Question: 3d surface approximation

I've a 3d surface built by the point's set;

It looks like this:

 

The question is:

1. how to build a surface based on this data?

2. how to define whether the arbitrary point (x,y,z) is inside this surface or not?

 

the Maple file is included, thank you in advance! 

LC_for_MP.mw

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