Select four surrounding grid points
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I have the latitude and longitude location of a certain observation and a square latitude and longitude grid of model data. I need to calculate a bilinear interpolation of the 4 model grid points surrounding this observation to the observation. However I'm stuck on how to select these surrounding 4 grid points? Any ideas as to how I could do this in Matlab would be appreciated?
I've tried calculating the actual distance from the observation location and then selecting the 4 nearest points but I realised this doesn't necessarily select the 4 surrounding points.