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Abstract:Although the systems approach to design is usually thought of as having applications only in the field of hardware systems design, from whence it came, systems methodology and philosophy are also applicable to the design of computer software systems. The NGI (Numeric Ground Image) Systems Design study is an example of the systems approach to the design of a computer software system. The NGI System furnishes the highway engineer with a method for approximating the terrain. surface with a numerical surface. Traditional highway design practice has required the use of cross-sections to represent the terrain. The use of the numerical surface approach, instead of the cross-section method, eliminates some terrain representation problems associated with the traditional cross-section method. For example, if the horizontal alignment of a roadway is shifted, a new and separate set of cross-sections corresponding to the new alignment must he obtained. This new set of cross-sections is necessary because the old set was directly referenced to the old alignment. This is not true of the numerical surface approach because it is not directly referenced to any specific alignment.
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