[ncl-talk] issue with wrf_user_ll_to_ij

[Bill Ladwig]

Hi Yu,

There is a useTime value you can set in the opt argument.  See:

http://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_ll_to_ij.shtml

opt = True
opt at useTime = 2

Then pass this as the last argument to wrf_user_ll_to_ij.

Hope this helps,

Bill

On Jan 24, 2017 9:30 AM, "Wang,Yu" <wangyu8722 at ufl.edu> wrote:

> To whom it may concern,
>
>
> I am trying to use this function wrf_user_ll_to_ij on a moving nested
> domain but found things problematic for moving nested domains. Here is the
> prototype of this function:
>
> 	function wrf_user_ll_to_ij (
> 		file_handle  : file or list [list added in V6.0.0],
> 		lon          : numeric,
> 		lat          : numeric,
> 		opt          : logical
> 	)
>
> The first statement is the file that needed to be handled. But for a
> nested domain output, each time step has a different domain region. Then
> how do we represent each time step for this first statement? For example. I
> have this file wrfout_d02_2005-08-20_18:00:00 which include 12-time steps
> . When I want to extract one certain point from all the time steps, how do
> I define the first statement?
> For example, if
>
> a = *addfile*("./wrfout_d02_2005-08-20_18:00:00.nc","r")
>
> for i=0,11
>
>   wrf_user_ll_to_ij(a(i), lon, lat, True)
>
> This way of extracting the ith time step of the output file is not correst. Then what should I do?
>
> Thanks forany help.
>
> Best,
>
> Yu Wang
>
>
>
>
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