Projecting planar structures on a map: a frequent problem
Abstract
The main objective of a geologic map is to show a realistic graphic representation of the spatial distribution of rock-units and structures occurring in the study area, for further integration in a chronologic sequence of events. Maps are the capstone of geologic studies of diverse nature and goals. In this work, the trace of contours of plane structures projected on a map is posed as a problem commonly faced by field geologists and that it may imprint a high degree of uncertainties on the final product. Solutions discussed here are based on Euclidian and descriptive geometry and structures from the eastern sector of the Sierra de Pachuca were used as working examples. Additionally, it is emphasized that hand-drafting of the contours on the sketch map is a critical stage of geological mapping, independently of the digital means used to generate the map in its final version, and that is fundamentally required to submit the map to a successive “ground-truth” process.
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