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change the attribute of varible in ECMWF forecat

Added by Guanhuan Wen 3 months ago

Hi all
I have a landsea file from the analysis (the initial time )of ECMWRF model forecast. The varible name is LSM_GDS0_SFC and var172 derived from ncl_filedump and cdo -showname, respectively. I want to change the forecast_time 0 to 6. I use cdo -setattribute,var172@forecast_time=6 infile outfil. I found that the attribute of forecast_time was not changed. How to change the attribute correctly? Thank you!

LANDSEA01220000012200001 (1.63 MB) LANDSEA01220000012200001

Replies (1)

RE: change the attribute of varible in ECMWF forecat - Added by Estanislao Gavilan 3 months ago

Hi Guanhuan,

I am not having any issue with that command. if you type 

cdo -f nc4 -setattribute,var172@forecast_time=6 LANDSEA01220000012200001 output.nc

and then

ncdump -h output.nc

You will see that the variable 172 has a new attribute called forcast_time=6. setattribute only changes the attribute name, it does not change your time axis. If you want to select the 6hour output or compute the 6 hour mean, you need to use the command selhour or timselmean

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