Hi Dave,
Thanks. This is exactly what I am looking for.
best
simon
On Thu, Sep 2, 2010 at 6:00 PM, Dave Allured <dave.allured@xxxxxxxx> wrote:
> Simon,
>
> "Best way" depends on what software you have installed, how often you need
> to convert, file size, style preferences, etc. Here are some reasonable
> alternatives; there are other ways.
>
> 1. If you have NCO installed, use the ncap2 type conversion feature.
>
> http://nco.sourceforge.net/nco.html#Manual-type-conversion
>
> 2. Use ncdump to convert the file to CDL text, then edit using sed or your
> choice of stream editor.
>
> ncdump infile.nc | sed -e 's/double varname(/float varname(/' \
> > temp.cdl
> ncgen -o outfile.nc temp.cdl
>
> 3. For "small" files, do the same as (2), except use a manual text editor
> instead of sed. This may be the most expedient if you also need to fiddle
> with attributes or other metadata.
>
> With all methods, you may also need to perform type conversion on
> attributes directly related to the data variable, in particular _FillValue,
> missing_value, and/or valid_range.
>
> --Dave A.
> NOAA/PSD/CIRES
>
>
> On 9/1/2010 3:40 PM, Simon Su wrote:
>
>> Hi All,
>>
>> What would be the best way to convert a variable type within a netcdf
>> file?
>> I need to change a variable of the type double to float within a netcdf
>> file.
>>
>> thanks
>> Simon
>>
>
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