# Translations:Implementation of migration/24/en

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A raypath is a course along which wave energy propagates through the earth. In isotropic media, the raypath is perpendicular to the local wavefront. The raypath can be calculated using ray tracing. Let the point be either a source location or a receiver location. The subsurface volume is represented by a of depth points *D*. To minimize the amount of ray tracing, we first compute a traveltime table for every surface location, whether the location is a source point or a receiver point. In other words, for each surface location *P*, we compute the one-way traveltime from *P* to each depth point *D* in the grid. We put these one-way traveltimes into a table labeled by the surface location *P*.