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Re: extrapolation and gridding of data
| Re: extrapolation and gridding of data [message #2695] |
Tue, 16 August 1994 01:31 |
adorf
Messages: 4
Registered: August 1994
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Junior Member |
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In article <32nr09$igl@senator-bedfellow.MIT.EDU>, russell@athena.mit.edu
(Russell L Scott) wrote:
> Hello!
>
> I was trying to grid irregularly spaced data using triangulate and
trigrid. The
> problem is that IDL will not extrapolate beyond the triangularization
defined by
> the known values. So what we are looking for is a gridding routine that
uses a
> method like "1/r^2" to specify the grid point values. Is there a
routinue like
> this in the user functions???
>
> Thanks,
>
> Russ Scott
To me it seems what you are looking for is a sophisticated
interpolation/extrapolation method. In order to do a meaningful
inter-/extrapolation one has to make some assumptions about the continuous
function underlying the irregular samples one has at hand. Which
assumptions are you willing to make, e.g. bandlimitedness?
Hans-Martin Adorf
--
Hans-Martin Adorf
ST-ECF/ESO
Karl-Schwarzschild-Str. 2
D-85748 Garching b. Muenchen
Germany
Tel: +49-89-32006-261
Fax: +49-89-32006-480
Internet: adorf@eso.org
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