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Re: interpolation question [message #48486 is a reply to message #48393]

Thu, 20 April 2006 12:26

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

chen123.dian@gmail.com wrote:
> Thanks, Peter,
>
> Your code works well for 1-D data. It will be nice to extend it to 2-D
> data.

The key to solving your problem is locating the points of your output
grid in the "index space" of your input grid. There are routines to do
this in the Motley library:

http://www.dfanning.com/hadfield/idl/README.html

They are called MGH_LOCATE and MGH_LOCATE2, for 1D and 2D respectively.
(The 1D version uses the INTERPOL trick suggested by Peter.) Their use
was discussed on the group recently in a couple of threads entitled
"Interpolating a regular grid" and "matching 2 grids". See

http://tinyurl.com/r9t5s
http://tinyurl.com/fherp

--
Mark Hadfield "Kei puwaha te tai nei, Hoea tahi tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Interpolation question By: rkj on Wed, 25 July 2001 11:18
		Re: interpolation question By: chen123.dian on Thu, 20 April 2006 07:50
		Re: interpolation question By: Mark Hadfield on Thu, 20 April 2006 12:26
		Re: interpolation question By: peter.albert@gmx.de on Thu, 20 April 2006 08:47
		Re: interpolation question By: peter.albert@gmx.de on Thu, 20 April 2006 01:20
		Re: interpolation question By: news.verizon.net on Mon, 24 April 2006 12:47
		Re: interpolation question By: Paul Van Delst[1] on Mon, 24 April 2006 12:09
		Re: interpolation question By: Jo Klein on Mon, 24 April 2006 12:04
		Re: interpolation question By: chen123.dian on Mon, 24 April 2006 11:35
		Re: Interpolation question By: mchinand on Thu, 03 August 2006 09:01
		file_lines and expand path By: FL on Fri, 04 August 2006 08:23
		Re: Interpolation question By: greg michael on Thu, 03 August 2006 04:04
		Re: Interpolation question By: Mike Wallace on Wed, 02 August 2006 13:34
		Re: Interpolation question By: JD Smith on Wed, 02 August 2006 09:31
		Re: Interpolation question By: mchinand on Wed, 02 August 2006 09:37

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