6 papers
Linear-cost Polyharmonic Spline Interpolation of Arbitrary Degree
Christopher J. Geoga, Michael O'Neil
We introduce a simple and performant approach for rapidly and accurately performing polyharmonic spline (PHS) interpolation using a combination of the fast multipole method (FMM) f…
A Gaussian Process Model of 3D Udder Point Clouds for Teat Length Phenotyping in Dairy Cows
Maria E. Montes, João R. R. Doréa, Christopher J. Geoga
Phenotyping conformation traits is important for dairy cattle breeding and management. Although large-scale phenotyping is possible with 3D imaging technologies, manual annotation…
Fast and accurate conditioning for large-scale Gaussian process prediction problems
Samanyu Arora, Christopher J. Geoga
Gaussian Process (GP) models provide a flexible framework for prediction and uncertainty quantification. For most covariance functions, however, exact GP prediction with points…
High-Resolution Retrieval of Atmospheric Boundary Layers with Nonstationary Gaussian Processes
Haoran Xiong, Paytsar Muradyan, Christopher J. Geoga
The atmospheric boundary layer (ABL) plays a critical role in governing turbulent exchanges of momentum, heat moisture, and trace gases between the Earth's surface and the free atm…
Fast nonparametric spectral density estimation from irregularly sampled data
Christopher J. Geoga, Paul G. Beckman
We introduce a nonparametric spectral density estimator for continuous-time and continuous-space processes measured at fully irregular locations. Our estimator is constructed using…
Fast Machine-Precision Spectral Likelihoods for Stationary Time Series
Christopher J. Geoga
We provide in this work an algorithm for approximating a very broad class of symmetric Toeplitz matrices to machine precision in time with applications to f…