[1] The NCEP data are North ==> South.
The functions want South ==> North
See Example 5 at
http://www.ncl.ucar.edu/Applications/wind.shtml
[2] Technically, the spherical harmonics give "highly accurate" results.
[3] In the following, please read *all* the appropriate documentation.
Regrid: See Example 9 at
http://www.ncl.ucar.edu/Applications/regrid.shtml
or
See Example 1 at
http://www.ncl.ucar.edu/Applications/ESMF.shtml
Use: INTERP_METHOD = "conservative"
Change:
;---Destination file options
Opt@DstGridType = "5x5" ; 5x5 degree grid
Opt@DstLLCorner = (/ -60.d, 0.d/)
Opt@DstURCorner = (/ 60.d, 355.d/)
To:
;---Destination file options
Opt@DstGridType = "2.5x2.5"
You do not need the 'DstLLCorner' and 'DstURCorner' because
you are creating a global grid but uopu can keep them by stting:
Opt@DstLLCorner = (/ -90.d, 0.d/)
Opt@DstURCorner = (/ 90.d, 357.5.d/)
On 11/30/13 7:45 PM, Wang, Yaoping wrote:
> Hi all,
>
> I am calculating divergence and vorticity in the North America from NCEP 10m winds data. There are two possible methods:
> uv2dvG, uv2vrG (requires global data)
> and
> uv2dv_cfd, uv2vr_cfd
> It turns out the two methods generate somewhat different results. Which one am I supposed to trust more?
>
> Also, I wish to regrid the NCEP precipitation on gaussian grid to a fixed 2.5x2.5 grid. Since it is not a smooth-varying variable and also bound to >=0, is there any suggestions which method should I use?
>
> Thanks a lot for any help,
> Yaoping Wang
>
>
>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Mon Dec 2 08:24:07 2013
This archive was generated by hypermail 2.1.8 : Wed Dec 04 2013 - 20:42:38 MST