selecting lowest points of a point cloud for surface modelling

[AydinAbar1]

Hello everybody,

Being new to the forum and hope that I'm placing my question at the right place. I have a number of points (ca. 2000) with x/y/z coordinates, which are archaeological finds coming from an artificially filled basin. I would like to reconstruct the inner surface of the basin.

Can anybody tell me, if there is a way to calculate a hull, based on the points being positioned on the outskirts of the point cloud and then to cut away the upper part of the hull, producing an approximation of the basin?

Cheers,

Archeohorst

[DanPatterson_Retired]

An image would help.

When you mean hull, are you looking for some kind of 3d convex hull (no tools currently exist) or are you using the term in a general context.  Perhaps the statistical properties of the data set could be exploited if the site definitely represents  the area.  An artificially filled location might represent smaller variations in elvations than the surrounding area, for instance, but a picture would help