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Re: Unable to get GRIDDATA Function to Work Properly [message #77225 is a reply to message #77216]

Tue, 16 August 2011 09:32

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On 8/15/11 10:01 PM, Jon wrote:
> Hello IDL'ers
>
> I'm trying to do some interpolation with the GRIDDATA function.
>
> I have a regular lon/lat grid spanning the globe, consisting of values
> that are either 0 or 1. I am trying to interpolate these values to an
> irregular lon/lat grid spanning much of the U.S.
>
> Trouble is, no matter what I do, I cannot get the routine to give me a
> 1, where they clearly should exist. For a simple example, on my global
> grid, all points surrounding -115 W, 35 N are 1, but when I run (where
> testGrid is my global grid):
>
> myGrid = GRIDDATA(Lon, Lat, testGrid, /GRID, XOUT=[-115.0],
> YOUT=[35.0])
>
> I get a 0. Shouldn't this routine interpolate a value of 1 at this
> point?
>
> Thanks,
> JonR

I haven't done it, but based on the help page I'd guess that you might
want to use /SPHERE and /DEGREE.

-Jeremy.

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[Message index]

		Re: Unable to get GRIDDATA Function to Work Properly By: Klemen on Wed, 17 August 2011 04:40
		Re: Unable to get GRIDDATA Function to Work Properly By: Jon on Tue, 16 August 2011 17:29
		Re: Unable to get GRIDDATA Function to Work Properly By: Jeremy Bailin on Tue, 16 August 2011 09:32

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