ggseg.formats

ggseg.formats provides the ggseg_atlas S3 class that powers the ggseg ecosystem for 2D and 3D brain visualisation. It ships three bundled atlases, a set of accessor functions for querying atlas contents, and a pipe-friendly manipulation API for subsetting, renaming, and enriching atlas objects.

Bundled atlases

The package includes three atlases covering the main atlas types:

• dk — Desikan-Killiany cortical parcellation (68 regions)
• aseg — FreeSurfer automatic subcortical segmentation
• tracula — TRACULA white matter tract atlas

library(ggseg.formats)

plot(dk())

plot(aseg())

plot(tracula())

Quick example

Atlas objects are designed for exploration and customisation. You can query regions, filter views, and pipe operations together:

aseg_small <- aseg() |>
  atlas_region_keep("hippocampus|amygdala|thalamus") |>
  atlas_view_keep("coronal_3|axial_3") |>
  atlas_view_gather()
plot(aseg_small)

Installation

Install from the ggsegverse r-universe:

options(repos = c(
    ggsegverse = 'https://ggsegverse.r-universe.dev',
    CRAN = 'https://cloud.r-project.org'))

install.packages('ggseg.formats')

Or install the development version from GitHub:

# install.packages("devtools")
devtools::install_github("ggseg/ggseg.formats")

Learn more

• vignette("ggseg.formats") — understanding atlas structure and accessors
• vignette("atlas-manipulation") — region, view, and metadata manipulation

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