How to shift data in a 3D plot?

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Hi,

I have 2 plots, a Prescan and a Postscan, each generated from 65536 (256x256) surface z-coordinates. I used surf and Matlab automatically generate 3D plot. The X- and Y values are 1-256.

Now I would like to substract the Prescan from the Postscan to determine the wear volume. But there is an offset between both scans and therefore I need to shift every Postscan data by Y=-1. Do you know how to do this?

I tried to remove the first row and column of the Postscan data. But if I do this, I cant substract Post- and Prescsan, because they have a different size.

I attached a picture of the problem. This pictures shows the top view of what happens, when I overlay both scans with the hold command. You can see in the 4 circles, there is an offset between the Prescan (blue point) and Postscan (yellow point). They have to be at the same position.