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contouring irregular sparse data on a sphere [message #47991]

Thu, 09 March 2006 00:02

sarah.arnup
Messages: 1
Registered: March 2006

Junior Member

Hello all,

I am trying to contour an irregularly spaced variable (data) that
contains a number of missing values (NaN).

It is a 1-D array, and I also have the corresponding lat and lon 1-D
arrays.

When I try:
contour, data,lon,lat, /irr
I see many disjointed sections. I would like these to be continuous.

I am using version IDL Version 6.0.

I have tried: min_curve_surf; and triangulate+trigrid on a sphere; but
each function provides me with an array of NaN. Can these routines
work with arrays containing many NaN values? Does anyone know of a
spherical interpolation routine that can cope with NaN?

Curiously min_curve_surf doesn't recognise the /sphere keyword with my
version of IDL. I find this strange.

Thanks, Sarah

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