A computer system for handling digitized line data from geological maps

A system is described in which digitized line data, such as the boundaries shown on a geological map, are handled within existing software environments for data management and display. Methods of preprocessing and interfacing are described, which were implemented with less software effort than would be needed for a specialized cartographic system. The methods may not be appropriate for high-precision production cartography, but provide a flexible method of meeting two objectives: in the short run, to extend existing computer plotting programs to include digitized lines; in the longer run, to gain experience with techniques for representing and describing geological maps in digital form. A structure of line-segment files is proving effective for these purposes. By separating the three functions of data recording, storage and display, which are combined inextricably in the traditional geological map, computer methods may provide increased flexibility for recording geological data observed in the field.