By William R. Green
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Extra info for Exploration with a computer : geoscience data analysis applications
Many packages are available to provide the basics for almost any type of computer to act as a terminal when connected to another. This means that any typed characters are simply transmitted to the communications port (and on to the other computer), and all incoming transmissions from the other end are simply displayed on the screen. Control of the remote computer is taken over by the machine at the other end of the communications line. Simple terminal mode is fine if the link between computers is used only to receive or send short messages.
Many of the operations applied to time series are plotted in the same form as the original data, so that a primary requirement of a display program for one-dimensional data is that it can apply operations such as correlations, derivatives, polynomial fits, and others. Time-series methods (analytical and graphical) are not restricted to cases of data measured at fixed increments of time. The independent variable may be any unit of measurement. In exploration, the most likely alternate to time is linear distance along a sampling traverse (which could be a road, a cut line through a forest, a drillhole into the Earth, or an aircraft's flight path, among others).
Gridding digitized topographic contours may fail, for similar reasons: The density of points along each contour may be high, so that normal search procedures retrieve from only two adjacent contour lines. Gridding programs involving a two-stage process have been developed for these special cases. For digitized contours, this might involve first selecting a single contour level, and interpolating along it to reduce the data density, before a conventional two-dimensional search. 3 6 Requirements for Geoscience Data Analysis Many gridding programs allow several methods of actually computing the value.