Simple pixel spacing is used to overlay point locations on a spatial grid, or a series of grids.
an xyz-list with matrix or array of masks
logical - is the mask to be queried separately for each time step?
A function, with one argument - a matrix of points - that returns a logical vector indicating the overlay of each point against the masks.
Very little error checking is done.
Michael D. Sumner
get.mask and related examples for creating and using
over for more general capabilities for overlays.
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