Exploration with a computer : geoscience data analysis by William R. Green

By William R. Green

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Selection might be done interactively, by drawing the polygon directly over a display on the screen. Other Types of Graphical Display Although maps of various forms are the usual graphical format in exploration data analysis, some other forms are also widely used for specific types of data. Examples of many of these will be given in later chapters. Most cases of departure from the map format are for studying data that do not have two spatial coordinates. When there is a single coordinate, the data variable (or variables) generally are plotted in a profile form, with the horizontal axis representing the coordinate, and the vertical axis the data value.

In other words, the data are not distributed completely randomly in space. While this assumption may be a fairly large one, and not easily proven, it is essential to the exploration process itself. Recall that the goal of exploration is to define a region containing an economic resource. From past history we know that such regions are always localized (resources are not uniformly spread throughout the Earth). The definition of a region then depends on recognizing some type of characteristic that is generally different within the region when compared to the surrounding barren ground.

When dealing with frames of reference other than conventional maps, the X-Y coordinates may not be permanent or measured values. Characteristics of Spatial Data 2 7 In plotting cross-sections for various surface traces, theXaxis is usually the distance along the line, which obviously is different for each crosssection. If the section is a projection onto an oblique plane, the Y coordinate probably will also be calculated independently for each section. This is a fairly common situation in mineral exploration, where mineralization is confined to some tabular body such as a fault zone or vein.

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