Integrate a grid?

Hi,

So my “RDF” works and I have a new estimate of the global Heat Flux using Goutorbe's method  and “attributes” in a new way. Cool, but this is Watts/m^2, and everyone wants to know what the total heat flux from the core/mantle is.

I simply need to “integrate my grid over area”.

While it is possible to make the “area of each node” grid as described here by Paul and Joaquim a few years ago,

	http://comments.gmane.org/gmane.comp.gis.gmt.user/18770


I’m wondering if there is a new and improved new tool from the GMT 5, (or possibly a “trick”) that does “integrals” of all sorts: 

	one D, area, volume

	line, contour, etc, etc,


Thanks,

JJ

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