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Re: resampling on irregular grid [message #80380]

Fri, 08 June 2012 06:00

natha
Messages: 482
Registered: October 2007

Senior Member

When I re-sampling grids I normally use nearest neighbour interpolation. I create a matrix with the "projection" indices.
Something like :

FOR i=0l, N_ELEMENTS(lon_cart)-1 DO BEGIN

diff=(lon1-lon_cart[i])^2.+(lat1-lat_cart[i])^2.
min_latlon=MIN(diff,pos)

IF min_latlon LE tol THEN BEGIN
cart_xindex[i]=(pos MOD nlon)
cart_yindex[i]=(pos / nlon) + yy_ini
ENDIF
ENDFOR

This loop normally takes a lot of time but if one of your grids is regular you can improve it.
Hope this will help !

nata

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[Message index]

		Re: resampling on irregular grid By: natha on Fri, 08 June 2012 06:00
		Re: resampling on irregular grid By: Fabzi on Fri, 08 June 2012 04:18
		Re: resampling on irregular grid By: Thibault Garel on Thu, 07 June 2012 21:38
		Re: resampling on irregular grid By: wlandsman on Thu, 07 June 2012 20:52
		Re: resampling on irregular grid By: Thibault Garel on Thu, 07 June 2012 19:16
		Re: resampling on irregular grid By: Fabzi on Thu, 07 June 2012 03:53

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