Dear all,
I was looking at the CF documentation and hoping to find an explicit example
of how a forecast is expressed. We have a lot of forecast data and we need
to be able to retain all the metadata regarding what the analysis was and
what forecast steps we are using.
Should we use the cell_methods attribute to denote that a forecast is being
used or have I just missed it in the documentation somewhere.
Here is an example and how I would guess I should encode it:
An ECMWF ERA-40 temperature forecast (3D grid of model data) calculated from
an analysis at 1999-01-01 00:00. The forecast itself is at the 24-hour
time-step so it is exactly a day forward in time from the analysis.
double time(time);
time:standard_name = "time" ;
time:units = "hours since 1999-01-01 00:00" ;
float temp(time,level,lat,lon);
temp:long_name = "Air temperature on model levels" ;
temp:standard_name = "air_temperature" ;
temp:units = "K" ;
temp:cell_methods = "time: forecast at end of time bounds" ;
temp:bounds = "bounds_time"
double bounds_time(time,nv): # nv=2
data:
time = 24 ;
bounds_time = 0, 24 ;
Comments please.
Ag
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Ag Stephens Ph : +44 (0)1235 446220
Data Scientist, Fax: +44 (0)1235 446314
British Atmospheric Data Centre,
Rutherford Appleton Laboratory,
Chilton, Didcot, OX11 0QX, U.K.
Email: A.Stephens at rl.ac.uk Web:
http://badc.nerc.ac.uk
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Received on Tue Jun 10 2003 - 01:23:58 BST
