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Re: CONTOUR and automatic gridding of irregularly spaced data [message #85034 is a reply to message #85024]

Tue, 25 June 2013 00:12

Karlo Janos
Messages: 31
Registered: July 2008

Member

> Let's just say you are not the first to be thrown upon the shoals of
> disappointment. ;-)
>
> Cheers,
>
> David
>
> P.S. What's wrong with gridding the data yourself? God knows, if you do,
> it is one less thing to go wrong.
>

Thanks for your encouraging reply. ;-)
Well, what I _really_ want is a cell filled CONTOUR plot of the coloured
Voronoi cells which result from the (manual or automatic) gridding.
Apparently I have failed to use QHULL properly.

The following code avoids the gap between -180° and +180°:

rresult = SPH_SCAT( lons, lats, data, BOUNDS=[-180., -90., 180., 90.],
GS=[360./N_lons, 180./N_lats] )

cc = CONTOUR( rresult $
, DINDGEN(N_lons+1)/N_lons*360-180 $
, DINDGEN(N_lats+1)/N_lats*180-90 $
, /FILL $
, GRID_UNITS=2 $
)

But the grid is spaced equally in longitudes and latitudes. It is not a
real plot of the Voronoi cells based on the data coordinates.

Can you suggest an approach?

Thanks and regards

Karlo

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[Message index]

		CONTOUR and automatic gridding of irregularly spaced data By: Karlo Janos on Mon, 24 June 2013 06:10
		Re: CONTOUR and automatic gridding of irregularly spaced data By: David Fanning on Mon, 24 June 2013 06:21
		Re: CONTOUR and automatic gridding of irregularly spaced data By: Karlo Janos on Tue, 25 June 2013 00:12
		Re: CONTOUR and automatic gridding of irregularly spaced data By: David Fanning on Tue, 25 June 2013 05:03
		Re: CONTOUR and automatic gridding of irregularly spaced data By: Karlo Janos on Tue, 25 June 2013 06:24

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