data values are outside the valid range of the used output precision!
Added by Yan Zhao over 5 years ago
Hello,
When I typed the simple cdo command as "cdo mulc,0.6 input.nc output.nc", the following informations appeared:
Warning: Some data values (min=-53222 max=-16750) are outside the
valid range (-32768 - 32767) of the used output precision!Use the CDO option -b F32 or -b F64 to increase the output precision.cdf_put_vara_double: name=sp type=NC_SHORT minval=-53222.000000 maxval=-16750.000000
Error (cdf_put_vara_double): NetCDF: Numeric conversion not representable
The information of the input data (attached) is as such:
.........
short sp(time, lat, lon) ;
sp:standard_name = "surface_air_pressure" ;
sp:long_name = "Surface pressure" ;
sp:units = "Pa" ;
sp:add_offset = 76390.8482127444 ;
sp:scale_factor = 0.862168261124166 ;
sp:_FillValue = -32767s ;
sp:missing_value = -32767s ;
I attempted to use ncatted to change the _FillValue from 32767 to others values as 999999 or 1.0e36. With the command of "cdo mule,0.6 ....", the similar error information " outside the valid range" still existed.
What's the problem of valid range? How to use cdo -b F32 or F64 if it works?
Any help is appreciated!
Yana
| ERA5_Psurf_1980Jan.nc (19.1 KB) ERA5_Psurf_1980Jan.nc |
Replies (2)
RE: data values are outside the valid range of the used output precision! - Added by Karin Meier-Fleischer over 5 years ago
Hi Yan,
the variable sp is of type short which causes the error when you try to multiplicate it with a float.
CDO tells you what is going on and how to fix it:
cdo mulc (Warning): Some data values (min=-53222 max=-16750) are outside the
valid range (-32768 - 32767) of the used output precision!
Use the CDO option -b F32 or -b F64 to increase the output precision.
cdf_put_vara_double: name=sp type=NC_SHORT minval=-53222.000000 maxval=-16750.000000
cdo -b F32 -mulc,0.6 ERA5_Psurf_1980Jan.nc outfile.nc
Read the warnings and error messages carefully aswell as the options part of the CDO documentation for the meaning of -b F32.
-Karin
RE: data values are outside the valid range of the used output precision! - Added by Yan Zhao over 5 years ago
Thanks Karin for your reply. I got it. It seems so simple but works well.