Why 'explode mesh' will make the total area larger?

Dear all,
Hope you all are well at the special period!
I encounter a quite wried issue. I’m computing the green space area with slope. I found when I compute the area of green space with the ‘Area’ component directly, the result is different from the sum area after the mesh exploded. And the area is always less than the sum area. Is there anything wrong I did? Pls help me have a look. Thanks.

Area_Computing.gh (136.4 KB)

It looks like an issue of being too far from the origin. If you move the mesh closer to 0,0,0, you get better results.


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Many thanks. Yes, I tested. When I move the mesh closer to the original, the result would be more exact.