[gradsusr] Interpolation options in Grads In case of ocean data

[Subhajit Ghosh]

Hi everyone
I am using a global file .25deg resolution contains significant wave height
value. now some of the data are missing and I like to do a interpolation to
fill the gaps before making it to an image. Is there any option within
grads with which I can do so.
definition of the nc file pasted below :
netcdf wvhgt {
dimensions:
        latitude = 721 ;
        longitude = 1440 ;
        time = UNLIMITED ; // (24 currently)
variables:
        double latitude(latitude) ;
                latitude:units = "degrees_north" ;
                latitude:long_name = "latitude" ;
        double longitude(longitude) ;
                longitude:units = "degrees_east" ;
                longitude:long_name = "longitude" ;
        double time(time) ;
                time:units = "seconds since 1970-01-01 00:00:00.0 0:00" ;
                time:long_name = "verification time generated by wgrib2
function verftime()" ;
                time:reference_time = 1568160000. ;
                time:reference_time_type = 3 ;
                time:reference_date = "2019.09.11 00:00:00 UTC" ;
                time:reference_time_description = "forecasts or accumulated
(including analyses), reference date is fixed" ;
                time:time_step_setting = "auto" ;
                time:time_step = 3600. ;
        float WVHGT_surface(time, latitude, longitude) ;
                WVHGT_surface:_FillValue = 9.999e+20f ;
                WVHGT_surface:short_name = "WVHGT_surface" ;
                WVHGT_surface:long_name = "Significant Height of Wind
Waves" ;
                WVHGT_surface:level = "surface" ;
                WVHGT_surface:units = "m" ;

// global attributes:
                :Conventions = "COARDS" ;
                :History = "created by wgrib2" ;
                :GRIB2_grid_template = 0 ;

 Image output is also attached herewith

Thanks and regards
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