Re: [ferret_users] Failed creating coord variable %%

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Antonio,
To explain a bit more, if we look at the output of ncdump that you show, this file isn't actually CF compliant even though it says in its global attributes that it adheres to the CF conventions.

The variable
    float l3m_data(time, depth, G3fakeDim0, G3fakeDim1) ;

has four dimensions listed, but only G3fakeDim0, G3fakeDim1 are described as coordinate variables in the file.  The time and depth coordinates are not listed among the coordinate variables. A CF-compliant file would have variables along these lines in the header:

        float depth(depth) ;
                depth:units = "meters" ;
                depth:axis = "z" ;
        double time(time) ;
                time:units = "hour since 1980-01-14 14:00:00" ;
                time:time_origin = "14-jan-1980 14:00:00" ;
                time:axis = "t" ;

and would list the coordinate values in the coordinate section.

In any case, I think that Ferret v6.3 would be able to handle this file.

Ansley

Ansley Manke wrote:

Hi Antonio,
What version of Ferret are you running?  This sounds like a bug that was in version 6.2 of Ferret but has been fixed in version 6.3.  Please try upgrading to version 6.3, following the directions on the downloads pages, http://ferret.pmel.noaa.gov/Ferret/downloads

Here is a thread of the Users List with some discussion of this.

http://www.pmel.noaa.gov/maillists/tmap/ferret_users/fu_2009/msg00587.html

Ansley

Antonio Rodríguez wrote:

Hi,

Trying to make a mask from my file, I get:

use dec.nc
let mask=if l3m_data lt 65535 then 0 else 1
save/file=mask.nc mask
LISTing to file mask.nc
 ** netCDF error:
 Failed creating coord variable %%

I couldn't find any trick after browsing the help pages. I don't know what's going on. Any idea?

Thanks!

Antonio

Bellow you could find the result from ncdumping my dec.nc file:

ncdump -h dec.nc
netcdf dec {
dimensions:
    G3fakeDim0 = 205 ;
    G3fakeDim1 = 145 ;
    depth = 1 ;
    time = UNLIMITED ; // (1 currently)
variables:
    float l3m_data(time, depth, G3fakeDim0, G3fakeDim1) ;
        l3m_data:Scaling = "linear" ;
        l3m_data:Slope = 0.000717185f ;
        l3m_data:Intercept = -2.f ;
        l3m_data:Scaling_Equation = "(Slope*l3m_data) + Intercept = Parameter value" ;
        l3m_data:_FillValue = 65535.f ;
        l3m_data:structureType = "Grid" ;
        l3m_data:unitsCategory = "science" ;
        l3m_data:units = "C" ;
        l3m_data:scale_factor = 1.f ;
        l3m_data:add_offset = 0.f ;
    float G3fakeDim0(G3fakeDim0) ;
        G3fakeDim0:scale = 0 ;
        G3fakeDim0:stride = 0.08333334f ;
        G3fakeDim0:gridReference = "edge" ;
        G3fakeDim0:axis = "Y" ;
        G3fakeDim0:standard_name = "latitude" ;
        G3fakeDim0:endValue = 47.f ;
        G3fakeDim0:units = "degrees" ;
        G3fakeDim0:scaleType = "linear" ;
        G3fakeDim0:startValue = 29.91667f ;
        G3fakeDim0:size = 205 ;
    float G3fakeDim1(G3fakeDim1) ;
        G3fakeDim1:scale = 0 ;
        G3fakeDim1:stride = 0.08333334f ;
        G3fakeDim1:gridReference = "edge" ;
        G3fakeDim1:axis = "X" ;
        G3fakeDim1:standard_name = "longitude" ;
        G3fakeDim1:endValue = 1.000005f ;
        G3fakeDim1:units = "degrees" ;
        G3fakeDim1:scaleType = "linear" ;
        G3fakeDim1:startValue = -11.08333f ;
        G3fakeDim1:size = 145 ;

// global attributes:
        :Conventions = "CF-1.0" ;
        :history = "Mon Oct  5 19:51:52 2009: ncecat -u time dec.nc dec.nc\n",
            "Mon Oct  5 19:51:47 2009: ncecat -u depth modisterra-dec2001.nc dec.nc" ;
        :nco_openmp_thread_number = 1 ;