[ncl-talk] Can NCL automatically read in an integer variable with scale_factor and add_offset?

[Dennis Shea]

undef("int2flt_scale")
function int2flt_scale (xi)
begin
    xf = xi*xi at scale_factor + xi at add_offset
    xf at long_name = xi at long_name
    xf at units           = xi at units
    xf at missing_value = xf at _FillValue
    xf at valid_range= tofloat( xi at valid_range)
    copy_VarCoords(xi, xf)
    return(xf)
end

 f = addfile("foo.nc","r")

 soil_m = int2flt_scale( f->SOIL_M )
 printVarSummary(soil_m)
 printMinMax(soil_m, 0)



On Thu, May 17, 2018 at 11:05 AM, Yongxin Zhang <yongxin.fred at gmail.com>
wrote:

> I have a netCDF file, soil_m.nc, that contains only integer variables
> with scale_factor and add_offset, for example, SOIL_M looks like this:
>
> int SOIL_M(time, y, soil_layers_stag, x) ;
>
> SOIL_M:_FillValue = -999900 ;
>
> SOIL_M:missing_value = -999900 ;
>
> SOIL_M:long_name = "volumetric soil moisture" ;
>
> SOIL_M:units = "m3 m-3" ;
>
> SOIL_M:scale_factor = 0.01f ;
>
> SOIL_M:add_offset = 0.f ;
>
> SOIL_M:valid_range = 0, 100 ;
>
> After I opened the data file by issuing "fin=addfile("soil_m.nc","r")" in
> ncl and then I did "data1=fin->SOIL_M", "data2=tofloat(fin->SOIL_M)", and
> "data3=int2flt(fin->SOIL_M)" but in all cases the data range from 0 to 100
> instead of 0 to 1 or 0.0 to 1.0. I am just wondering if there is a way that
> NCL can automatically read in an integer variable with the scale_factor and
> add_offset applied.
>
> Thanks,
> Yongxin
>
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