GMT 4: combining GRD files into one FILE with several LAYERS

I have 256 global grids at 15 second resolution; e.g. ~16 GB grd files * 256 grids =  4 TB of data.

I want to automate some processing that uses tiny patches (16x16 nodes) of each and every one of these 256 files. And I step that over the globe.

Off hand it seems like it might make sense (code re-use and simplicity) to combine all that data into a single grid with 256 layers.

Is this practical? 

Anyone have some examples of doing things like this:

	grdmath on layer "a" writing result to layer "b"

	grdmask xy files > "layer"

and so on.

thanks!


-jj

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