Mapping toolbox: irregular measured geo referenced data into regular grid
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Bjorn Gustavsson on 9 May 2022
"5m" sounds like a reasonably small region of data? If so, local topography might be more important than the curvature of Earth. Then you might use some local horizontal cartesian coordinates, or UTM, and use scatteredInterpolant, or griddata and then convert back to lat-long.
Come to think about it might can use scatteredInterpolant on the 3-D ECEF coordinates - though I'm not sure how well that would work.