Contouring high resolution complicated fields

From: R. T. Pierrehumbert <rtp1_at_nyahnyahspammersnyahnyah>
Date: Wed, 16 Feb 2005 22:21:34 -0600

I routinely need to do 2D shaded maps of tracer fields (like water
vapor) which
have a lot of fine-scale structure. If I do an ngl.contour(...) (color
fill on) of
a 120x400 field which is spatially simple, it's no problem. However,
if the field has a lot of fine scale structure -- thin filaments, what
have you, --
it takes so long that it's unusable. I think this is probably because
generates a polygon for each region to be filled, and the perimeters
can get exponentially large in cases like I'm doing.

Is there any way to do a fast color-shaded map of a high resolution
complicated field? I don't need contour lines.Color fill by itself
is good enough.

The same field plots fine in Matlab (contourf) or in vcs, so I imagine
these packages are using a different algorithm to generate the map.


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Received on Wed Feb 16 2005 - 21:21:34 MST

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