[R] Finding local maxima (height) in a matrix data (6 spatial coordinates)?

[Josep Maria Campanera Alsina]

Dear all,
I wonder which R algorithm could perform a search of local maxima in
an spatial grid, in other words, having the coordinates of a map
(x,y,z... up to 6 coordinates) and then the altitude/height at each
point (h) (in total 7 numerical variables) I would like to localise
the peaks (local maxima) of that topological surface. Which R
algorithm can perform this?

Thanks a lot,

Josep Maria,