[ncl-talk] Plotting SAF Sea Ice Contours from Eumetcast

[Francis Greaves]

I am an Amateur Weather Enthusiast and have been receiving Eumetcast data for many years. 

I am trying to move away from Windows, because I have been a Linux user for many years as well. 

I have been using David Taylor's excellent suite of programs to look at data including the Sea Ice product from SAF but this is written for Windows, and I am using wine to run it. I really want to move to Linux Only! 



The product is in Polar Stereographic Projection 



I have installed ncl fine using version 6.3.0 on CentOS 7 

I can convert the Grib1 files to netCDF using ncl_convert2nc 



I cannot see how to write a script (I have not found one on your site) to create the image. 



Here is the output of ncl_filedump (the Grib file is 1.8Mb, the netCDF file is 13.6Mb) 

------------------------------------------------------------ 

warning:GribOpenFile: Grid Description Section not consistent with NCEP documention of grid 5; using GDS values for variables with this grid 

Variable: f 
Type: file 
filename: S-OSI_-NOR_-MULT-GL_NH_CONC__-201602121200Z 
path: Documents/S-OSI_-NOR_-MULT-GL_NH_CONC__-201602121200Z.grb 
file global attributes: 
dimensions: 
gridx_5 = 1120 
gridy_5 = 760 
variables: 
float ICE_C_5_SFC ( gridx_5, gridy_5 ) 
center : Oslo 
long_name : Ice concentration (ice=1;no ice=0) 
units : fraction 
_FillValue : 1e+20 
coordinates : gridlat_5 gridlon_5 
level_indicator : 1 
gds_grid_type : 5 
parameter_table_version : 1 
parameter_number : 91 
forecast_time : 0 
forecast_time_units : hours 
initial_time : 02/12/2016 (12:00) 

float gridrot_5 ( gridx_5, gridy_5 ) 
long_name : vector rotation angle 
GridType : Polar Stereographic Projection Grid 
units : radians 
formula_u : Ugrid = cos(rot)*Uearth - sin(rot)*Vearth 
formula_v : Vgrid = sin(rot)*Uearth + cos(rot)*Vearth 
note1 : u and v components of vector quantities are resolved relative to earth 
note2 : apply formulas to derive u and v components relative to grid 

float gridlat_5 ( gridx_5, gridy_5 ) 
corners : ( 33.975, 33.07173, 27.59339, 28.35711 ) 
long_name : latitude 
GridType : Polar Stereographic Projection Grid 
units : degrees_north 
ProjectionCenter : north 
Dy : 10000 
Dx : 10000 
Lov : -45 
Lo1 : -80.73 
La1 : 33.975 

float gridlon_5 ( gridx_5, gridy_5 ) 
corners : ( -80.73, -7.803853, 102.2406, 166.3792 ) 
long_name : longitude 
GridType : Polar Stereographic Projection Grid 
units : degrees_east 
ProjectionCenter : north 
Dy : 10000 
Dx : 10000 
Lov : -45 
Lo1 : -80.73 
La1 : 33.975 

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I would be grateful if someone could point me in the right direction. I have done a lot of programming over the years in C, Java, Python, Perl etc. 



Regards 

Francis 
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