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weighting: irregular grid [message #62340]

Fri, 05 September 2008 08:23

astroboy2k
Messages: 34
Registered: July 2007

Member

Hello.

I'm sure someone has come up with code to do this, so rather than re-
invent the wheel:

I have a dataset: f(x,y),x,y, where the x and y grids are somewhat
irregular. I can use trigrid and triangulate to get an image of f, of
course, but what I really need is f weighted by the area each data
point occupies.

One can define the area that a data point occupies by drawing lines
perpendicular to the line connecting the point with neighboring
points: eventually one will have some sort of polygon enclosing the
point. One can then weight the f-value by the area of the polygon.
Something like this would work very well for me.

Does anyone know of code that accomplishes something like this before
I kill a day or two trying to write it myself? No doubt IDL has a
canned routine that does this but I haven't been able to find it....

Thanks very much,

Mark

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By: astroboy2k on Fri, 05 September 2008 08:23

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