Package

r-interp

Description

Interpolation Methods. Bivariate data interpolation on regular and
irregular grids, either linear or using splines are the main part of
this package. It is intended to provide FOSS replacement functions for
the ACM licensed akima::interp and tripack::tri.mesh functions. Linear
interpolation is implemented in interp::interp(..., method="linear"),
this corresponds to the call akima::interp(..., linear=TRUE) which is
the default setting and covers most of akima::interp use cases in
depending packages. A re-implementation of Akimas irregular grid spline
interpolation (akima::interp(..., linear=FALSE)) is now also available
via interp::interp(..., method="akima"). Estimators for partial
derivatives are now also available in interp::locpoly(), these are a
prerequisite for the spline interpolation. The basic part is a GPLed
triangulation algorithm (sweep hull algorithm by David Sinclair)
providing the starting point for the irregular grid interpolator. As
side effect this algorithm is also used to provide replacements for
almost all functions of the tripack package which also suffers from the
same ACM license restrictions. All functions are designed to be backward
compatible with their akima / tripack counterparts.

Note