A geometrically motivated parametric model in manifold estimation

Abstract

The general aim of manifold estimation is reconstructing, by statistical methods, an m-dimensional compact manifold S on ^d (with m≤d) or estimating some relevant quantities related to the geometric properties of S. Focussing on the cases d=2 and d=3, with m=d or m=d−1, we will assume that the data are given by the distances to S from points randomly chosen on a band surrounding S. The aim of this paper is to show that, if S belongs to a wide class of compact sets (which we call sets with polynomial volume), the proposed statistical model leads to a relatively simple parametric formulation. In this setup, standard methodologies (method of moments, maximum likelihood) can be used to estimate some interesting geometric parameters, including curvatures and Euler characteristic. We will particularly focus on the estimation of the (d−1)-dimensional boundary measure (in Minkowski's sense) of S. It turns out, however, that the estimation problem is not straightforward since the standard estimators show a remarkably pathological behaviour: while they are consistent and asymptotically normal, their expectations are infinite. The theoretical and practical consequences of this fact are discussed in some detail.

Keywords:

• estimation of boundary length
• estimation of curvature
• distance to boundary
• volume function
• remote sensing

2010 AMS Subject Classifications::

• 62F10
• 62H35

Acknowledgements

We are very grateful for the comments and criticisms from an anonymous referee which led to a substantially improved version of this manuscript. This work has been partially supported by Spanish Grants MTM2010-17366 (authors José R. Berrendero, Antonio Cuevas and Ricardo Fraiman) and CCG10-UAM/ESP-5494 (authors José R. Berrendero and Antonio Cuevas).