Combining Multiple Geophysical Data Sets Into A Single 3D Image

Abstract

Traditional geophysical interpretations of multiple data sets have been carried out by interpreting the data on an individual basis and painstaking comparison of the overlapping registration of anomalies on different types of data. This paper illustrates a visualization approach to combining multiple data sets. The individual data sets can consist of any quantified data on a two dimensional (2D) grid (e.g., EM, gravity, magnetics, digital coded geology, topographic maps, model responses, etc.), or three dimensional time-dependent data (e.g., seismic, or GPR). The approach is based on computer software that automatically registers the coordinates of the data sets to the same base map. The interpreter then assigns a vertical position in a 3D block and a color scale to each individual data set. The resulting 3D block is displayed on the screen for further manipulation of opacity and color scales to provide an optimum image for the interpretation of the fused data sets. The interactive interpretation phase is further enhanced with an ability to generate cross section slices and smaller 3D blocks that highlight individual anomalies. Multiple data sets that are handled in this manner provide the interpreter with the optimum environment for visual comparison and interpretation of diverse and complex data sets. One of the keys to the interpretation of multiple data sets is the ability to manipulate both the color assignments and the opacity so that individual features can easily be seen from one data set to the other. In addition, the digital display must be completely interactive to allow interactive control of the color, the opacity, and the view. A good interactive display also allows the interpreter to easily select and switch between block views or slices, with the capability to view a small portion of the block. In short, the interpreter needs to have full control of the 3D block of data to change any display parameter. The final display is the interpretation.