intkrige: A Numerical Implementation of Interval-Valued Kriging
An interval-valued extension of ordinary and simple kriging.
    Optimization of the function is based on a generalized interval distance.
    This creates a non-differentiable cost function that requires a
    differentiable approximation to the absolute value function. This
    differentiable approximation is optimized using a Newton-Raphson algorithm
    with a penalty function to impose the constraints. Analyses in the package
    are driven by the 'intsp' and 'intgrd' 
    classes, 
    which are interval-valued extensions of
    'SpatialPointsDataFrame' and 'SpatialPixelsDataFrame' respectively. 
    The package includes several wrappers to functions in the 
    'gstat' and 'sp' packages.
| Version: | 1.0.2 | 
| Depends: | R (≥ 3.5.0), sp (≥ 1.3-1), gstat, raster | 
| Imports: | Rcpp, Rdpack, methods, stats, utils | 
| LinkingTo: | Rcpp, RcppArmadillo | 
| Suggests: | doParallel, foreach, lattice, latticeExtra, grid, gridExtra, testthat, knitr, rmarkdown | 
| Published: | 2025-09-21 | 
| DOI: | 10.32614/CRAN.package.intkrige | 
| Author: | Brennan Bean [aut, cre] | 
| Maintainer: | Brennan Bean  <brennan.bean at usu.edu> | 
| License: | MIT + file LICENSE | 
| NeedsCompilation: | yes | 
| Materials: | README, NEWS | 
| CRAN checks: | intkrige results | 
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