Hi Nitin, To use shade you need to create a 2D variable. There are several ways to that. In the attached (modified) script I've used RESHAPE to do that because your data is on a regular (easy to define) grid. Cheers, Paulo ---------------- On Wed, 2014-09-17 at 10:52 +0530, Nitin Patil wrote: > Dear ferret users, > > > I am having a ascii file which includes 3 column (lat, lon, values of > CO), Now I am trying to convert this into a netcdf to see a spatial > variability. > > I am able to read the ascii but while saving it is not saving in the > I(lat) J(lon) format so that I can command in ferret shade > CO[x=65:95,y=5:40];go land to get spatial plot. > > > Please find the attached script and supporting file. Kindly let me > know if anyone knows. > > > -- > Regards, > Nitin Patil
cancel data/all FILE/VAR="lat,lon,co"/COLUMNS=3 ascii_to_nc.txt !------------------------------------ Guess axis ranges -------------- let lon_min = lon[i=@min] let lon_max = lon[i=@max] let lon_stepi = lon[i=@shf:1] - lon let lon_step = lon_stepi[i=1] !--- OK only because it's constant let lon_min_msk = if lon eq `lon[i=1]` then 1 let lat_at_lon_min = compressi(lat*lon_min_msk) let lat_min = lat[i=@min] let lat_max = lat[i=@max] let lat_stepi = lat_at_lon_min[i=@shf:1] - lat_at_lon_min let lat_step = lat_stepi[i=@ave] !---------------------------------------------------------------------- def ax/x=`lon_min`:`lon_max`:`lon_step`/units=LONGITUDE xlo def ax/y=`lat_min`:`lat_max`:`lat_step`/units=LATITUDE yla def gr/x=xlo/y=yla grd let co2d = reshape(co, x[g=grd]+y[g=grd]) shade co2d go land_detail frame/file=co2d.gif save/clob/file=temp.nc co2d
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co2d.gif
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temp.nc
Description: Cdf file
