed Jul 23 2003 - 10:28:29 BST