Re: Fwd: interpolation gridded data to rcm

Hello,

Thanks Dennis for your suggestion. However I believe the function "triple2grid2d" places randomly-spaced data onto the nearest locations of a grid instead of interpolation while I need to do a interpolation. I also checked http://www.ncl.ucar.edu/Document/Functions/regrid.shtml but did not find any function that can interpolate randomly-spaced data to another randomly-spaced data or RCMs grid.

Therefore, I would like to know is there any function or any way in NCL to interpolate 2d randomly-spaced data to another 2d randomly-spaced data or 2d randomly spaced data to directly RCMs grid.

Any help in this regard will be appreciated and sorry for any inconvenience

Thanks

Debasish

On 2011-02-03, at 14:36, Dennis Shea wrote:

> NCL does not read Excel spradsheeys.
> You would have to convert to ascii, the use asciiread.
>
> "natvar" is high quality but is known to be slow.
>
> Really, if you have a large number of high res\
> grids you need interpolated to an RCM grid,
> there is not magic bullet. it will take time.
>
> The following *may* be useful.
>
>
> http://www.ncl.ucar.edu/Document/Functions/Built-in/triple2grid2d.shtml
>
> Good luck
>
> On 2/3/11 12:02 PM, Debasish wrote:
>> Dear NCL Users
>>
>> I guess I am getting missing outputs because of the assumption that xin
>> is gridded RCM data because neither lon proceeds left to right nor lat
>> proceeds from south-to-north.
>>
>> I have tried to use "natgrid" assuming xi (mxn) with lat(mxn) and
>> lon(mxn) but the program is hang. I guess it does not work too.
>>
>> Therefore, I would like to know how do I interpolate this data (high
>> resolution data) to RCM grid with lat2d(172,180), lon2d(172,180).
>> Meanwhile I counted that there are nearly 450 RCM grid over the input
>> domain; so I would like to interpolate the input data to this 450 CRCM
>> grid.
>> I am sending the part (total file has 17536 lat, lon and xin) of lat and
>> lon of the input data for your convenience .
>>
>> Any help in this regard will be appreciated
>>
>> Thanks
>>
>> Debasish
>>
>> =
>>
>>
>>
>> Begin forwarded message:
>>
>>> *From: *Debasish <debasish@sca.uqam.ca <mailto:debasish@sca.uqam.ca>>
>>> *Date: *1 février 2011 16:42:48 HNE
>>> *To: *Ncl Talk <ncl-talk@ucar.edu <mailto:ncl-talk@ucar.edu>>
>>> *Subject: **[ncl-talk] interpolation gridded data to rcm*
>>>
>>> Dear NCL users,
>>>
>>> I have gridded data xin (m,n) with lat(m,n) and lon(m,n) for smaller
>>> domain. I would like to interpolate the data to RCM grid lat2d(a,b)
>>> and lon2d(a,b) for bigger domian.
>>> I follow the followings steps:
>>>
>>> 1. I assume "xin" as RCM gridded data
>>> 2. convert lat2d and lon2d to 1d array lat1d and lon1d
>>> 3. Use "rcm2points" function
>>> xout1d = rcm2points(lat,lon,xin,lat1d,lon1d,0)
>>> 4. then convert xout1d to 2d
>>> but all the values of xout1d are missing
>>>
>>> Any suggestion to fix these problem will be appreciated
>>>
>>> Thanks
>>>
>>> Debasish
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>> =
>>
>>
>>
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Received on Mon Feb 7 10:03:10 2011