spaAlign: Stratigraphic Plug Alignment for Integrating Plug-Based and XRF Data

Implements the Stratigraphic Plug Alignment (SPA) procedure for integrating sparsely sampled plug-based measurements (e.g., total organic carbon, porosity, mineralogy) with high-resolution X-ray fluorescence (XRF) geochemical data. SPA uses linear interpolation via the base approx() function with constrained extrapolation (rule = 1) to preserve stratigraphic order and avoid estimation beyond observed depths. The method aligns all datasets to a common depth grid, enabling high-resolution multivariate analysis and stratigraphic interpretation of core-based datasets such as those from the Utica and Point Pleasant formations. See R Core Team (2025) <https://stat.ethz.ch/R-manual/R-devel/library/stats/html/stats-package.html> and Omodolor (2025) <http://rave.ohiolink.edu/etdc/view?acc_num=case175262671767524> for methodological background and geological context.

Version:	0.0.6
Depends:	R (≥ 4.0)
Imports:	stats
Suggests:	testthat (≥ 3.0.0), knitr, rmarkdown
Published:	2026-01-08
DOI:	10.32614/CRAN.package.spaAlign
Author:	Hope E. Omodolor [aut, cre], Jeffrey M. Yarus [aut]
Maintainer:	Hope E. Omodolor <hopeomodolor at gmail.com>
License:	MIT + file LICENSE
NeedsCompilation:	no
CRAN checks:	spaAlign results

Documentation:

Downloads:

Linking:

Please use the canonical form https://CRAN.R-project.org/package=spaAlign to link to this page.