Processing display AND interpretation

With the exception of metal detectors used for locating buried utilities, EM data must be displayed and interpreted. The level of sophistication varies from visual identification of anomalies on the data to more complex modeling and inversion to extract specific features from a buried object of interest. The following outlines these approaches to data preparation and interpretation.

6.5.1 Data Preparation and Processing

Assuming the interpreter has chosen the type of data to be displayed (e.g., phase, amplitude, ellip-ticity, etc.), EM data can be displayed effectively as profile lines or two-dimensional maps. A critical stage in the analysis and processing of geophysical data is their presentation in a manner that permits the analyst to obtain a comprehensive, integrated view of the data set. The use of contour maps is based on experience that indicates they are very useful in presenting the spatial and amplitude character of geophysical fields and subsurface features and their relationship to one another. Two-dimensional displays permit rapid visual identification of patterns, trends, gradients, and other characteristics of a three-dimensional field. In a similar manner, data observed in one dimension, along a linear or curvilinear transect, are displayed as profiles with the geophysical variable as the vertical component and the relative spatial position of the observation site as the horizontal axis. Machine processing and presentation of digital data, which is the norm, have opened up numerous

Color scale -48 200

Color scale -48 200

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