gdi: Volumetric Analysis using Graphic Double Integration

Tools implementing an automated version of the graphic double integration technique (GDI) for volume implementation, and some other related utilities for paleontological image-analysis. GDI was first employed by Jerison (1973) <ISBN:9780323141086> and Hurlburt (1999) <doi:10.1080/02724634.1999.10011145> and is primarily used for volume or mass estimation of (extinct) animals. The package 'gdi' aims to make this technique as convenient and versatile as possible. The core functions of 'gdi' provide utilities for automatically measuring diameters from digital silhouettes provided as image files and calculating volume via graphic double integration with simple elliptical, superelliptical (following Motani 2001 <doi:10.1666/0094-8373(2001)027%3C0735:EBMFST%3E2.0.CO;2>) or complex cross-sectional models. Additionally, the package provides functions for estimating the center of mass position (COM), the moment of inertia (I) for 3D shapes and the second moment of area (Ix, Iy, Iz) of 2D cross-sections, as well as for visualization of results.

Version: 1.6.0
Depends: jpeg, png
Suggests: knitr, rmarkdown, testthat (≥ 3.0.0)
Published: 2024-04-21
DOI: 10.32614/CRAN.package.gdi
Author: Darius Nau [aut, cre]
Maintainer: Darius Nau <dariusnau at>
License: GPL (≥ 3)
NeedsCompilation: no
Materials: NEWS
CRAN checks: gdi results


Reference manual: gdi.pdf
Vignettes: Estimating Center of Mass
Miscellaneous Applications


Package source: gdi_1.6.0.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
macOS binaries: r-release (arm64): gdi_1.6.0.tgz, r-oldrel (arm64): gdi_1.6.0.tgz, r-release (x86_64): gdi_1.6.0.tgz, r-oldrel (x86_64): gdi_1.6.0.tgz
Old sources: gdi archive


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