v2.3

Release for CRAN, aqp version 2.3, published 2026-01-17.

Major Changes

• aqp now requires R >= 4.1
• stringr package removed from imports (#331) (@dylanbeaudette, @brownag)
• updated CIELAB and sRGB color coordinates for Munsell neutral chips, based on direct measurement (#332) (@dylanbeaudette)
• added estimated spectra for Munsell neutral chips (#332) (@dylanbeaudette)

New Functions

• new function mu_confusion_matrix() (@smroecker)
• new function colorVariation() for describing color variation in terms of average human color perception (@dylanbeaudette)
• new function shuffle() for re-ordering horizon data or horizons within a SoilProfileCollection object (#328) (@dylanbeaudette)
• .detectColorSpec() is a new internal function for detecting a color specification (@dylanbeaudette)

Enhancements

• colorContrast() will now compute contrast data for pair-wise combinations of m1 when m2 is not specified (#330) (@dylanbeaudette)
• plotProfileDendrogram() gets better default arguments for scaling, offset, etc. (@dylanbeaudette)
• warpHorizons() gains scaleTo argument for scaling profiles to specific soil depth (@dylanbeaudette, thanks to @swsalley for ideas)
• electroStatics_1D() now accepts vector of charge density q or single value (original implementation) (@dylanbeaudette)
• estimateSoilColor() transformation parameters updated (@dylanbeaudette)
• spc2mpspline() gains ability to process multiple variables in one call. Requires mpspline2 (>=0.1.9) (@brownag)

Enhancement + Possibly Breaking Changes

• soilColorSignature() (#335) (@dylanbeaudette):
  • gains generalized color specification via new arguments color and space
  • new argument to control development of a perceptual distance matrix: perceptualDistMat = TRUE
  • deprecated arguments r, g, b, RescaleLightnessBy, warning issued until the next major release