integration - Calculate the volume under a gridded surface in Matlab -


i have non-uniformly spaced x,y,z data (eastings, nothings , thickness) have gridded , plotted surface using meshgrid, griddata , surf.

i calculate volume under surface i'm struggling apply other answers question dataset , code in question (i complete matlab beginner).

any ideas how (on matlab version 2011b)? in advance.

load e.txt, load n.txt, load z.txt; [xi, yi] = meshgrid(25.351639:0.00025:25.426483, 36.363799:0.0005:36.458845); zi = griddata(e,n,z, xi,yi, 'linear'); surf(xi,yi,zi)

griddata interpolates data it's uniformly spaced on xi,yi,zi grid. sum zi values , multiply result base area, dx*dy:

dx = 0.00025; dy = 0.0005; vol = dx*dy*sum(zi(:));

if of zi values nan, instead:

vol = dx*dy*sum(zi(~isnan(zi)));

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