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    Author(s): Elliot L. Amidon; E. Joyce Dye
    Date: 1978
    Source: General Technical Report PSW-025. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 11 p.
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (568 KB)

    Description

    Two mechanical devices that are mainly used to print computer output in text form can simulate pictures of terrain and forests. The line printer, which is available for batch processing at many computer installations, can approximate halftones by using overstruck characters to produce successively larger "dots." The printer/plotter, which is normally used as an interactive terminal, permits fine adjustment of the space between characters in the plot mode. This control over blank space improves tonal appearance and permits solid black. The two types of printers have complementary uses. The line printer is best for high volumes of data, while the slower printer/plotter offers a greater range of densities.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Amidon, Elliot L.; Dye, E. Joyce. 1978. Simulating forest pictures by impact printers. General Technical Report PSW-025. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 11 p.

    Keywords

    Mapping systems, computer simulation, pattern recognition, impact printers, grey scale

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