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

[Mike Fiorino]

hi  Subhajit et al.,

my regrid2() (I use the .c version re()) in opengrads.org, does the 
regridding you're looking for...and more...

ciao ciao 4 now,

Mike Fiorino (still doing (open)grads...since 1990)


On 2019-10-22 17:45, Jennifer M Adams wrote:
> The interpolation routines available with the lterp() function are fairly conservative, and will usually throw away a few data points around the perimeter of missing data — bilinear interpolation requires all four points, box averaging requires the grid box to be at least 50% populated with legitimate data values. If you want to invent data, you’ll also have to invent your own algorithm for doing it. Sorry!
> —Jennifer
>
>
>> On Oct 19, 2019, at 8:42 PM, Subhajit Ghosh <subhajitghosh08 at gmail.com> wrote:
>>
>> 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
>> <in_wvhgt.png>_______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
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> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
>
>
>
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