Users are free to distribute and modify the software provided that the original source and copyright are acknowledged in any modified version and that no attempt is made to pass off the derivative work as being the unmodified work of David Graham and Nicholas Midgley. Tri-plot, and all associated documentation, is copyright © 2003 David Graham and Nicholas Midgley. Tri-plot is made available free of charge subject to the condition that the original source (Graham and Midgley 2000) is referenced in all publications which utilise it.
The latest version (1.3) supports the plotting of the Sneed & Folk (1958) shape classes and user-defined isolines of the oblate-prolate (Dobkins & Folk 1970) and maximum-projection sphericity (Sneed & Folk 1958) indices. Because Tri-plot is implemented in Microsoft® Excel, it has a familiar user interface and data can be easily cut-and-pasted into it. Tri-plot provides a simple method of producing both conventional and Sneed & Folk triangular diagrams. Figure 1: The conventional triangular diagramįigure 2: The Sneed & Folk triangular diagram. Existing software is unable to plot these diagrams as the parameters on the three axes do not sum to 1. This scaling of the triangular diagram may also be used to represent sedimentary fabric shape (Benn 1994) and has potential application wherever the relationships between three independent variables are compared.
Numerous software packages are available for the production of such diagrams.Īn alternative type of triangular diagram was proposed by Sneed & Folk (1958) for the representation of particle shape (Fig. In the Earth Sciences, a common application is the representation of the proportions of sand, silt and clay in a sample. Tri-plot is a Microsoft® Excel spreadsheet for the preparation of triangular (ternary) diagrams for particle-shape and tri-variate data.Ĭonventional triangular diagrams are used to represent tri-variate data in which the three variables represent proportions of a whole (Fig. You are here: Resources Gateway home > Tri-plot Tri-plot
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