# Re: Question of natgrid

From: Debasish <debasish_at_nyahnyahspammersnyahnyah>
Date: Mon May 16 2011 - 12:56:31 MDT

1. "linint2_points" is required monotonically increasing arrays for latitude and longitude, so you need to rearrange your data if your lat and lon are not monotonically increasing array.

2. fi is the grided input data with dimension latitude and longitude i,e, fi (nyixnxi) where, nyi is the dimension of latitude and nxi of the dimension of longitude

Thanks

Debasish

On 2011-05-16, at 14:15, wei chih chen wrote:

>
> Hi users,
> Thanks for your suggestion. I have two question of the variable in 'linint2_points'. First, it said x and y are a strictly monotonically increasing array. Does it mean than I need to rearrange my data by monotonically increasing first?
> Second, my fi is the value I want to interpolate. I don't understand what it means by that the two rightmost dimensions (nyi x nxi) are the dimensions to be used in the interpolation. Could you explain me how I should revise my fi to do the linint2_points. Thank you.
>
>
> On Mon, May 16, 2011 at 8:44 AM, <debasish@sca.uqam.ca> wrote:
> "natgrid" interpolates from 2D random data to get values on a rectangular
> output grid, therefore, if you like to interpolate to a grid with
> lat(nlat) and lon(mlon), then the output dimension should be nlatxmlon.
> But I believe you like to interpolate to arbitrarily specified coordinate
>
> Also check
> http://www.ncl.ucar.edu/Document/Functions/interp.shtml
> http://www.ncl.ucar.edu/Document/Functions/regrid.shtml
>
>
> Thanks
>
> Debasish
>
>
> > Hi users,
> > I have a question about natgrid interpolation. When I use natgrid to
> > interpolate, I give 100 new coordinates to interpolate. However, I got
> > 100X100 new value after interpolation. Could anyone please explain me why
> > I
> > get 10000 new values instead of 100 new values? My goal is interpolate 161
> > value with lat and lon to 45320 new coordinates. When I try to use 45320
> > new
> > coordinates in the script, the program will crash because of huge
> > calculation (45320x45320?). My new coordinates is irregularly spaced grid.
> > Thus, I have tried dspnt2 for interpolation, but the result is not
> > satisfying. Except dspnt2 and natgrid, could anyone please give me some
> > advice to process the interpolation? Thank you.
> >
> > --
> > Best regards
> > Wei-Chih
> > _______________________________________________
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>
>
>
>
>
> --
> Best regards
> Wei-Chih
>
>
>
>
> --
> Best regards
> Wei-Chih
>
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Received on Mon May 16 12:55:41 2011

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