A question about polar stereographic projection

[Li,Guilong [Ontario]]

Dear Grads users,

I have a netcdf file with polar stereographic projection which can not
be opened by sdfopen. When I check the user group, I find I have to
write a control file to overwrite sdf file. After I tried several times
to write a new control file to open this netcdf file, it doesn't work.

Can someone help me about this question? Thanks a lot.

Guilong

Here is the ncdump -h output.

netcdf pr_MRCC_1979010103 {
dimensions:
        xc = 140 ;
        yc = 115 ;
        time = UNLIMITED ; // (5848 currently)
        bnds = 2 ;
variables:
        double yc(yc) ;
                yc:units = "m" ;
                yc:long_name = "y-coordinate of polar_stereographic
projection" ;
                yc:standard_name = "projection_y_coordinate" ;
                yc:axis = "Y" ;
                yc:coordinate_defines = "point" ;
                yc:actual_range = 0.f, 5700000.f ;
        double xc(xc) ;
                xc:units = "m" ;
                xc:long_name = "x-coordinate of polar_stereographic
projection" ;
                xc:standard_name = "projection_x_coordinate" ;
                xc:axis = "X" ;
                xc:coordinate_defines = "point" ;
                xc:actual_range = 0.f, 6950000.f ;
        double time(time) ;
                time:long_name = "time" ;
                time:calendar = "gregorian" ;
                time:standard_name = "time" ;
                time:axis = "T" ;
                time:units = "days since 1979-01-01 00:00:0.0" ;
                time:delta_t = "0000-00-00 03:00:00" ;
                time:coordinate_defines = "point" ;
                time:actual_range = 0.125f, 731.f ;
                time:bounds = "time_bnds" ;
        double lon(yc, xc) ;
                lon:units = "degrees_east" ;
                lon:long_name = "longitude" ;
                lon:standard_name = "longitude" ;
                lon:axis = "X" ;
                lon:actual_range = 199.8962f, 326.4349f ;
        double lat(yc, xc) ;
                lat:units = "degrees_north" ;
                lat:long_name = "latitude" ;
                lat:standard_name = "latitude" ;
                lat:axis = "Y" ;
                lat:actual_range = 20.60496f, 73.2522f ;
        char polar_stereographic ;

polar_stereographic:straight_vertical_longitude_from_pole = 263.f ;
                polar_stereographic:standard_parallel = 60.f ;
                polar_stereographic:false_easting = -3525000.f ;
                polar_stereographic:false_northing = -7525000.f ;
                polar_stereographic:latitude_of_projection_origin = 90.f
;
                polar_stereographic:grid_mapping_name =
"polar_stereographic" ;
                polar_stereographic:resolution_at_standard_parallel =
50000.f ;
        float pr(time, yc, xc) ;
                pr:units = "kg m-2 s-1" ;
                pr:type = "average" ;
                pr:long_name = "Precipitation" ;
                pr:standard_name = "precipitation_flux" ;
                pr:cell_methods = "time: mean (interval: 3 hours)" ;
                pr:missing_value = 1.e+20f ;
                pr:_FillValue = 1.e+20f ;
                pr:actual_range = 0.f, 0.003506777f ;
                pr:add_offset = 0.f ;
                pr:scale_factor = 1.f ;
                pr:coordinates = "lon lat" ;
                pr:grid_mapping = "polar_stereographic" ;
                pr:level_desc = "Surface" ;
                pr:grid_desc = "polar_stereographic" ;
        double time_bnds(time, bnds) ;

// global attributes:
                :institution = "Ouranos (Ouranos, Montreal, PQ, Canada)"
;
                :source =
"MRCC(2006):atmosphere:MRCCv4.2.0(50km,29levels):sea
ice:AMIPII:land:CLASSv2.7" ;
                :project_id = "NARCCAP" ;
                :realization = "1" ;
                :experiment_id = "present-day climate using NCEP/DOE
Reanalysis" ;
                :contact1 = "Sebastien Biner" ;
                :contact2 = "biner.sebastien at ouranos.ca" ;
                :contact3 = "550 Sherbrooke Ouest, 19e etage, Montreal,
PQ, H3A 1B9, Canada" ;
                :contact4 = "tel : (514)282.6464 poste 263" ;
                :history = "created 24/04/2004 by Ton Nom (netCDF3.6.1
udunits1.12.4)" ;
                :table_id = "Table 2" ;
                :Conventions = "CF-1.0" ;
}