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regridding problem (sub-global to global lat-long grid)



I'm trying to blend two data sets. One (variable hd3a) defined on 
    GRID GDK1
 name       axis              # pts   start                end
 XLONB     LONGITUDE          156 r   163.5W               8.5W
 YLATB     LATITUDE            97 r   36.75N               84.75N
The netcdf file was created in ferret.
I want to blend this data into data from another netcdf file (not
created in ferret) which has the global grid:
    GRID GBA1
 name       axis              # pts   start                end
 LON       LONGITUDE          360mr   179.5W(-179.5)       179.5E
 LAT       LATITUDE           180 r   89.5S                89.5N

however, when I try to regrid from GDK1 to GBA1, I get all data flagged
as bad data when using 
hd3b=hd3a[g=GBA1]

If I try 
hd3b=hd3a[g=GBA1@mod]
I get the following error:
 **ERROR: regridding: @MOD regridding to a non-modulo axis: HD3A

Regridding variables from the 2nd data set to GRID GDK1 does work
however (non-modulo regridding).

help

thanks

Lev



Lev Tarasoff -  Dept of Physics, University of Toronto,
                60 St. George St., Toronto, Ontario, CANADA, M5S 1A7
                Tel (519)-821-3555  Fax (416)-978-8905
                email: lev@atmosp.physics.utoronto.ca



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