How to find the closest point to lat/lon?

Hi all,

I have two grids grid 1 and grid 2, which I want to find the closest points of grid2 to the points in grid.

Both grids are in latitude and longitude.

I would appreciate your help as I am struggling.

[Jonas]

please support your question with the data attached as .mat

[John D'Errico]

Closest point in terms of true distance traveled along the surface (so the distance along a great circle?) Or simply a closest point in terms of some metric in degrees? The two would be different.