Re: question about interpolation

he inpute data are cyclic in longitude. The correct call is

test = linint2_points_Wrap(var&lon, var&lat, var, True, xPts, yPts, 0)

On 02/19/2010 06:51 PM, Dennis Shea wrote:
> The rcm2points function requires the data to be ordered
> south-to-north.
>
> The data from NCEP are N->S. Use NCl's syntax to reverse
> the latitude [::-1]
>
> Below, linint2_points is used. It is faster than rcm2points
>
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> begin
> nt = 0
> kl = 0
>
> fs1 = addfile("tmp.mon.mean.nc","r")
> var = fs1->tmp(nt,kl,::-1,:) ; make that latitudes S->N
> printVarSummary(var)
>
> yPts = (/20.5,20.5/)
> xPts = (/100.,100/)
> test = linint2_points_Wrap(var&lon, var&lat, var, False, xPts, yPts, 0)
> print(test)
> end
>
>
>
> Yang Gao wrote:
>> To whom it may concern:
>>
>> I am trying to interpolate the lat/lon from NCEP(2.5by 2.5 degree data)
>> to a certain location(let's say, 38.85N 77.04W), but it seemed it can
>> not do using rcm2points. The attachment includes the script. It seemed
>> that rcm2points can interpolate wrf grid for a certain location, but
>> when I interpolate the NCEP data, it always shows up value like
>> -9.96921e+36.
>>
>> Is there any requirement to interpolate using this function?
>>
>> I forgot attachment in last email, so I ask again.
>>
>> Thanks
>>
>> Yang
>>
>>
>>
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-- 
======================================================
Dennis J. Shea                  tel: 303-497-1361    |
P.O. Box 3000                   fax: 303-497-1333    |
Climate Analysis Section                             |
Climate & Global Dynamics Div.                       |
National Center for Atmospheric Research             |
Boulder, CO  80307                                   |
USA                        email: shea 'at' ucar.edu |
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