Abstract

SCHMIDTMAC is a program to display orientation data on an equal-area projection. It has been developed in Pascal for use on a Apple Macintosh microcomputer; to make it user-friendly, extensive use has been made of the Macintosh graphic interface. It provides the main following facilities: (a) easy modification of a stereogram displayed on the screen, (b) possible identification (by clicking on a point, or by enclosing a group of points with a “lasso”) of displayed orientations, (c) calculation of orientation densities with a new grid, characterized by a variable number of nodes and apical angles of the counting cones, a net that allows variable smoothing of densities and “economic” counting and contouring algorithms, and (d) statistical estimations of, for example, the best axis or best plane for simple distributions, or automatic set-partitioning and the best axis of each set of more complex distributions.

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