Interpolate data on a single point

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Andrew Goenner 2017-8-7

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回答： Chad Greene 2017-8-10

Hello All

I want to bilinearly interpolate some data that is occurring on one point in space. I have four files (939x1129 grid points) that all have the same coordinates and I want to find out where a certain percentage will occur on each of the grid points. Each grid point as four values:lat and lon(unneeded for this problem), rainfall amount(inches) and the probability(%) of that rainfall amount falling at that location.

(Rainfall amount, percent) (.5, 94%) (1, 87%) (1.5, 36%) (2, 10%)

What I need to find is the amount of rainfall that will match with two different probability (R1,5%) and (R2, 95%). I have been looking at interp2 and griddata but both seems to require a function input to work, which I don't have.

Andrew

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Answer 1

Chad Greene 2017-8-10

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Hi Andrew,

Your question is a little bit unclear. It would helpful to have a minimal working example, but from what I understand, I don't think you need to interpolate anything, and griddata is not necessary, as your matrices are already gridded.

For a rainfall matrix R with corresponding probabilities P, you can get a logical mask of all the grid points meeting a condition like

mask = P>=0.05 &P<0.10;

which would have ones wherever P is between 0.05 and 0.10, and zeros elsewhere. Then the corresponding rainfall in those grid cells is

R(mask)