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Difficulty with Interpolation / FunctionInterpolation


I am trying to calculate the volume under a given topography.  The data 
I have is topographic lines with {x,y,z} coordinates that are not on any 
grid pattern.  I am trying to utilize Interpolation or 
FunctionInterpolation to create an InterpolatingFunction for use in 
NIntegration.  It seems that since the data points are not well arranged 
I get the following message:

Interpolation::"indim" : "  
  StyleBox[\"\"\", \"MT\"]  The coordinates do not lie on a structured 
tensor \
product grid "

Does anyone have suggestion as to how I could sort the data to get the 
Interpolation to work?





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