Dear All, I did one more test. I regridded the data from the new regular grid to the original curvilinear grid using the ferret external function rect_to_curv to check if I were able to get the same results of the original curvilinear grid, but as you can see from the figure results are differents (green should be equal to black). Is there a sound explanation? Thanks for the help, Best Wishes Markus >----Messaggio originale---- >Da: markus.mingel@xxxxxxxxx >Data: 16/09/2011 15.17 >A: <ferret_users@xxxxxxxx> >Ogg: [ferret_users] Question about curv_to_rect_map > >Dear Ferretters, > >I'm using the function curv_to_rect_map to regrid a rotated pole grid to a >regular grid. >I don't have any problem running the script, but plotting the results after >the regridding I get a difference in global mean SST of about 1K. > >Here it is my script: > >define axis/x=0.5:359.5:1/modulo/units=degrees xax >define axis/y=-89.5:89.5:1/units=degrees yax >let dummy = y[gy=yax] + x[gx=xax] > >let lonin = LON[d=1] >let latin = LAT[d=1] > >let map = curv_to_rect_map(lonin,latin,dummy,2) > >save/clobber/file=curv_map.nc map >CANCEL VARIABLE map >USE curv_map.nc > >DEFINE VARIABLE/title="NEW SST " new_sst = curv_to_rect(sst[d=1],map >[d=2]) > >plot sst[i=@ave,j=@ave],new_sst[i=@ave,j=@ave] > >Obviously, after the regridding I don't expect to get 2 overlapped lines, but >I was surprised for a such difference. Do you have experience with that? Is it >maybe related to the average function in the curvilinear domains? > >Thanks for the info > >Best wishes >Markus >
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