How to use interpolation?

I have longitude, latitude, the veolocity of sea surface and a buoy velocity

I want to know the relationship between sea surface velocity and buoy velocity

so i want to interpolate the velocity of sea surface using interp2

in this case how do i make the function?

[KSSV]

Is your sea surface velocity a 3D data?

[민준 배]

no it is 2D data

Answer 1

[KSSV]

Let lon,lat,U be your 2D data, and x,y,u be your buoy data.

Ui = interp2(lon,lat,U,x,y) ; 

If your data is #d (I hope it is), then run loop for each time step.

Other option is; get the index of nearest neightbour of (x,y) in (lon,lat) and extract U for this index.

[민준 배]

I did so but the error say its not the proper meshgrid

[민준 배]

lon and lat data is 1440*720 single and the U data is 1440*720 double

[KSSV]

Read about scatteredInterpolant or attach your data.