[ferret_users] Question about regridding

[Ming Yang <myang@xxxxxxxxxxxxx>]

Hi, folks
    Here is my original dataset

topo.nc
LON = 0.5, 1.5, ..., 359.5
LAT = -89.5, -88.5, ..., 89.5

    I want this dataset to be regridded so that it shares the same
coordinates as the following dataset

atmym016910.t2m.nc
LON = 0, 5.625, ..., 354.375
LAT = -85.76059, -80.26878, ..., 80.26878, 85.76059

    Here is what I have done with ferret

yes? use atmym016910.t2m.nc
yes? use topo.nc
yes? show data
     currently SET data sets:
    1> ./atmym016910.t2m.nc
 name     title                             I         J         K
L
 T2M      Temperature at 2 Meter           1:64      1:32      ...
1:500

    2> ./topo.nc  (default)
 name     title                             I         J         K
L
 TOPO     TOPO                             1:360     1:180     ...
...

yes? let TOPO2=TOPO[G=T2M[d=1]]

     TOPO2 has the desired coordinate, the same as T2M. However, I notice
in TOPO2 the values for LON=0 are undefined. I think this is because
the LON=0 is outside the range of the orignial dataset, whose lon is from
0.5 to 359.5, and the ferret is not smart enough to wrap up the longitude
around and to make use of those values with LON=359.5. Does anyone know
how to fix this problem? Thank you in advance.


Best,
Ming